Urogenital Ridge

Dorsal root ganglion

Urogenital Folds

Sympathetic ganglion

Developing suprarenal gland

Dorsal root ganglion

Sympathetic ganglion

Developing suprarenal gland

Urogenital Ridge

Preaortic ganglion

Enteric ganglia

Urogenital ridge

Preaortic ganglion

Enteric ganglia

Urogenital ridge

Neural Groove

Figure 19.2 A-C. Transverse sections through successively older embryos showing formation of the neural groove, neural tube, and neural crest. Cells of the neural crest, migrate from the edges of the neural folds and develop into spinal and cranial sensory ganglia (A-C). D. Scanning electron micrograph of a mouse embryo showing the neural tube (NT) and neural crest cells (arrows) migrating from the dorsal region (compare with B and C).

Figure 19.2 A-C. Transverse sections through successively older embryos showing formation of the neural groove, neural tube, and neural crest. Cells of the neural crest, migrate from the edges of the neural folds and develop into spinal and cranial sensory ganglia (A-C). D. Scanning electron micrograph of a mouse embryo showing the neural tube (NT) and neural crest cells (arrows) migrating from the dorsal region (compare with B and C).

Cranial neuropore m" bulge

Otic placode

Cut edge of amnion

Cranial Neuropore

Figure 19.3 A. Dorsal view of a human embryo at approximately day 22. Seven distinct somites are visible on each side of the neural tube. B. Dorsal view of a human embryo at approximately day 23. The nervous system is in connection with the amniotic cavity through the cranial and caudal neuropores. C. Scanning electron micrograph of a mouse embryo at a stage similar to that in A. S, somites.

Cranial neuropore

Otic Placodes Day

Somite

Neural fold

Pericardial. /'

m" bulge

Otic placode

Somite

Neural fold

Pericardial. /'

Cut edge of amnion

Figure 19.3 A. Dorsal view of a human embryo at approximately day 22. Seven distinct somites are visible on each side of the neural tube. B. Dorsal view of a human embryo at approximately day 23. The nervous system is in connection with the amniotic cavity through the cranial and caudal neuropores. C. Scanning electron micrograph of a mouse embryo at a stage similar to that in A. S, somites.

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