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The muscular arrangement of the apex of the heart.

Muscular Arrangement of the Apex of the Heart

The muscular arrangement of the apex of the heart.

The right auricle of a fetal heart (eight months).

Fetal Heart

The right auricle of a fetal heart (eight months).

The respiratory system. Labels: 1, larynx; 2, trachea; 3, right lung; 4, left lung; 5, heart.

Respiratory System

The respiratory system. Labels: 1, larynx; 2, trachea; 3, right lung; 4, left lung; 5, heart.

Transverse section of a rat embryo. Showing relation of the paraxial mesoderm of the head to the lateral plates, the commencement of the formation of the otic vesicles and hyomandibular clefts, and the relation of the primitive heart to the pericardium and foregut. Labels: EC., ectoderm; SoM., somatic mesoderm; SpM., splanchnic mesoderm.

Transverse Section of a Rat Embryo

Transverse section of a rat embryo. Showing relation of the paraxial mesoderm of the head to the lateral…

Rome is the capital city of Italy and Lazio, and is Italy's largest and most populous city, with more than 2.7 million residents, and a metropolitan area of almost 4 million inhabitants. It is located in the central-western portion of the Italian peninsula, on the Tiber river. Rome stands on top of more than two and a half thousand years of history, was once the largest city in the world and the center of Western civilization. Rome is still the heart of Christianity, being seat of the Roman Catholic Church which controls the Vatican City as its sovereign territory, an enclave of Rome.

General View of Rome

Rome is the capital city of Italy and Lazio, and is Italy's largest and most populous city, with more…

Whitehall is a road in Westminster in London, England. It is the main artery running north from Parliament Square, towards traditional Charing Cross, now at the southern end of Trafalgar Square and marked by the statue of Charles I, which is often regarded as the heart of London. Recognised as centre of HM Government, the road is lined with government departments/ministries; "Whitehall" is therefore also frequently used as a metonym for governmental administration, as well as being a geographic name for the surrounding district.

Whitehall in the Seventeenth Century

Whitehall is a road in Westminster in London, England. It is the main artery running north from Parliament…

An illustration of women walking away with the man who's heart they captured by hitting them with Cupid's arrow.

Valentine's Day

An illustration of women walking away with the man who's heart they captured by hitting them with Cupid's…

The constitution of the cardiac plexuses. Labels: Sy, cervical sympathetic cord; C.1, superior cervical ganglia; C.2, middle cervical ganglia; C.3, inferior cervical ganglia; Car.1, superior sympathetic branch; Car.2, middle sympathetic branch; Car.3, inferior cardiac sympathetic branch; Va, pneumogastric nerve; R.L, recurrent laryngeal nerve; s, superior cervical cardiact branch of vagus; i, inferior cardiac branch of vagus; D.C.P, deep cardiac plexus; S.C.P, superficial cardiac plexus, A.P.P, anterior pulmonary plexus; P.P.P, posterior pulmonary plexus; R.Car.P, right coronary plexus; L.Car.P, left coronary plexus; Art.Pul, pulmonary artery.

Cardiac Plexuses

The constitution of the cardiac plexuses. Labels: Sy, cervical sympathetic cord; C.1, superior cervical…

The cavities of the right auricle and right ventricle of the heart.

Auricle and Ventricle of the Heart

The cavities of the right auricle and right ventricle of the heart.

The bases of the ventricle of the heart, showing the auriculoventricular, aortic, and pulmonary orifices and their valves.

Ventricle of the Heart

The bases of the ventricle of the heart, showing the auriculoventricular, aortic, and pulmonary orifices…

Sagittal section through left shoulder, lung, and apex of the heart.

Sagittal Section Through Shoulder and Lung

Sagittal section through left shoulder, lung, and apex of the heart.

The abdominal and thoracic viscera of a five months fetus. The large liver and large size if its left lobe at this age should be noted.

Abdomen of Fetus

The abdominal and thoracic viscera of a five months fetus. The large liver and large size if its left…

Dissection of the spleen, liver, and kidneys from behind.

Spleen, Liver, and Kidneys

Dissection of the spleen, liver, and kidneys from behind.

