Chapter 6 - Nervous Sys- Part 3 Flashcards
Cranial nerves, spinal nerves, ganglia, and sensory receptor are all——–
PNS (Peripheral Nervous System)
Paths of communication between the brain and the periphery called ——
Cranial nerves
————-has 12 pairs of nerves that exit from the ——–of the brain.
cranial nerves
base
————-paths of communication between the SC and the periphery.
Spinal nerves
There are ——–pairs of Spinal nerves (C1-C7, T1-T12, L1-L5, S1-S5), they are numbered according to the region and level of the vertebral column which they emerge.
31
Spinal nerves connect the SC to : 1.---------------- 2.--------------- 3. -------------- in all part of the body
- receptors
- muscles
- glands
parallel bundles of axons (and their associated neuroglial cell) wrapped in several layers of CT called ———-
Spinal Nerves
In the Spinal nerves, the 1st pair of cervical nerves emerges from the spinal cord between the —————-and the—————–
base of the skull
1st cervical vertebrae (a.k.a atlas)
In Spinal nerve ,
C1- —exit the spine above their corresponding vertebrae
C7
In Spinal nerves,
—–exits between C7 and T1 vertebrae
C8
T1- —–exit below their corresponding vertebrae
L5
————-not all are aligned with their corresponding vertebrae -lumbar, sacral, and coccygeal nerves descend from ——to their respective levels.
Spinal Nerves
L2
All of the nervous tissues outside the CNS called ———
Peripheral nervous system
spinal nerves
2 bundles of axons that connect the spinal nerve to the SC called
nerve root
spinal nerves
———a bundle of motor axons
anterior root (ventral)
spinal nerves
——-a bundle of sensory axons
posterior root (aka dorsal)
spinal nerves
a swelling in the posterior root containing cell bodies of sensory neurons of the PNS called ——-
Posterior/dorsal root ganglion
aka unipolar, primary afferent
What are the connective tissue of a spinal nerve ?
- Endoneurium
- Perineurium
- Epinerium
connective tissues of the spinal nerve
———–inner most, covers the axon (whether it’s myelinated or not), highly vascularized
endoneurium
——–middle layer, covers fascicles (bundles of axons), Highly vascularized
perineurium
What are the subdivisions of the PNS ?
- Somatic NS (SNS)
- Autonomic NS (ANS)
- Enteric NS (ENS)
SNS stands for ————–
Somatic nervous system