Coz

Gastrula

Neurula

Organogenesis

Ectoderm

Epidermal ' ectoderm

Neural plate ectoderm

Epidermis

Epidermis

Epidermal ' ectoderm

Neural plate ectoderm

' Neural tube

Neural crest ectoderm

< Ganglionic neural crest Ectomesenchyme Visceral skeleton

Telencephalon

Diencephalon

Mesencephalon

Myelencephalon-

Metencephalon

Spinal cord

Epidermis Mouth

Cloacal opening

Cerebral hemispheres Thalamus Optic lobes Cerebellum Medulla oblongata Spinal cord

Epimere

Mesomere Mesoderm (intermediate mesoderm)

^ Hypomere (lateral plate)

Somite

Nephrotome

Dermatome

Myotome

Sclerotome

Nephrotome

Pronephric tubules v.

Pronephric duct ---Kidney and

Mesonephric tubuje^^^ urogenital ducts Renal cortex

Somatic hypomere

Splanchnic hypomere

Limb bud

Parietal peritoneum Genital ridge

Blood vascular Mesentery Extraembryonic membranes

Dermis

Body musculation Vertebral column

Pronephric tubules v.

Pronephric duct ---Kidney and

Mesonephric tubuje^^^ urogenital ducts Renal cortex

Limbs

Peritoneum

Gonads

- Heart, vessels Mesenteries

Foregut

Endoderm Midgut

Pharynx

Posterior foregut

Midgut

Pharynx

Posterior foregut

Midgut

Liver diverticulum

Pancreas -

Intestine

Hindgut

Hindgut

Oral and nasal cavities and derivatives Pharyngeal pouches Esophagus Lung buds Stomach

Liver diverticulum

Pancreas -

Intestine

Allantois

Urogenital sinus Figure 8-3. Continued

Esophagus Tracheal tube Stomach Liver Pancreas

Small and large intestines

Urinary bladder Cloaca

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