Coca is a plant in the family Erythroxylaceae, native to north-western South America. The plant plays a significant role in traditional Andean culture. Coca leaves contain cocaine alkaloids, a basis for the drug cocaine, which is a powerful stimulant. Coca should not be confused with the similarly named South American cocoa bean from which chocolate is made. The plant resembles a blackthorn bush, and grows to a height of 2–3 m (7–10 ft). The branches are straight, and the leaves, which have a green tint, are thin, opaque, oval, and taper at the extremities. A marked characteristic of the leaf is an areolated portion bounded by two longitudinal curved lines, one line on each side of the midrib, and more conspicuous on the under face of the leaf. The flowers are small, and disposed in little clusters on short stalks; the corolla is composed of five yellowish-white petals, the anthers are heart-shaped, and the pistil consists of three carpels united to form a three-chambered ovary. The flowers mature into red berries.

Coca Flower

Coca is a plant in the family Erythroxylaceae, native to north-western South America. The plant plays…

Anterior part of the circulatory system of an annelid. The arrows indicate the direction of the flow. H, heart-like enlargement of the commissural vessel.

Circulatory System of an Annelid

Anterior part of the circulatory system of an annelid. The arrows indicate the direction of the flow.…

Circulatory and respiratory system of the crayfish. C-heart with three pairs of ostia; Ps, pericardium; Ac, cephalic aorta; A, ab, abdominal aorta; As, sternal artery. The arrows indicate the direction of the flow.

Circulatory and Respiratory System of a Crayfish

Circulatory and respiratory system of the crayfish. C-heart with three pairs of ostia; Ps, pericardium;…

Heart and blood vessels of the turtle. Ad, right auricle; As, left auricle; Ao.d, right arch of the aorta; Ao.s, left arch of the aorta; Ap, dorsal aorta; C, carotids; Ap, pulmonary arteries.

Heart and Blood Vessels of a Turtle

Heart and blood vessels of the turtle. Ad, right auricle; As, left auricle; Ao.d, right arch of the…

Diagram of the heart completely divided into right and left halves, and of a double (systematic and pulmonary) circulation. Ad, right auricie; Vcs, anterior vena cava; Vd, right ventricle; Ap, pulmonary artery; P, lung; Vp, pulmonary vein; As, left auricle; Vs, left ventricle; Ao, aorta; D, gut; L, liver; Vp, portal vein; Lv, hepatic vein.

Heart Divided into Left and Right Halves

Diagram of the heart completely divided into right and left halves, and of a double (systematic and…

"Diagram of structure of Scopionidae (most of the appendages removed). IV. to XX., fourth to twentieth somite; IV., basis of the pedipalpi or great claws; V., VI., of two succeeding cephalic segments; T, telson of sting; a, mouth; b, alimentary canal; c, anus; d, heart; e, a pulmonary sac; f, line of ventral ganglionated cord; g, cerebroganglia." -Whitney, 1911

Scorpion Diagram

"Diagram of structure of Scopionidae (most of the appendages removed). IV. to XX., fourth to twentieth…

The skeleton of an ox. Axial Skeleton. The skull. Cranial Bones- occipital, 1: b, parietal, 2; a, frontal, 2; c, temporal, 2; sphenoid, 1; ethmoid, 1; auditory ossicles, 8. Facial Bones- h, nasal, 2; e, lachrymal, 2; d, malar, 2; f, maxilla, 2; g, premaxilla, 1; i, inferior maxilla, 2; palatine, 2; pterygoid, 2; vomer, 1; turbinals, 4; hyoid series, 7. Teeth: incisors, 6; canines, 2; molars, 24. The trunk- k, cervical vertebrae, 7; l, dorsal vertebrae, 13; m, lumbar vertebrae, 6; n, sacrum ( five segments), 1; o, coccygal vertebrae (variable), 20; p, ribs, 26; * sternum (seven sternebrae), 1. Appendicular skeleton. Pectoral limb. t, scapula, 2; u, humerus, 2; v, radius, 2; w, ulna, 2. Carpus- x, trapezium, 2; y, cuneiform, 2; z, lunar; a', scaphoid, 2; b', unciform, 2; c', magnum, 2. Metacarpus: d', large bone, 2; e', small bone, 4; f', large sesamoids, 8. Digit- g', proximal phalanges, 4; h', median phalages, 4; i', distal phalanges, 4; k', small sesamoids, 4. Pelvic Limb. Pelvis- q, ilium, 2; s, ischium, 2; r, pubis, 2. The limb- l', femur, 2; m', patella, 2; n', tibia, 2. Tarsus-o', maleolar, 2; p', calcaneum, 2; q', astragalus, 2; r', cubocuneiform, 2; s', cuneiforme medium, 2; t', cuneiforme parvum, 2. Metatarsus: large bone, 2; u', small bone, 2. Large sesamoids, 8. Digit: proximal phalanges, 4; median phalanges, 4; distal phalanges, 4; small sesamoids, 4. Visceral skeleton. Bones of the heart, 2. The separate bones of the ruminant skeleton, as here considered are 251.

