The Amphibian Anatomy ClipArt gallery features 59 illustrations of amphibian skeletal and organ system views, diagrams of movement in water, and related images.

Archegosaurus is a genus of amphibian which lived during the Asselian to Wuchiapingian ages of the Permian, around 299-253 million years ago.

Archegosaurus Head

Archegosaurus is a genus of amphibian which lived during the Asselian to Wuchiapingian ages of the Permian,…

Archegosaurus is a genus of amphibian which lived during the Asselian to Wuchiapingian ages of the Permian, around 299-253 million years ago. Pictured here is the dorsal vertebrae.

Dorsal Vertebrae of the Archegosaurus

Archegosaurus is a genus of amphibian which lived during the Asselian to Wuchiapingian ages of the Permian,…

Branchiosaurus (Greek for "gill lizard") is a genus of small, lightly-built early prehistoric amphibians. Pictured here is the dorsal vertebra.

Dorsal Vertebra of Branchiosaurus

Branchiosaurus (Greek for "gill lizard") is a genus of small, lightly-built early prehistoric amphibians.…

"Vertebral column and pelvic girdle of bull-frog. t.p., Transvers processes of sacral vertebra; Il., ilium; U., urostyle; Fe., femur; Isch., ischiac region." -Thomson, 1916

Bullfrog Vertebrae

"Vertebral column and pelvic girdle of bull-frog. t.p., Transvers processes of sacral vertebra; Il.,…

Capillaries (C) in the web of the frog's foot connecting a small artery (A) with a small vein (V).

Capillaries in Frog's Foot

Capillaries (C) in the web of the frog's foot connecting a small artery (A) with a small vein (V).

Development of capillaries in the regenerating tail of a tadpole. a b c d, sprouts and cords of protoplasm.

Development of Capillaries of a Tadpole

Development of capillaries in the regenerating tail of a tadpole. a b c d, sprouts and cords of protoplasm.

Development of capillaries in the regenerating tail of a tadpole. a b c d, sprouts and cords of protoplasm. The sprouts and cords of protoplasm have become channeled out into capillaries.

Development of Capillaries of a Tadpole

Development of capillaries in the regenerating tail of a tadpole. a b c d, sprouts and cords of protoplasm.…

Capillary blood vessel of the tail of a young larval frog. a, capillaries permeable to blood; b, fat granules attached to the walls of the vessels, and concealing the nuclei; c, hollow prolongation of a capillary ending in a point; d, a branching cell with nucleus and fat granules; it communicates by three branches with prolongation of capillaries already formed; e, blood corpuscles still containing granules of fat.

Capillary Blood Vessels of Larval Frog

Capillary blood vessel of the tail of a young larval frog. a, capillaries permeable to blood; b, fat…

Circulation in frog's foot under a microscope. Labels: A, walls of capillaries; B, tissue of web lying between the capillaries; C, cells of epidermis covering web (these are only shown in the right-hand and lower part of the field; in the other parts of the field the focus of the microscope lies below the epidermis); D, nuclei of these epidermic cells; E, pigment cells contracted, not partially expanded; F, red blood corpuscle (oval in the frog) passing along capillary -- nucleus not visible; G, another corpuscle squeezing its way through a capillary, the canal of which is smaller than its own transverse diameter; H, another bending as it slides round a corner; K, corpuscle in capillary seen through the epidermis; I, white blood corpuscle.

Circulation in a Frog's Foot

Circulation in frog's foot under a microscope. Labels: A, walls of capillaries; B, tissue of web lying…

Circulation in the web of a Frog's foot.

Circulation in the Web of a Frog's Foot

Circulation in the web of a Frog's foot.

A diagram of the circulation of a frog. Labels: 1, The pericardium. 2, The single ventricle. 3, The right auricle. 4, The left auricle. The arrows indicate the direction of the blood.

Circulation of a Frog

A diagram of the circulation of a frog. Labels: 1, The pericardium. 2, The single ventricle. 3, The…

Horizontal preparation of cornea of frog; showing the network of branched cornea-corpuscles. The ground substance was completely colorless.

