EMBRYOLOGY

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Mussel embryology (Lamellibranchiata, Bivalvia or Pelecypoda). Unfertilized and fertilized ova w.m.

Mussel embryology. Blastula w.m.

Mussel embryology. Early zygote through late cleavage. Polar bodies, polar lobes and spiral cleavage

Mussel embryology. Gastrula w.m.

Mussel embryology. Glochidia larva w.m.

Mussel embryology. Trochophore larva w.m.

Mussel embryology. Veliger larva w.m.

Mussel embryology. Veliger larvae, early and later stages

Mussel embryology. Zygote, two-cell and four-cell embryos w.m.

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Acheta, cricket, egg showing maturation division w.m.

Acheta, superficial cleavage

Acheta, superficial cleavage, nuclei migrating to surface

Acheta, w.m. of egg showing formation of germ layer

Acheta, w.m. of egg showing rolling out of the germ

Acheta, w.m. of egg shows early blastokinesis, germ starts to roll in

Acheta, w.m. of egg shows late blastokinesis, germ with limb buds

Acheta, w.m. of egg with young germ

Acheta. first cleavage w.m.

Carausius, sagittal l.s. of egg with early germ

Carausius, sagittal l.s. of egg with germ ready for hatching

Carausius, sagittal l.s. of egg with later germ

Carausius, sagittal l.s. of egg with medium germ

Carausius, walking stick, w.m. of germ with primordium of head, limb buds, neural groove, coelom

Insect, t.s. of egg showing formation of amnion and serosa

Insect, t.s. of egg showing fusion of the embryonic envelopes

Insect, t.s. of egg showing nuclei migrating to surface, cleavage

Insect, t.s. of egg showing superficial cleavage in the blastoderm

Insect, t.s. of egg showing young germ with primitive streak

Insect, t.s. of older germ in region of head

Insect, t.s. of older germ showing process of differentiation in ectoderm and mesoderm

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Sea-urchin embryology (Psammechinus miliaris), unfertilized eggs w.m.

Sea-urchin embryology. Beginning gastrulation w.m.

Sea-urchin embryology. Blastula w.m.

Sea-urchin embryology. Eight cells w.m.

Sea-urchin embryology. Fertilized eggs w.m.

Sea-urchin embryology. Four cells w.m.

Sea-urchin embryology. Morula w.m.

Sea-urchin embryology. Pluteus larva w.m.

Sea-urchin embryology. Progressive gastrulation w.m.

Sea-urchin embryology. Sixteen cells w.m.

Sea-urchin embryology. Thirty two cells w.m.

Sea-urchin embryology. Two cells w.m.

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Starfish embryology (Asterias rubens). Ovary t.s. showing ova of large size

Starfish embryology. Brachiolaria larva w.m.

Starfish embryology. Early and late blastula w.m.

Starfish embryology. Early and late gastrula w.m.

Starfish embryology. Early bipinnaria larva w.m.

Starfish embryology. Eight cell stage w.m.

Starfish embryology. Fertilized ova w.m. Zygote with polar bodies

Starfish embryology. Four cell stage w.m.

Starfish embryology. Germinal vesicle stage w.m.

Starfish embryology. Late bipinnaria larva w.m.

Starfish embryology. Sixteen cell stage w.m.

Starfish embryology. Sixty-four cell stage w.m.

Starfish embryology. Sperm smear

Starfish embryology. Testis t.s. with developing sperm

Starfish embryology. Thirty-two cell stage w.m.

Starfish embryology. Two cell stage w.m.

Starfish embryology. Unfertilized ova w.m.

Starfish embryology. Young starfish w.m.

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Branchiostoma embryology. Blastula stage w.m.

Branchiostoma embryology. Early larva w.m.

Branchiostoma embryology. Gastrula stage w.m.

Branchiostoma embryology. Late larva w.m.

Branchiostoma embryology. Thirty-two and sixty-four cells stage, w.m

Branchiostoma embryology. Two to sixteen cells stage w.m.

Branchiostoma embryology. Unfertilized ova w.m.

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Frog, blastula l.s. showing blastocoel

Frog, early gastrula, sagittal l.s. shows formation of germ layers and dorsal lip

Frog, early neurula, t.s. shows the neural plate

Frog, early tail bud stage, near median sagittal l.s. with forebrain, neural tube, notochord, digestive tract

Frog, early tail bud stage, sagittal l.s.

Frog, early tail bud stage, t.s. of body region

Frog, early tail bud stage, t.s. of head region

Frog, egg, eight cells (third cleavage) l.s.

Frog, egg, four cells (second cleavage) t.s.

Frog, egg, sixteen cells l.s.

Frog, egg, two cells (first cleavage) l.s.

Frog, hatching stage, sagittal l.s.

Frog, hatching stage, t.s. of head with developing eyes

Frog, hatching stage, t.s. of midbody

Frog, hatching stage, t.s. through region of heart, gills

Frog, late neurula with neural tube, sagittal l.s.

Frog, late neurula with neural tube, t.s. through the frontal region

Frog, late neurula with neural tube, t.s. through the intestinal region

Frog, late tail bud stage, frontal l.s. with differentiation of coelom sacs

Frog, late tail bud stage, t.s. in region of pronephros

Frog, late tail bud stage, t.s. of body region with processes of differentiation in mesoderm

Frog, late tail bud stage, t.s. of head region

Frog, later gastrula (yolk plug stage), sagittal l.s. with germ layers, yolk plug, blastocoel, primary intestinal cavity

Frog, medium neurula, t.s. shows the neural groove

Frog, morula l.s. with micro- and macromeres

Frog, older tadpole, sagittal sec.

