EMBRYOLOGY

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STARFISH, sperm smear showing structure of spermatozoa with unusually long tails

STARFISH TESTIS, section of developing sperm in mature testis

STARFISH OVARY, c.s. of developing mature eggs

STARFISH, w.m. of unfertilized eggs showing the mature eggs

STARFISH POLAR BODY, w.m. of polar body formation

STARFISH EARLY CLEAVAGE, w.m. of eggs showing 1,2,4,8 and 16 cell stages

STARFISH LATE CLEAVAGE, w.m. of eggs showing 32 and 64 cell stages with formation of any early blastocoel

STARFISH MORUL

STARFISH BLASTULA, w.m. of egg showing the large blastocoel

STARFISH EARLY GASTRULA, w.m. of early gastrula showing invagination in different stages

STARFlSH LATE GASTRULA, w.m. of eggs in late gastrula stage

STARFISH BIPINNARIA, w.m. of the free-swimming larva

STARFISH DEVELOPMENT, w.m. of all stages from the unfertilized eggs through bipinnaria stage

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SEA URCHIN SPERM, smear showing structure of spermatozoa with unusually long tails

SEA URCHIN TESTIS, section of developing sperm in mature testis

SEA URCHIN OVARY, c.s. of developing mature eggs

SEA URCHIN UNFERTILIZED EGG, w.m.

SEA URCHIN EARLY CLEAVAGE, w.m. a combination mount of one cell to 16 blastomeres inclusive

SEA URCHIN LATE CLEAVAGE, w.m. 32 and 64 cell stages included

SEA URCHIN BLASTULA, w.m. showing blastocoel clearly

SEA URCHIN EARLY GASTRULA, w.m. of early gastrula showing invagination of cells

SEA URCHIN LATE GASTRULA, w.m.

SEA URCHIN PLUTEUS, w.m.

SEA URCHIN DEVELOPMENT, w.m. of all stages in development through pluteus

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FROG EARLY CLEAVAGE, c.s. showing 4 -16 cells

FROG LATE CLEAVAGE, c.s. showing 32 or 64 cells

FROG EARLY BLASTULA, c.s. showing blastocoel in early formation

FROG LATE BLASTULA, c.s. showing well-formed blastocoel and surrounding cells.

FROG EARLY GASTRULA, l.s. showing the dorsal lip and the beginning of involution

FROG YOLK PLUG, typical gastrula, l.s.demonstrating the stage after the formation of the ventral lip where yolk plug, blastopore, gastrocoele, ectoderm and endoderm are seen.

FROG NEURAL PLATE, c.s. showing medullary plate at an early stage of development

FROG NEURAL FOLD, Sections where neural folds and grooves are quite pronounced.

FROG TRANSITION, c.s. of transition between neuralfold and neural tube

FROG NEURAL TUBE, c.s. showing neural folds completely fused to form the neural tube.

FROG (7 mm), w.m.

FROG (7 mm), Entire specimen sectioned and mounted in series showing stomodium, external gill in this stage.

FROG (7 mm), typical c.s.

FROG (7 mm), serial sagittal section

FROG (7 mm), typical sagittal section (not serial) with representative regions.

FROG (10 mm), w.m.

FROG (10 mm), Internal gill stage. Entire specimen sectioned and mounted in series.

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CHICK UNINCUBATED, w.m.

CHICK (13-16 HRS), c.s. showing primitive streak

CHICK (13-16 HRS), w.m. with primitive steak.

CHICK (18 HRS), w.m. showing the formation of the notochord, Hensen’s node, primitive streak

CHICK (18 HRS), Serial c.s. showing development through the notochord, Hensen’s node and primitive streak.

CHICK (21 HRS), w.m. showing 1-3 somites, formation of head fold, neural groove

CHICK (21 HRS), serial c.s.

CHICK (24 HRS), w.m. showing 4-7 somites prominent neural fold and formation of foregut and paired heart primordia

CHICK (24 HRS), serial c.s.

CHICK (24 HRS), typical c.s.

CHICK (24 HRS), serial sagittal section

CHICK (24 HRS), typical sagittal section

CHICK (28 HRS), w.m. showing 8-10 somites closure of neural groove, differentiation of head region, three primary brain vesicles

CHICK (28 HRS), serial c.s

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CHICK (33 HRS), w.m. showing 11-14 somites, further differentiation of brain, formation of the heart and of embryonic blood vessels

CHICK (33 HRS), serial c.s.

CHICK (33 HRS), typical c.s.

CHICK (33 HRS), serial sagittal section

CHICK (33 HRS), typical sagittal section

CHICK (36-40 HRS), w.m. showing 15-18 somites, beginning of flexion and torsion in the head region, beginning of blood circulation, appearance of auditory pits.

CHICK (43 HRS), w.m. showing 19-23 somites, further flexion and torsion fold of amnion, mandibular aortic arch, optic cup

CHICK (48 HRS), w.m. showing 24-28 somites, flexion and torsion progressing further caudally, appearance of tail fold of amnion 2-3 aortic arches, optic cup and lens

CHICK (48 HRS), serial c.s.

CHICK (48 HRS), typical c.s.

CHICK (48 HRS), serial sagittal section

CHICK (48 HRS), typical sagittal section

CHICK, showing 29-32 somites, beginning of the cervical flexus three visceral clefts and arches

CHICK (60 HRS), w.m.

CHICK (72 HRS), w.m.

CHICK (72 HRS), serial c.s.

CHICK (72 HRS), typical c.s.

CHICK (72 HRS), serial sagittal section

CHICK (72 HRS), typical sagittal section

CHICK (96 HRS), showing 38-41 somites, torsion completed, considerable increase of size and differentiation of the whole embryo.

CHICK (96 HRS), serial c.s.

CHICK (96 HRS), typical c.s.

CHICK (96 HRS), serial sagittal section

CHICK (96 HRS), typical sagittal section

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PIG (6 MM), whole mount

PIG (6 MM), serial c.s.

PIG (6 MM), typical c.s.

PIG (6 MM), serial sagittal section

PIG (6 MM), typical sagittal section

PIG (10 MM), whole mount

PIG (10 MM), serial cross section

PIG (10 MM), typical cross section

PIG (10 MM), serial sagittal section

PIG (10 MM), typical sagittal section

PIG (10 MM), whole mount of head

PIG (15 MM), serial cross section

PIG (15 MM), spaced serial cross section

PIG (15 MM), typical sagittal section

PIG (15 MM), spaced serial sagittal section

PIG (20 MM), spaced serial c.s.