Outline 3: NS Flashcards
Number of Spinal Nerve pairs
31
Glia functions
- Support, nourish, protect cell 2. Mop up excess K+ (maintain extracellular environment) 3. Signaling
Types of neurons
Afferent, Efferent, Interneurons
Efferent neurons are:
Motor neurons
Efferent neurons have their bodies in…
CNS
Afferent neurons are:
Sensory neurons
Afferent neurons have their bodies in…
PNS
Axons of CNS
White matter
Axons of PNS
Nerves
Cell bodies of CNS
Gray matter
Cell bodies of PNS
Ganglia
Number of Cranial Nerve pairs
12
Connective tissue enclosing CNS
Meninges
Order of meninges (outermost to innermost)
Dura mater, arachnoid, pia mater
CSF travels in the…
Subarachnoid space
Functions of CSF
- Reduces brain weight (by 93%) 2. Cushions/shock absorption
Spinal cord functions
- Major reflex center 2. Major conduction pathway between brain and body
Spinal cord extends from (X) to (Y).
X = foramen magnum Y = L1-L2
Spinal cord travels in…
Vertebral canal
Spinal cord protected by…
Bone, ligaments, meninges, CSF
Name the two spinal cord segmental enlargements
- Brachial/cervical enlargement 2. Lumbosacral enlargement
Bundles of neuron axons in PNS
Nerves
The end of the spinal cord is termed:
Conus medullaris
The conus medullaris is present around which spinal processes?
L1/L2