Ox Skeleton

The skeleton of an ox. Axial Skeleton. The skull. Cranial Bones- occipital, 1: b, parietal, 2; a, frontal,…

La Sainte-Chapelle (English: The Holy Chapel) is a Gothic chapel on the Île de la Cité in the heart of Paris, France. It is perhaps the high point of the full tide of the rayonnante period of Gothic architecture.

Plan of Sainte Chapelle, Paris

La Sainte-Chapelle (English: The Holy Chapel) is a Gothic chapel on the Île de la Cité…

The digestive apparatus of the horse. Labels: a, mouth; 2, pharynx; 3, esophagus; 4, diaphragm; 5, spleen; 6, stomach (left sac); 7, duodenum; 8, liver (upper extremity); 9, great colon; 10, caecum; 11, small intestine; 12, floating colon; 13, rectum; 14, anus; 15, left kidney and ureter; 16, bladder; 17, urethra; a, hard palate; b, tongue; c, soft palate; d, trachea; e, pulmonary artery (divided); f, heart; g, posterior aorta.

Digestive Apparatus of the Horse

The digestive apparatus of the horse. Labels: a, mouth; 2, pharynx; 3, esophagus; 4, diaphragm; 5, spleen;…

Most famous of the Buddhist caves is a chaitya hall (chandrashala) or 'Vishwakarma cave', popularly known as the 'Carpent Indiaer's Cave'. Beyond its multi-storeyed entry is a cathedral-like stupa hall also known as chaitya, whose ceiling has been carved to give the impression of wooden beams. At the heart of this cave is a 15 foot statue of Buddha seated in a preaching pose.

Buddhist Cave Temple at Ellora, Interior

Most famous of the Buddhist caves is a chaitya hall (chandrashala) or 'Vishwakarma cave', popularly…

Right side of the heart-laid open. Labels: 1, right ventricle; a, its external wall; b, carneae columnae; c, great moderator band; d, origin of pulmonary artery; e, sigmoid valves; 2, right auricle; a, foramina Thebesii and musculi pectinati; b, opening of anterior, and c, of posterior vena cava.

Heart of a Horse

Right side of the heart-laid open. Labels: 1, right ventricle; a, its external wall; b, carneae columnae;…

Left side of the heart-laid open. Labels: 1, left ventricle; a, its external wall; b, carneae columnae; c, moderator band; d, mitral valve; d', chordae tendineae; 2, left auricle; a, musculi pectinati; b, opening of pulmonary veins.

Heart of a Horse

Left side of the heart-laid open. Labels: 1, left ventricle; a, its external wall; b, carneae columnae;…

Muscular fibers from the heart of a horse.

Muscular Fibers from the Heart of a Horse

Muscular fibers from the heart of a horse.

Diagram of the circulation of the reptile. Labels: a, pulmonic, and b, somatic circulation; c, heart showing the three cavities. The arrows indicate the course of the blood current.

Circulation of a Reptile

Diagram of the circulation of the reptile. Labels: a, pulmonic, and b, somatic circulation; c, heart…

Diagram of the circulation of the fish. Labels: a, branchial circulation; b, somatic circulation; c, heart; d, auricle; e, ventricle; f, arterial trunk.

Circulation of a Fish

Diagram of the circulation of the fish. Labels: a, branchial circulation; b, somatic circulation; c,…

Diagram of the circulation in a crustacean. Labels: a, branchial; b, somatic circulation. On the right side is the heart with is single cavity, and on the left the venous lacunae.

Circulation of a Crustacean

Diagram of the circulation in a crustacean. Labels: a, branchial; b, somatic circulation. On the right…

The human thoracic viscera.

Thoracic Viscera

The human thoracic viscera.

Cavities of the right side of the heart.

Heart Cavities

Cavities of the right side of the heart.

The Heart Urchin (Echinocardium cordatum) is sea urchin in the Loveniidae family.

Heart Urchin

The Heart Urchin (Echinocardium cordatum) is sea urchin in the Loveniidae family.