Fro g, older tadpole, section through limb bud

Frog, older tadpole, t.s. in region of heart and lungs

Frog, older tadpole, t.s. of abdomen

Frog, older tadpole, t.s. of gill region

Frog, older tadpole, t.s. of head

Frog, uncleaved egg, t.s.

Frog, young tadpole, frontal (horizontal) sec.

Frog, young tadpole, sagittal sec.

Frog, young tadpole, t.s. of abdomen

Frog, young tadpole, t.s. of gill region

Frog, young tadpole, t.s. of head

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Chicken, 12 – 24 hour, l.s. through primitive streak

Chicken, 12 – 24 hour, t.s. with neural plate

Chicken, 12 hour, t.s. through primitive streak

Chicken, 16 hour, w.m. showing primitive streak

Chicken, 18 hour, w.m.

Chicken, 21 hour, w.m.

Chicken, 24 hour, l.s.

Chicken, 24 hour, t.s. head fold region t.s.

Chicken, 24 hour, t.s. intestinal region

Chicken, 24 hour, t.s. pericardial region t.s.

Chicken, 24 hour, t.s. with neural groove, notochord, germinal layers, somites

Chicken, 24 hour, w.m. showing neural groove

Chicken, 28 hour, w.m. showing heart and blood vessels

Chicken, 33 hour, w.m. formation of the somites

Chicken, 36 – 48 hour, sagittal l.s., formation of the somites

Chicken, 36 hour, t.s. of anterior region with developing heart (pericardial region)

Chicken, 36 hour, t.s. with neural tube, notochord, differentiation of mesoderm (myotom, nephrotom and splanchnotom)

Chicken, 40 hour, w.m. flexion of the anterior end

Chicken, 43 hour, w.m.

Chicken, 48 – 60 hour, horizontal l.s. with brain, heart, and somites

Chicken, 48 hour, sagittal l.s. through primitive node, formation of coelom, Vena terminalis

Chicken, 48 hour, t.s. of head

Chicken, 48 hour, t.s. showing neural tube, mesoderm

Chicken. 48 hour, t.s. region of heart

Chicken, 48 hour, w.m. formation of the coelom

Chicken, 56 hour, w.m. gill arches can be seen

Chicken, 60 hour, t.s. of abdominal region

Chicken, 60 hour, t.s. of head

Chicken, 60 hour, t.s. of heart

Chicken, 66 hour, w.m. progression of gill arches and other structures

Chicken, 72 hour, horizontal l.s.

Chicken, 72 hour, t.s. in abdominal region

Chicken, 72 hour, t.s. in caudal region of heart

Chicken, 72 hour, t.s. in region of heart and eyes

Chicken, 72 hour, t.s. of brain

Chicken, 72 hour, w.m. with well developed limb buds

Chicken, 4 – 5 days, sagittal l.s.

Chicken, 4 – 5 days, t.s. in abdominal region

Chicken, 4 – 5 days, t.s. in region of heart and eyes

Chicken, 4 – 5 days, t.s. of head

Chicken, 8 days, sagittal l.s. of entire specimen

Chicken, 8 days, t.s. in region of gill slits

Chicken, 8 days, t.s. in region of heart and lungs

Chicken, 8 days, t.s. in region of intestine and kidney

Chicken, 8 days, t.s. in region of intestine and liver

Chicken, 8 days, t.s. of brain

Chicken, 8 days, t.s. through eyes

Chicken, 80 hour. w.m. more advanced stage of organ development

Chicken, 96 hour, w.m. allantois outside the body

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Pig embryo, 4 mm, sagittal l.s.

Pig embryo, 4 mm, typical t.s.

Pig embryo, 6 mm, sagittal l.s.

Pig embryo, 6 mm, typical t.s.

Pig embryo, 8 mm, sagittal l.s.

Pig embryo, 8 mm, typical t.s.

Pig embryos, 6, 8, and 11 mm, three typical sagittal l.s.

Pig embryos, 6, 8, and 11 mm, three typical t.s.

Pig embryo, 11 – 12 mm, frontal l.s.

Pig embryo, 11 – 12 mm, near median sagittal l.s.

Pig embryo, 11 – 12 mm, sagittal l.s.

Pig embryo, 11 – 12 mm, three typical t.s. through head, thorax and abdomen

Pig embryo, 11 – 12 mm, typical t.s.

Pig embryo, 15 mm, abdomen t.s.

Pig embryo, 15 mm, frontal l.s.

Pig embryo, 15 mm, head t.s.

Pig embryo, 15 mm, near median l.s.

Pig embryo, 15 mm, sagittal l.s.

Pig embryo, 15 mm, thorax t.s.

Pig embryo, 15 mm, three typical t.s. through head, thorax, and abdomen

Pig embryo, 20 – 25 mm, abdomen t.s.

Pig embryo, 20 – 25 mm, frontal l.s.

Pig embryo, 20 – 25 mm, head t.s.

Pig embryo, 20 – 25 mm, near median sagittal l.s.

Pig embryo, 20 – 25 mm, sagittal l.s.

Pig embryo, 20 – 25 mm, thorax t.s.

Pig embryo, 20 – 25 mm, three typical t.s. through head, thorax, and abdomen

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Ascaris megalocephala embryology. Sec. of uteri showing early cleavage stages (mitosis)

Ascaris megalocephala embryology. Sec. of uteri showing entrance and modification of sperm in ova

Ascaris megalocephala embryology. Sec. of uteri showing later cleavage stages (mitosis)

Ascaris megalocephala embryology. Sec. of uteri showing ova with male and female pronuclei

Ascaris megalocephala embryology. Sec.of uteri showing maturation stages (meiosis). Polar bodies seen