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Very soon after the entrance of the ovum into the uterus, in the human subject, the outer surface of the chorion is found beset with fine processes, the so-called chorion villi, which give it a rough and shaggy appearance. Shown is a magnified view of chorion villi.

Magnified View of Chorion Villi

Very soon after the entrance of the ovum into the uterus, in the human subject, the outer surface of…

Section of the lining membrane of a human uterus at the period of commencing pregnancy showing the arrangement and other peculiarities of the glands, d, with their orfices, a, on the internal surface of the organ.

Lining Membrane of the Uterus

Section of the lining membrane of a human uterus at the period of commencing pregnancy showing the arrangement…

Diagram of an early stage of the formation of the human placenta. Labels: a, embryo; b, amnion; c, placental vessels; d, decidua reflexa; e, allantois; f, placental villi; g, mucous membrane.

Early Formation of the Placenta

Diagram of an early stage of the formation of the human placenta. Labels: a, embryo; b, amnion; c, placental…

A, Magnified view of the head and neck of a human embryo of three weeks. Labels: 1, anterior cerebral vesicle or cerebrum; 2, middle cerebral vesicle; 3, middle or frontonasal process; 4, superior maxillary process, or first visceral arch, and below it the first cleft; 7, 8, 9, second, third, and fourth arches and clefts. B, Anterior view of the head of a human fetus of about the fifth week. 1, 2, 3, 5, the same parts as in A; 4, the external nasal or lateral frontal process: 6, the superior maxillary process; 7, the lower jaw; X, the tongue; 8, first branchial cleft becoming the meatus auditorius externus.

Head of an Embryo

A, Magnified view of the head and neck of a human embryo of three weeks. Labels: 1, anterior cerebral…

A human embryo of the fourth week. I, the chorion; 3, part of the amnion; 4, umbilical vesicle with its long pedicle passing into the abdomen; 7, the heart; 8, the liver; 9, the visceral arch destined to form the lower jaw, beneath which are two other visceral arches separated by the branchial clefts; 10, rudiment of the upper extremity, 11, that of the lower extremity; 12, the umbilical cord; 15, the eye; 16, the ear; 17, cerebral hemispheres; 18, optic lobes, corpora quadrigemina.

Embryo at Fourth Week

A human embryo of the fourth week. I, the chorion; 3, part of the amnion; 4, umbilical vesicle with…

Early stages in development of human brain. 1, 2, 3, are from an embryo about seven weeks old; 4, about three months old. m, middle cerebral vesicle (mesencephalon); c, cerebellum; m o, medulla oblongata; i, thalamencephalon; h, hemispheres; i', infundibulum; Fig. 3 shows the several curves which occur in the course of development; Fig. 4 is a lateral view, showing the great enlargement of the cerebral hemispheres which have covered in the thalami, leaving the optic lobes, m, uncovered.

Development of the Brain

Early stages in development of human brain. 1, 2, 3, are from an embryo about seven weeks old; 4, about…

Diagrammatic sketch of a vertical longitudinal section through the eyeball of a human fetus of four weeks. The section is a little to the side, so as to avoid passing through the ocular cleft; c, the cuticle where it becomes later the corneal epithelium; l, the lens; op, optic nerve formed by the pedicle of the primary optic vesicle; vp, primary medullary cavity or optic vesicle; p, the pigment layer of the retina; r, the inner wall forming the retina proper; vs, secondary optic vesicle containing the rudiment of the vitreous humour.

Eye of Fetus of Four Weeks

Diagrammatic sketch of a vertical longitudinal section through the eyeball of a human fetus of four…

Transverse vertical section of the eyeball of a human embryo of four weeks. The anterior half of the section is represented: pr, the remains of the cavity of the primary optic vesicle; p, the inner part of the outer layer forming the retinal pigment; r, the thickened inner part giving rise to the columnar and other structures of the retina; v, the commencing vitreous humour within the secondary optic vesicle; v', the ocular cleft through which the loop of the central blood vessel, a, projects from below; l, the lends with a central cavity.

Eye of Fetus of Four Weeks

Transverse vertical section of the eyeball of a human embryo of four weeks. The anterior half of the…

"Ruby-eyed Limpet, from the Antilles. If the common Limpet is alarmed, no human force, pulling in a direct line, can remove it."

Patella Granatina (Linnaeus)

"Ruby-eyed Limpet, from the Antilles. If the common Limpet is alarmed, no human force, pulling in a…

The head of the bald eagle.

Bald Eagle Head

The head of the bald eagle.

