unit 5: spinal nerves, intro Flashcards
pairs of spinal nerves, which attach to the spinal cord
31
__ cervical nerve pairs, __ thoracic, ___ lumbar, ___sacral, __ coccygeal nerve pair
8 12 5 5 1
the spinal nerves split into a strictly MOTOR ____ root and a SENSORY only ____ root
anterior
posterior
a ramus differs from a root/rootlet because a ramus carries _____ info
mixed
ANTerior spinal roots carry EFFERENT axons from CB in the ___ or ____ horns, and are attached to the SC by a series of rootlets
anterior
lateral
POSTerior spinal roots carry axons from CB in the ____ ____ ____ ganglion
dorsal (posterior) root spinal ganglion
the posterior root separates into a number of rootlets that attach to the cord at the ___ ___
posterolateral sulcus
spinal ganglia are usually found inside or just MEDIAL to the ____, beyond the dura mater
IVF
three exceptions of spinal ganglion locations are:
- C1/C2 ganglia are on their respective ___ ____
- sacral ganglia are WITHIN the ___ ____
- coccygeal ganglia is located INSIDE ___ ___
vertebral arches
vertebral canal
dura mater
after combining into a mixed spinal nerve, a _____ branch is given off, which is present at all spinal levels
meningeal
the meningeal branch reenters the vert canal thru the IVF & divides into ___, ___, & ____ branches
ascending
descending
transverse
the meningeal branch provides SOMATOSENSORY & postganglionic SYMPATHETIC supply to the ____ (5 things) in the anterior & lateral parts of the canal
dura BV periosteum ligaments IVD
the mixed spinal nerve divides into two (primary) rami: ___ & ____
posterior
anterior
the _____ ramus splits into lateral & medial branches (except C1)
posterior
the posterior ramus is smaller than the anterior ramus except at:
C1
S4
S5
the POSTERIOR ramus lends ___ innervation to the deep back muscles and ____ to the skin on either side of the spine
motor
sensory
the ANTERIOR ramus lends motor innervation to the ___ & ___ ___ muscles as well as the skeletal muscles of the ___
anterior & lateral trunk
extremities
____ rami contribute to the great plexuses
anterior
anterior ramus lends sensory innervation to the skin of the ____ as well as the ___ & ___ ___
extremities
anterior & lateral trunk
these are located either at or just medial to the bifurcation of the mixed spinal nerve
sympathetic chain communicans
__ __ ___ carries MYELINATED axons from CB in the LATERAL horn cells at T1-L2
white ramus communicans
in the white ramus communicans, ___ ___ fibers enter the sympathetic chain and:
- synapse at that level or ____/____
- pass through to the ____
preganglionic sympathetic
ascend/descend
splanchnic
WHITE rami communicans are associated only with nerves __-__
T1-L2
__ __ ___ carries UNMYELINATED POSTganglionic sympathetic axons from CB in the sympathetic chain TO the spinal nerve
gray ramus communicans
GRAY rami communicans are associated with these spinal nerves:
all spinal nerves
