Exam 2 - Spinal nerves, introduction, cervical plexus pt. 1

how many cervical spinal nerve pairs are there

8

how many thoracic spinal nerve pairs are there

12

how many lumbar spinal nerve pairs are there

5

how many sacral spinal nerve pairs are there

5

how many coccygeal spinal nerve pairs are there

1

what do anterior roots contain

efferent info

cell bodies

series of rootlets

where are cell bodies of anterior roots located

lateral horn of anterior horn of gray

what do posterior roots contain

afferent info

rootlets

cell bodies

where are cell bodies of posterior roots located

dorsal root ganglion

where do most fibers of the posterior roots synapse

posterior horn of gray

where are spinal ganglia located

inside or medial to IVF beyond the dura

where are spinal ganglia of CI and C2 located

posterior arches of c1 and c2

where are spinal ganglia of sacral region located

inside the dura

where are spinal ganglia of coccygeal region located

inside dura

the anterior and posterior roots combine to form what nerve

mixed nerve

what is the first branch of the mixed nerve

meningeal branch/recurrent meningeal/sinuvertebral

t/f

only some spinal levels have meningeal branch

false they all do

the meningeal branch re-enters the vertebral canal and splits into what branches

ascending, descending, transverse

the meningeal branch supplies somatosensory and sympathetic supply to what parts of the canal

anterior and lateral

what structures of the meningeal branch supply

dura, bld vessels, periosteum, ligaments, IVD's

does the meningeal branch carry pre or post sympathetics

post

what does the mixed spinal nerve divide into

anterior and posterior primary rami

what does the posterior primary ramus divide into

lateral and medial branches except C1

in what areas is the posterior primary ramus larger than the anterior primary ramus

c1, s4, s5

where does the posterior ramus supply motor innervation to

deep back muscles

where does the posterior ramus supply sensory to

skin on either side of skin

where does anterior primary ramus give motor and sensory supply to

anterior and lateral trunk muscles, skeletal muscles of extremities

which primary ramus makes up the great plexuses

anterior

where are sympathetic chain communications located

at or medial to bifurcation of mixed nerve

what are the two sympathetic chain communications

white ramus communicans

gray ramus communicans

which ramus communicans carries myelinated fibers

white

which ramus communicans carries preganglionic sympathetics

white

which ramus communicans carries unmyelinated, postganglionic fibers

gray

the preganglionic fibers of the white ramus communicans enter the chains and do what

1. synapse in sympathetic chain ganglion

2. go through sympathetic trunk to be incorporated into splanchnic nerves

white ramus communicans are only found at what levels

t1-l2

gray ramus communicans are found at what levels

all

aka of suboccipital nerve

posterior ramus of c1

does the posterior ramus of c1 split

no

does suboccipital nerve carry sensory, motor, or both

motor

what does suboccipital nerve/posterior ramus of c1 supply

rectus capitis posterior

obliquus capitis superior and inferior

semispinalis capitis

what does the posterior ramus of c2 split into

medial and lateral branch

aka of medial branch of posterior ramus c2

greater occipital nerve

what does the medial branch of posterior ramus c2 supply

sensory to posterior neck and scalp

what does lateral branch of posterior ramus c2 supply

motor to:

semispinalis capitis

longissimus capitis

splenius capitis

what does posterior ramus of c3 split into

medial and lateral branch

aka of medial branch of posterior ramus of c3

third/least occipital nerve

what does medial branch of posterior ramus of c3 supply

sensory to posterior neck

what does lateral branch of posterior ramus of c3 supply

motor to

semispinalis capitis

longissimus capitis

splenius capitis

what does the medial branch of posterior rami of c4-c8 supply

sensory to posterior neck

what does lateral branch of posterior rami of c4-c8 supply

motor:

iliocostalis cervicis

longissimus cervicis

longissimus cpaitis