Nervous System Flashcards
CNS
Brain & Spinal Cord
PNS
Spinal nerves (31) Cranial Nerves (12)
Somatic
Voluntary
Mucle,
Sesnsation
Development of the Spinal Cord
Nerulation ( starts at 3 weeks)
Neruolation
Notochord, Neural Plate, Neruall fold, Neural tube( nerual crest)
Process where neural plate forms the nerual tube
How do nerual folds form?
Lateral edges of neural plate become elavated
Neural Groove
a depressed mid region
Closure of cranial & caudal neuorpopre
25& 28
Neural Crest cells break off of what?
Nerual plate (epithelial layer of deveolping dorsal neraul tube)
What do the neural cells migrate to?
Mesenchymal cells
WHere to crest cells travel to?
Dorsal root ganglion ANS ganglian Ganglia to CN V, VII, IX, X Schwan cells Meninges Pigment cells MS components of head
Shwan cells are important in?
PNS
Each Schwan cells develop
myelin
Myelin are layers of what?
Layers of lipid and protein
What does Myelin form?
Sheat around some axons