development of the nervous system and special senses
DESCRIPTION
SYSTERMIC EMBRYOLOGY Development of the Nervous System and Special SensesTRANSCRIPT
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SYSTERMIC EMBRYOLOGY Development of the Nervous System and Special
SensesPRESENTATION
BY
DR. ABDULRAHMAN BELLO (DVM , MSc)
Department of Veterinary Anatomy, Faculty of Veterinary Medicine, Usmanu Danfodiyo University,
Sokoto, Nigeria.
E-mail:[email protected]. +234(0)8039687589.
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Development of the Nervous System and Special Senses
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Neurulation• The notochord induces overlaying ectoderm to become neuroectoderm
and form a neural tube. The following stages of neural tube formation are evident:
• neural plate—Ectodermal cells overlaying the notochord become tall columnar, producing a thickened neural plate (in contrast to
surrounding ectoderm that produces epidermis of skin).
• neural groove—the neural plate is transformed into a neural groove.
• neural tube—The dorsal margins of the neural groove merge medially, forming a neural tube composed of columnar neuroepithelial cells surrounding a neural cavity.
• In the process of separating from overlaying ectoderm, some neural plate cells become detached from the tube and collect bilateral to it, forming neural crest.
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Neurulation
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Digestive System
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SIMPLE STOMACH DEVELOPMENT
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RECTUM