"Section through right ear. 1, helix; 2, concha; 3, outer passage; 4, 5, 6, semi-circular canals; 7, oval window; 8, cochlea; 9, Eustachian tube; 10, eardrum." -Foster, 1921

Ear

"Section through right ear. 1, helix; 2, concha; 3, outer passage; 4, 5, 6, semi-circular canals; 7,…

"Section through the left eye, closed. 1, lifting muscle; 2, upper straight muscle; 3, optic nerve; 4, fatty cushion; 5, lower straight muscle; 6, vitreous humor; 7, lower cross muscle; 8, lower eyelid; 9, upper eyelid; 10, crystalline lens." -Foster, 1921

Eye Section

"Section through the left eye, closed. 1, lifting muscle; 2, upper straight muscle; 3, optic nerve;…

"Cross-section of the eye. Parts: co, cornea; I, iris; aq, anterior chamber of aqueous humor; L, lens; cp, ciliary process; sc, sclerotic coat; R, retina; ch, choroid; V, vitreous body; m, yellow spot; bs, blind spot; O, optic nerve." -Foster, 1921

Eye Cross-Section

"Cross-section of the eye. Parts: co, cornea; I, iris; aq, anterior chamber of aqueous humor; L, lens;…

br: the branchiae, or gill-openings c: the heart f: the liver vn: swimming bladders ci: intestinal canal o: the ovaries u: urethra a: anus o': oviduct

Anatomy of the Carp

br: the branchiae, or gill-openings c: the heart f: the liver vn: swimming bladders ci: intestinal canal…

"The senses of touch, smell, taste and hearing are very slightly developed in birds. The organ of sight is indeed more highly developed in birds than in any other class of animals."

Internal Anatomy of Birds

"The senses of touch, smell, taste and hearing are very slightly developed in birds. The organ of sight…

Front view of a man in the anatomical position. On one lateral half the parts are labeled in English, on the other in Latin. The right upper limb is drawn away from the trunk in the order to show the arm more fully than is possible when it hangs perpendicularly.

Front View of the Parts of the Human Body Labeled in English and Latin

Front view of a man in the anatomical position. On one lateral half the parts are labeled in English,…

Back view of a man. On one lateral the names of the parts are given in English, on the other in Latin.

Back View of the Parts of the Human Body Labeled in English and Latin

Back view of a man. On one lateral the names of the parts are given in English, on the other in Latin.

The engraved illustration of the Fall of Lucifer from the block book, Speculum Humanae Salvationis (Mirror of Human Salvation).

Speculum Humanae Salvationis

The engraved illustration of the Fall of Lucifer from the block book, Speculum Humanae Salvationis (Mirror…

The human skeleton.

The Human Skeleton

The human skeleton.

The human skeleton.

The Human Skeleton

The human skeleton.

The side view of a human neck.

Neck

The side view of a human neck.

Section of human placenta at end of pregnancy. The fetal blood vessels have been injected; the maternal blood spaces appear as clear areas surrounding the sections of the fetal villi.

Section of Placenta

Section of human placenta at end of pregnancy. The fetal blood vessels have been injected; the maternal…

Nerve cells of human spinal cord stained to show Nissl bodies. Labels: D, dendrites; A, axons; C, implantation cone; N, nucleus; M, nucleolus.

Neuron of Spinal Cord

Nerve cells of human spinal cord stained to show Nissl bodies. Labels: D, dendrites; A, axons; C, implantation…

Reconstruction of peripheral nerves of human embryo of five weeks.

Peripheral Nerves of Human Embryo

Reconstruction of peripheral nerves of human embryo of five weeks.

Section of human cornea.

Section of Cornea

Section of human cornea.

A human eye, used for sight, pictured with an eyebrow.

Eye

A human eye, used for sight, pictured with an eyebrow.

The hand is the intricate, multi-fingered body part normally located at the end of each arm of a human.

Hand Pointing

The hand is the intricate, multi-fingered body part normally located at the end of each arm of a human.

In human anatomy, the ureters are muscular tubes that propel urine from the kidneys to the urinary bladder.

Transverse Section of Ureter

In human anatomy, the ureters are muscular tubes that propel urine from the kidneys to the urinary bladder.

General view of the human skeleton.

Skeleton

General view of the human skeleton.

Cross section of developing bone of human fetus of four months. Labels: a, periostem; b, boundary between endochondral and periosteal bone; c, perichondral bone; d, remains of area of calcification; e, endochondral bone; f, f', blood vessels; g, g', developing Haversian spaces; h, marrow; i, blood vessels.

Developing Bone

Cross section of developing bone of human fetus of four months. Labels: a, periostem; b, boundary between…

Osteoblasts from the parietal bone of a human embryo thirteen weeks old. Labels: a, bony septa with the cells of he lacunae; b, layers of osteoblasts; c, the latter in transition to bone corpuscles.