"Early Human Embryo, giving diagrammatically the principal vessels antecedent to the establishment of the regular fetal circulation. H, heart; P, lungs; L, liver; T A, the aortic trunk or cardiac aorta; c, c', c", common, external, and internal carotids; s, subclavian artery; v, vertebral artery; 1, 2, 3, 4, 5, the aortic arches (the persistent left aortic arch hidden); A, subvertebral aorta; o, o', omphalomeseraic artery and vein, to and from U, the umbilical vesicle with its vitelline duct, dv; u, u, the two hypogastric or umbilical arteries, with the ramifications, u", u", in the placenta; u', umbilical vein; vh, hepatic vein; cv, inferior vena cava; vil, iliac veins; az, an azygous vein; vc, a posterior cardinal vein; vi, innominate vein; vp, portal vein; Dv, the ductus venosus; DC, a ductus Cuvieri. The anterior cardinal vein is seen beginning in the head and running down to the ductus Cuvieri, on the under side of the numbers 1, 2, 3, 4, 5." -Whitney, 1911

Human Embryo

"Early Human Embryo, giving diagrammatically the principal vessels antecedent to the establishment of…

"Argent (silver), a heart gules (red), ensigned with a royal crown. In heraldry, to distinguish (a charge) by a mark or an ornament, as a crown, coronet, or miter." -Whitney, 1911

Ensign

"Argent (silver), a heart gules (red), ensigned with a royal crown. In heraldry, to distinguish (a charge)…

An illustration of a fish fishing for a woman with a heart as bait.

Woman Being Fished For

An illustration of a fish fishing for a woman with a heart as bait.

Exterior of the Cathedral of St. Stephen, also called Stephansdom, in the heart of old Vienna. Its construction lasted 65 years, from 1368 to 1433. A glory of St. Stephen's Cathedral is its ornately patterned, richly colored roof.

St. Stephen's Cathedral, Vienna

Exterior of the Cathedral of St. Stephen, also called Stephansdom, in the heart of old Vienna. Its construction…

The Cathedral of St. Stephen, also called Stephansdom, stands in the heart of old Vienna. The Cathedral is considered a work of Gothic art, and boosts of a beautiful carved pulpit. So that the local language sermon could be better heard by the worshipers before microphones and loud speakers, the pulpit stands against a pillar out in the nave, instead of in the chancel at the front of the church.

St. Stephen's Cathedral Pulpit

The Cathedral of St. Stephen, also called Stephansdom, stands in the heart of old Vienna. The Cathedral…

View of man striking the Christmas chimes at the Cathedral of St. Stephen, also called Stephansdom, stands in the heart of old Vienna.

Striking the Christmas Chimes at St. Stephen's Cathedral, Vienna

View of man striking the Christmas chimes at the Cathedral of St. Stephen, also called Stephansdom,…

An illustration of a heart.

Heart

An illustration of a heart.

"I long to lay this aching head and wounded heart beneath the soil, To slumber in that dreamless bed from all my toil." -Trowbridge, 1866

Poetic Rebus

"I long to lay this aching head and wounded heart beneath the soil, To slumber in that dreamless bed…

An illustration of a heart with an arrow.

Heart with Arrow

An illustration of a heart with an arrow.

The White Clover ((Trifolium repens) stems are spreading, slender and creeping. The leaves are are inversely heart-shaped, the flower-heads are small and white. The White Clover can easily accomadate itself to a great variety of soils, but grows most luxuriantly in moist grounds and moist or wet seasons.

White Clover

The White Clover ((Trifolium repens) stems are spreading, slender and creeping. The leaves are are inversely…

The White Clover ((Trifolium repens) stems are spreading, slender and creeping. The leaves are are inversely heart-shaped, the flower-heads are small and white. The White Clover can easily accomadate itself to a great variety of soils, but grows most luxuriantly in moist grounds and moist or wet seasons. This flower is magnified.

White Clover

The White Clover ((Trifolium repens) stems are spreading, slender and creeping. The leaves are are inversely…

The class of crustacea is divided into two sub-classes, Entomostraca and Malacostraca. The first, Entomostraca, contains the fairy-shrimps (Branchipus). A simple Crustacean, the fairy shrimp body is distinctly separated into head, thorax, and abdomen. This diagram shows parts of the fairy-shimp, (b) brood-pouch, (e,e') compound and simple eyes, (f) paddle-shaped feet, (h) tubular heart, and (i) intestine.

Fairy-shrimp

The class of crustacea is divided into two sub-classes, Entomostraca and Malacostraca. The first, Entomostraca,…

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are related. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom; they are also mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. This disscetion of a crayfish shows the following: (b) brain, (h) heart, (i) intestine, (k) kidney, (l) liver, (n) nerve cord, (r) reproductive organ, (s) stomach.