Magnified Frog Cornea Showing Branched Corpuscles

Horizontal preparation of cornea of frog; showing the network of branched cornea-corpuscles. The ground…

"Frog with the left side cut away and some of the organs pulled downward. a, aorta leading from the ventricle; b, bladder; c, spinal cord surrounded by the vertebral column of bone; d, small intestine; e, opening of the lungs into the pharynx; h, ventricle of the heart; k, kidney; l, lung; liv, liver; n, brain; ov, ovary; ovd, oviduct; p, pancreas; r, rectum; sp, spleen; st, stomach; t, tongue; si, small intestine; u, left auricle; ur, ureter; v, vena cava; vc, body of vertebra." —Davison, 1906

Dissected Frog

"Frog with the left side cut away and some of the organs pulled downward. a, aorta leading from the…

Skull of <em>salamandra maculosa</em>, the fire salamander.

Skull of fire salamander

Skull of salamandra maculosa, the fire salamander.

The foot of a frog, which is useful in and out of water.

Frog Foot

The foot of a frog, which is useful in and out of water.

This illustration shows the ancient fossile of an amphibian. Fossils are the mineralized or otherwise preserved remains or traces of animals, plants, and other organisms.

Fossil

This illustration shows the ancient fossile of an amphibian. Fossils are the mineralized or otherwise…

A side view of a frog's internal structure.

Frog

A side view of a frog's internal structure.

A ventral view of a frog's internal structure.

Frog

A ventral view of a frog's internal structure.

A ventral view of a frog's internal nervous system.

Frog

A ventral view of a frog's internal nervous system.

The heart and lungs of a frog. 1: Heart. 2: Arch of the aorta. 3: Pulmonary artery. 4: Pulmonary veins. 5: Aorta. 6: Vena cava.

Frog

The heart and lungs of a frog. 1: Heart. 2: Arch of the aorta. 3: Pulmonary artery. 4: Pulmonary veins.…

"Arterial system of frog. l., Lingual; c., carotid; s., systemic; cu., cutaneous; p., pulmonary; v., occipito-vertebral; br., brachial; c.m., coeliaco-mesenteric; r., renal; il., common iliacs; h., haemorrhoidal." -Thomson, 1916

Frog Arterial System

"Arterial system of frog. l., Lingual; c., carotid; s., systemic; cu., cutaneous; p., pulmonary; v.,…

Blood corpuscles of a frog. Highly magnified. The appearance of blood cells in different animals varies in shape and size.

Frog Blood Corpuscles

Blood corpuscles of a frog. Highly magnified. The appearance of blood cells in different animals varies…

"Rana esculenta. The brain. A, from above; B, from below. ch. opt, optic chiasma; HH, cerebellum; Hyp, pituitary body; Inf, infundibulum; L. ol, olfactory lobe; Med, spinal cord; MH, mid-brain; NH, medulla oblongata; Th. opt, optic thalamus; Tr. opt, optic tract; VH, cerebral hemisphere; ZH, diencephalon; I-X, cerebral nerves; XII. (1), hypoglossal (first spinal) nerve." -Parker, 1900

Edible Frog Brain

"Rana esculenta. The brain. A, from above; B, from below. ch. opt, optic chiasma; HH, cerebellum; Hyp,…

"Chondrocranium of Frog (Rana esculenta). y, girdle-bone or os en ceinture; EO, exoccipital; PrO, pro&ouml;tic; QJ, quadratojugal." -Whitney, 1911

Frog Chondrocranium

"Chondrocranium of Frog (Rana esculenta). y, girdle-bone or os en ceinture; EO, exoccipital; PrO, proötic;…