Osteoblasts from Embryo

Osteoblasts from the parietal bone of a human embryo thirteen weeks old. Labels: a, bony septa with…

The human flea (Pulex irritans) is a parasitic insect that actually has several hosts despite its name.

Human Flea

The human flea (Pulex irritans) is a parasitic insect that actually has several hosts despite its name.

"The branch vascular bundles will be distinctly seen, resembling in some respects the arteries and veins of the human body. A careful examination will show that these are also covered with a very fine lace-work of cells under and over them, and interspersed among the latter will be seen a vast assemblage of translucent dottings, each having an opening across it corresponding to those of the stomates under which they were situated before dissection." -Watts, 1874

Microscopic view of a leaf

"The branch vascular bundles will be distinctly seen, resembling in some respects the arteries and veins…

"These fragile creatures are able to make long voyages on the surface of the sea. Their nature is such that they are required to keep constantly moving in order to sustain themselves in the fluid which they inhabit. There is a double movement of their light skeletons, which may be compared to the action of respiration in the human hest."

Rhyzostoma Cuvierii

"These fragile creatures are able to make long voyages on the surface of the sea. Their nature is such…

A cave is a natural underground void large enough for a human to enter.

Cave

A cave is a natural underground void large enough for a human to enter.

An illustration of a cliff with with a cave. A cave is a natural underground void large enough for a human to enter.

Cave

An illustration of a cliff with with a cave. A cave is a natural underground void large enough for a…

Purkinjean cell from human cerebellum, as seen in a plane transverse to the long axis of a cerebellar folium. Labels: a, axon; clt., collaterals.

Purkinjean Cell from Cerebellum

Purkinjean cell from human cerebellum, as seen in a plane transverse to the long axis of a cerebellar…

Longitudinal section through human nail and its nail groove (sulcus).

Longitudinal Section Through Fingernail

Longitudinal section through human nail and its nail groove (sulcus).

Transverse section through human nail and its nail groove (sulcus).

Transverse Section Through Fingernail

Transverse section through human nail and its nail groove (sulcus).

Section of human pancreas, showing pancreatic islands.

Section of Pancreas

Section of human pancreas, showing pancreatic islands.

A bust is a sculpted or cast representation of the upper part of the human figure, depicting a person's head and neck, as well as a variable portion of the chest and shoulders. The piece is normally supported by a plinth. These forms recreate the likeness of an individual. These may be of any suitable material (such as marble, bronze or clay).

Bust of Man

A bust is a sculpted or cast representation of the upper part of the human figure, depicting a person's…

Section through the central canals of the spinal cord of a human embryo, showing ependymal (A) and neuroglial cells (B).

Section Through Spinal Cord Showing Neuroglial Cell

Section through the central canals of the spinal cord of a human embryo, showing ependymal (A) and neuroglial…

Human fetus in the third month of development, with the brain and spinal cord exposed from behind.

Brain and Spinal Cord of Fetus

Human fetus in the third month of development, with the brain and spinal cord exposed from behind.

Two stages in the development of the human brain. A. Brain of an human embryo of the third week. B. Brain of an embryo of five weeks.

Development of Human Brain

Two stages in the development of the human brain. A. Brain of an human embryo of the third week. B.…

Two cross sections through the forebrain. A. Through the forebrain of the early human embryo. B. Through the forebrain and optic vesicles of Lepidosteus embryo of eight days.

Section Through Forebrain of Human and Lepidosteus Embryos

Two cross sections through the forebrain. A. Through the forebrain of the early human embryo. B. Through…

The brain of a human embryo in the fifth week. A, Brain as seen in profile. B, Mesial section through the same brain. Labels: M, mammillary eminence, Tc, tuber cinereum; Hp, Hypophysis (pituitary diverticulum from buccal cavity); Opt, optic stalk; TH, optic thalamus; Tg, tegmental part of mesencephalon; Ps, pars subtalamica; Cs, corpus striatum; FM, foramen of Monro; L, lamina terminalis; RO, recessus opticus; RI, recessus infundibuli.

Brain of Embryo

The brain of a human embryo in the fifth week. A, Brain as seen in profile. B, Mesial section through…

Profile view of brain of a human embryo of ten weeks. The various cranial nerves are indicated by numerals. A, Cerebral diverticulum of pituitary body. B, Buccal diverticulum of pituitary body.

Brain of Embryo

Profile view of brain of a human embryo of ten weeks. The various cranial nerves are indicated by numerals.…

Front view of the medulla, pons, and mesencephalon of a full term human fetus.

