spinal cord location function. meninges (for cns) meninx primitiva – protective covering in fish...
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Spinal Cord
Location Function
Meninges (for CNS)
Meninx Primitiva – protective covering in fish
Leptomeninx, - thin inner membrane in higher vertebrates
Dura Mater – outer thick membrane in higher vertebrates
Meninges
Leptomeninx splits in mammals only, into:Pia mater – innerArachnoid – middleSubarachnoid space contains Cerebrospinal
fluid
Key Points
Why is meningitis a life-threatening disease?
Spinal cord
Gray matter contains nuclei, nonmyelinated neurons, at center of spinal cord
White matter contains myelinated ascending and descending tracts, at peripheral spinal cord
Spinal Nerves
Show metamerism & carry information to & from spinal cord
Cauda equina – caudal-most set of spinal nerves resembling a horse’s tail
Spinal Nerves
Occipitospinal nerves– In anamniotes– Innervate hypobranchial muscles– Motor only
Spinal Nerves
Spinal nerves are mixed nerves with:Dorsal root carrying sensory informationVentral root carrying motor information
Key Points
Are spinal nerves CNS or PNS?
Spinal Nerves
Spinal nerves branch into dorsal branch supplying epaxial muscles called Dorsal Ramus
And ventral branch supplying hypaxial muscles called Ventral Ramus
Spinal Nerves
Adjacent spinal nerves for networks or plexuses when supplying limbs