"The Tadpole is the larva of the anurous amphibia, sometimes so far extended as to include larva&aelig; of the urodela, which undergo a much less complete metamorphosis. At first the young have no respiratory organs or limbs. They are all head and tail with simple entire gills which soon disappear, to be followed by others of more complicated structure, situated within the cavity of the body as in fishes. After a certain length of time the hind legs begin to appear, the head becomes more developed, and the body assumes a more compact form. Still later the forelegs are found to exist fully formed beneath the skin and ready ultimately to burst forth. The tadpole at first seems to derive its subsistence from the fluid absorbed within its body and on the surface, but soon begins to seek its food amidst softened or decomposing vegetable matter. From that period the tadpole begins to assume more and more the appearance of a frog. Toes appear on its hind legs, the tail very rapidly disappears by absorption, and finally the fore-legs become fully developed and the metamorphosis of the tadpole is completed."&mdash;(Charles Leonard-Stuart, 1911)

Frog Egg

"The Tadpole is the larva of the anurous amphibia, sometimes so far extended as to include larvaæ…

"Rana esculenta. Urinogenital organs of the female. N, kidneys; Od, oviduct; Ot, its coelomic aperture; Ov, left ovary (the right is removed); P, cloacal aperture of oviduct; S.S', cloacal apertures of ureters; Ut, uterine dilatation of oviduct." -Parker, 1900

Female Edible Frog Genital Organs

"Rana esculenta. Urinogenital organs of the female. N, kidneys; Od, oviduct; Ot, its coelomic aperture;…

"Rana esculenta. Urinogenital organs of the male. Ao, dorsal aorta; Cl, cloaca; Cv, post-caval vein; FK, fat bodies; HO, testes; N, kidneys; S, apertures of ureters into cloaca; Ur, ureters." -Parker, 1900

Male Edible Frog Genital Organs

"Rana esculenta. Urinogenital organs of the male. Ao, dorsal aorta; Cl, cloaca; Cv, post-caval vein;…

"Diagram of the heart and branchial arches in the Frog. c.g., carotid gland; l., lungs; l.a., left auricle; r.a., right auricle...a, aorta; au., auricle; c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle." -Galloway, 1915

Frog Heart

"Diagram of the heart and branchial arches in the Frog. c.g., carotid gland; l., lungs; l.a., left auricle;…

"Nervous system of frog. 1-10, The cranial nerves; oc., eyes; crb., in front of optic chiasma; to., optic tract; sym., sympathetic system; msp., spinal cord; sp., spinal nerves." -Thomson, 1916

Frog Nervous System

"Nervous system of frog. 1-10, The cranial nerves; oc., eyes; crb., in front of optic chiasma; to.,…

"Pectoral girdle of Rana esculenta. The cartilaginous parts are dotted. Ep., Episternum; om., omosternum; Ep.c., Epicoracoids; st., sternum; x., xiphisternum; cl., clavicle with underlying precoracoid cartilage; co., coracoid; Sc., scapula; S.sc., supra-scapula; Gl., glenoid cavity for humerus." -Thomson, 1916

Frog Pectoral Girdle

"Pectoral girdle of Rana esculenta. The cartilaginous parts are dotted. Ep., Episternum; om., omosternum;…

"Rana esculenta. Pelvic girdle from the right side. G, acetabulum; Il, P, ilium; Is, ischium; Kn, pubis." -Parker, 1900

Edible Frog Pelvic Girdle

"Rana esculenta. Pelvic girdle from the right side. G, acetabulum; Il, P, ilium; Is, ischium; Kn, pubis."…

"Rana esculenta. The shoulder girdle from the ventral aspect. Co, coracoid; Co', epicoracoid; Cl, clavicle; G, glenoid cavity; Ep, episternum; Fe, fenestra between procoracoid and coracoid; KC, cartilage separating scapula and clavicle; Kn, xiphisternum; m, junction of epicoracoids; S, scapula; St, sternum." -Parker, 1900

Edible Frog Shoulder Girdle

"Rana esculenta. The shoulder girdle from the ventral aspect. Co, coracoid; Co', epicoracoid; Cl, clavicle;…

The skeleton of a frog.

Frog skeleton

The skeleton of a frog.

The skeleton of a frog.

Frog Skeleton

The skeleton of a frog.