Front view of Medulla, Pons, and Mesencephalon

Front view of the medulla, pons, and mesencephalon of a full term human fetus.

Back view of the medulla, pons, and mesencephalon of a full term human fetus.

Back View of Medulla, Pons, and Mesencephalon

Back view of the medulla, pons, and mesencephalon of a full term human fetus.

Lateral view of the medulla, pons, and mesencephalon of a full term human fetus.

Lateral View of Medulla, Pons, and Mesencephalon

Lateral view of the medulla, pons, and mesencephalon of a full term human fetus.

Transverse section through the closed part of the human medulla immediately above the decussation of the pyramids.

Transverse Section Through Closed Part of Medulla

Transverse section through the closed part of the human medulla immediately above the decussation of…

Transverse section through the human medulla in the lower olivary region.

Section Through Medulla in Olivary Region

Transverse section through the human medulla in the lower olivary region.

Transverse section through the the middle of the olivary region of the human medulla or bulb.

Section Through Medulla in Olivary Region

Transverse section through the the middle of the olivary region of the human medulla or bulb.

Section through the lower part of the human pons varolii immediately above the medulla.

Section Through Pons Varolii

Section through the lower part of the human pons varolii immediately above the medulla.

Showing the development of the cerebellum. A, Transverse section through the forepart of the cerebellum of a sheep embryo. B, Transverse section through the hinder part of the cerebellum of a sheep embryo. C, Cerebellum of a human fetus 17 cm long. D, Median section through cerebellum of sheep embryo 5 cm long.E, Median section through cerebellum of human fetus 17 cm long. Labels: 1, sulcus primarius; 2, sulcus above and afterwards behind the pyramid; 3, sulcus between pyramid and uvula; 4, great horizontal fissure; r.l., lateral recess ventricle IV; T, transverse groove in roof of ventricle IV.

Development of Cerebellum

Showing the development of the cerebellum. A, Transverse section through the forepart of the cerebellum…

An illustration of Biscayne Bay, is a lagoon that is approximately 35 miles (56 km) long and up to 8 miles (13 km) wide located on the Atlantic coast of south Florida. It is usually divided for purposes of discussion and analysis into three parts, North Bay, Central Bay and South Bay. North Bay separates Miami Beach on its barrier island from Miami on the mainland. It has been severely affected over the last century by raw sewage releases, urban runoff, shoreline bulkheading, dredging, the creation of artificial islands and the loss of natural fresh water flow into the bay. North Bay accounts for only 10% of the water area of the bay. Central Bay is the largest part of the bay. It is separated from the Atlantic Ocean by the Safety Valve, a series of shallow flats separated by tidal flow channels, stretching from the south end of Key Biscayne to the Ragged Keys at the north end of the Florida Keys. It has been adversely affected primarily by bulkheading, urban runoff discharged by canals, and the loss of natural fresh water flow. South Bay is nearly as large as Central Bay, and is the least affected by human activities, although it also suffers from the loss of natural fresh water flow. South Bay is separated from the Atlantic Ocean by the northernmost of the Florida Keys, and is connected to Florida Bay through channels and "sounds" lying between the mainland and the keys.

Biscayne Bay

An illustration of Biscayne Bay, is a lagoon that is approximately 35 miles (56 km) long and up to 8…

The Shedu is a celestial being from Mesopotamian mythology. He is a human above the waist and a bull below the waist. He also has the horns and the ears of a bull. The bull man helps people fight evil and chaos. He holds the gates of dawn open for the sun god Shamash and supports the sun disc. He is often shown on Cylinder Seals. It appears frequently in Mesopotamian art, sometimes with wings. Statues of the bull-man were often used as gatekeepers.

Shedu

The Shedu is a celestial being from Mesopotamian mythology. He is a human above the waist and a bull…

An illustration of a Norse Galley. Norse is an adjective relating things to Norway, Denmark, Faroe Islands, Greenland, Iceland and Sweden. A galley is an ancient ship which can be propelled entirely by human oarsmen, used for warfare and trade. Oars are known from at least the time of the Egyptian Old Kingdom. Many galleys had masts and sails for use when the winds were favorable.

Norse Galley

An illustration of a Norse Galley. Norse is an adjective relating things to Norway, Denmark, Faroe Islands,…

A soldier lying in the prone position. In anatomy,the prone position is a position of the body lying face down.

Soldier, Prone

A soldier lying in the prone position. In anatomy,the prone position is a position of the body lying…

A soldier lying in the prone position, throwing a grenade. In anatomy,the prone position is a position of the body lying face down.

Soldier, Prone, Throwing Grenade

A soldier lying in the prone position, throwing a grenade. In anatomy,the prone position is a position…