Crayfish

Crayfish, crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they…

"Argent, a man's heart gules, ensigned with a celestial crown or. ENSIGNED. This word, in heraldic description, means ornamented." -Hall, 1862

Heart Ensigned

"Argent, a man's heart gules, ensigned with a celestial crown or. ENSIGNED. This word, in heraldic description,…

This brooch is heart shaped with ribbons of gems, dripping with pearls.

Brooch

This brooch is heart shaped with ribbons of gems, dripping with pearls.

"Crankcase showing bearings. The heart of the automobile is the engine. It is built around the crankcase, which is its foundation or base." -Bodmer, 1917

Building an Automobile, Step 01: Crankcase

"Crankcase showing bearings. The heart of the automobile is the engine. It is built around the crankcase,…

"Longitudinal Section through a Fresh-water Mussel. a, edge of mantle; b, foot, with position of ganglion indicated; c, gills; d, mouth; e, tentacles or palps; f, posterior adductor muscle; g, anterior adductor; h, head-ganglion; i, ventricle of heart; j, auricle of heart; k, rectum; l, kidney; m, exhalent aperture; n, inhalent aperture." -Vaughan, 1906

Mussel Anatomy

"Longitudinal Section through a Fresh-water Mussel. a, edge of mantle; b, foot, with position of ganglion…

"Fig 55. - Actual section of the body in the thoracic region of a bird. N, neural canal; H, haemal canal; c, centrum of a dorsal vertebra; hy, hypapophysis; d, diapophysis; z, zygapophysis; ns, neural spine; r, pleurapophysis, or vertebral part of a free rib, bearing u, uncinate process or epipleura; cr, haemapophyses; or sternal part of the same; st, section of the sternum or breast-bone (haemal spine). Designed by Dr. R. W. Shufeldt, USA. This figure shows such a section, made across the thoracic or chest-region of the trunk. Here the upper ring (neural) is contracted, only surrounding the slender spinal cord, while the lower ring is expanded to enclose the heart and lungs." Elliot Coues, 1884

The Axial Skeleton

"Fig 55. - Actual section of the body in the thoracic region of a bird. N, neural canal; H, haemal canal;…

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left subclavian; rs, right subclavian; lc, left carotid; rc, right carotid. Aves bicarotidinae normales, with two carotids, both alike." Elliot Coues, 1884

Carotid Arteries of Birds

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left…

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left subclavian; rs, right subclavian; lc, left carotid; rc, right carotid. Aves laevo-carotidinae, with left carotid only." Elliot Coues, 1884

Carotid Arteries of Birds

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left…

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left subclavian; rs, right subclavian; lc, left carotid; rc, right carotid. Aves bicarotidinae abnormalis, certail parrots, with two carotids, not alike." Elliot Coues, 1884

Carotid Arteries of Birds

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left…

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left subclavian; rs, right subclavian; lc, left carotid; rc, right carotid. Aves conjuncto-carotidinae, with two carotids, which speedily unite in one.Bittern, both alike." Elliot Coues, 1884

Carotid Arteries of Birds

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left…

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left subclavian; rs, right subclavian; lc, left carotid; rc, right carotid. Aves conjuncto-carotidinae, with two carotids, which speedily unite in one. Flamingo, left very small" Elliot Coues, 1884

Carotid Arteries of Birds

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left…

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left subclavian; rs, right subclavian; lc, left carotid; rc, right carotid. Aves conjuncto-carotidinae, with two carotids, which speedily unite in one. Cockatoo, right very small." Elliot Coues, 1884

Carotid Arteries of Birds

"h, root of aorta; 1, arch of aorta, to the right side; li, left innominate; ri, innominate; ls, left…

"This is the curve of the heart cam for converting uniform rotary motion into uniform reciprocal motion." —French, 1911

Curve, Heart Cam

"This is the curve of the heart cam for converting uniform rotary motion into uniform reciprocal motion."…

The illustration is showing both inside and outside view of the tadpole. The left inside view shows the tadpole with two front legs, heart, intestines, and gills. The right image shows the tadpole with frog like features with forelegs, back legs, and a tail.

Inside and Outside View of Tadpole During Metamorphosis

The illustration is showing both inside and outside view of the tadpole. The left inside view shows…

The central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes

Wheel Hub

The central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes

A structure in a hollow organ like the heart with a flap to insure one-way flow of fluid through it

Fine Threading Valve

A structure in a hollow organ like the heart with a flap to insure one-way flow of fluid through it