"Skeleton of frog. The half of the pectoral girdle, and fore- and hind-limb of the right side are not shown. pmx., premaxilla; m.x., maxilla; n., nasal; sph., sphenethmoid; p.f., parieto-frontal; P.O., pro-otic; pt., pterygoid; q.j., quadrato-jugal; sq., squamosal; Q., quadrate; c., columella auris; A., atlas; t.p., transverse process; S.V., sacral vertebra; U., urostyle; S.sc., supra scapula; H., humerus; R.U., radio ulna; Cp., carpals; Mc., metacarpals; Il., ilium; Is., ischium; F., femur; T.F., tibio-fibula; Ca., calcaneum; As., astragalus; C., calcar; Mt., metatarsals." -Thomson, 1916

Frog Skeleton

"Skeleton of frog. The half of the pectoral girdle, and fore- and hind-limb of the right side are not…

"Skull of frog. Lower surface-- Pmx., premaxilla; M., maxilla; Q.j., quadrato-jugal; Q., quadrate; Pt., pterygoid; Ps., parasphenoid; P.O., pro-otic; Sp.E., sphenethmoid; Pl., palatine; V., vomer; c., columella." -Thomson, 1916

Lower Surface of Frog Skull

"Skull of frog. Lower surface-- Pmx., premaxilla; M., maxilla; Q.j., quadrato-jugal; Q., quadrate; Pt.,…

"Skull of frog. Upper surface-- Pmx., premaxilla; N., nasal; M., maxilla; Sq., squamosal; Q.j., quadrato-jugal; e.o., ex-occipitals; P.f., parieto-frontals; Sph.E., sphenethmoid; P.O., pro-otic." -Thomson, 1916

Upper Surface of Frog Skull

"Skull of frog. Upper surface-- Pmx., premaxilla; N., nasal; M., maxilla; Sq., squamosal; Q.j., quadrato-jugal;…

"Venous system of frog. m., l., Mandibular and lingual; e.j., external jugular; i.j., internal jugular; scp., subscapular; in., innominate; scl., subclavian; br., brachial; m.c., musculo-cutaneous; h.v., hepatic vein; h.p., hepatic portal; a.a., anterior abdominal; r.p., renal-portal; p.v., pelvic; sc., sciatic; f., femoral; i.v.c., inferior vena cava; c., cardiac vein." -Thomson, 1916

Frog Venous System

"Venous system of frog. m., l., Mandibular and lingual; e.j., external jugular; i.j., internal jugular;…

"General view of the viscera of a male frog, from the right side. a, stomach; b, urinary bladder; c, small intestine; cl, cloacal aperture; d, large intestine; e, liver; f, bile duct; g, gall bladder; h, spleen; i, lung; k, larynx; l, fat body; m, testis; n, ureter; o, kidney; p, pancreas; s, cerebral hemisphere; sp, spinal cord; t, tongue; u, auricle; ur, urostyle; v, ventricle; v.s, vesicula seminalis; w, optic lobe; x, cerebellum; y, Eustachian recess; z, nasal sac." -Parker, 1900

Frog Viscera

"General view of the viscera of a male frog, from the right side. a, stomach; b, urinary bladder; c,…

The circulation of the blood in the web of a frog's foot. A, an artery; B, capillaries crowded with disks, owing to a rupture just above, where the disks are jammed into an adjacent mesh; C, a deeper vein; the black spots are pigments cells.

Circulation of Blood in a Frog's Foot

The circulation of the blood in the web of a frog's foot. A, an artery; B, capillaries crowded with…

A diagram showing the motions a young frog makes while swimming. In this stage of life, the frog makes ellipses in order to move through the water.

Ellipses of Swimming Frog

A diagram showing the motions a young frog makes while swimming. In this stage of life, the frog makes…

A diagram showing the motions a young frog makes whilst swimming. In this stage of the frog's life, the frog uses looping motions to move through the water.

Loops of Swimming Frog

A diagram showing the motions a young frog makes whilst swimming. In this stage of the frog's life,…

"The skull in reptiles is flat, and the cerebral cavity is not filled with brains. There are no ribs."

Skeleton of a Frog

"The skull in reptiles is flat, and the cerebral cavity is not filled with brains. There are no ribs."

A diagram demonstrating the motion a frog makes whilst swimming. In this stage of the frog's life, the frog makes waved lines while moving through the water.

Swim Lines of Frog

A diagram demonstrating the motion a frog makes whilst swimming. In this stage of the frog's life, the…

The heart of a frog (Rana esculenta) from the front. Labels: V, ventricle, Ad, right auricle; As, left auricle; B, bulbus arteriosus, dividing into right and left aorta.

Heart of a Frog

The heart of a frog (Rana esculenta) from the front. Labels: V, ventricle, Ad, right auricle; As, left…

The heart of a frog (Rana esculenta) from the back. Labels: s.v., sinus venosus opened; c.s.s., left vena cava superior; c.s.d., right vena cava superior; c.i., vena cava inferior; v.p., vena pulmonales; A.d., right auricle; A.s., left auricle; A.p., opening of communication between the right auricle and the sinus venosus.

Heart of a Frog

The heart of a frog (Rana esculenta) from the back. Labels: s.v., sinus venosus opened; c.s.s., left…

Course of the nerves in the auricular partition wall of the heart of a frog. Labels: d, dorsal branch; v, ventral branch.

Nerves of the Heart of a Frog

Course of the nerves in the auricular partition wall of the heart of a frog. Labels: d, dorsal branch;…

African dwarf frogs of genus Hymenochirus, also known as dwarf aquatic frogs, are frogs native to Sub Saharan Africa. Pictured here in the vertebral column.

Vertebral Column of Hymenochirus

African dwarf frogs of genus Hymenochirus, also known as dwarf aquatic frogs, are frogs native to Sub…

Ichthyophis glutinosus or Ceylon Caecilian is a species of amphibian in the Ichthyophiidae family. Pictured here is the ventral view of the head and trunk.

Head of Ichthyophis Glutinosus

Ichthyophis glutinosus or Ceylon Caecilian is a species of amphibian in the Ichthyophiidae family. Pictured…

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern United States, and parts of Canada. Pictured here is the hyoid and branchial apparatus

Hyoid and Branchial Apparatus of the Common Mudpuppy

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern…

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern United States, and parts of Canada. Pictured here is the dorsal view of the cranium.

Cranium of the Common Mudpuppy (Dorsal View)

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern…

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern United States, and parts of Canada. Pictured here is the lateral view of the cranium.

Cranium of the Common Mudpuppy (Lateral View)

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern…

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern United States, and parts of Canada. Pictured here is the ventral view of the cranium.

Cranium of the Common Mudpuppy (Ventral View)

The Common Mudpuppy (Necturus maculosus) is a species of aquatic salamander found throughout the northeastern…

Two striped muscle fibers of the hyoglossus of frog. Labels: a, Nerve end plate; b, nerve fibers leaving the end plate; c, nerve fibers, terminating after diving into branches d, a nucleus in which two nerve fibers anastomose.

Striped Muscle Fibers of a Frog

Two striped muscle fibers of the hyoglossus of frog. Labels: a, Nerve end plate; b, nerve fibers leaving…

A nerve fiber from a frog.

Nerve Fiber from Frog

A nerve fiber from a frog.

Small branch of a muscular nerve of the frog, near its termination, showing division of the fibers. Labels: a, into two; b, into three.

Muscular Nerve Showing Division of Fiber

Small branch of a muscular nerve of the frog, near its termination, showing division of the fibers.…

Ramifications of nerves and termination in muscular coat of a small artery of the frog.

Nerves in the Artery of a Frog

Ramifications of nerves and termination in muscular coat of a small artery of the frog.

This illustration represents a skeleton of another species of ancient amphibian reptiles.

Raniceps Lyellii

This illustration represents a skeleton of another species of ancient amphibian reptiles.

Amphibian Reptiles occur through the age. They are called Labyrinthodonts, because the teeth, like those of the Ganoids, are labyrinthine in the arrangement of the dentine. The earliest traces are tracks found in the Subcarboniferous beds at Pottsville, Pa.; they are about four inches broad.

Sauropus Primaevus

Amphibian Reptiles occur through the age. They are called Labyrinthodonts, because the teeth, like those…