unit 5: spinal nerves, cervical plexus Flashcards
the cervical plexus is formed by ANTERIOR primary rami of:
C1-C4 spinal nerves
the nerve roots of the plexus form a series of communicating loops that communicate with these three CRANIAL nerves:
X (vagus)
XI (hypoglossal)
XII (accessory)
fibers from the inferior vagal ganglion communicate w/ the loop formed by
-vagus n. communication
C1 & C2
fibers from the spinal accessory n. carry proprioceptive info and communicate w/ the loop formed by (2 pairs):
C2 & C3
C3 & C4
in regards to the spinal accessory nerve, proprioceptive info is sent from the ____ to C2, and from _____ to C3 & C4
SCM
trapezius
the hypoglossal nerve communicates with __ fibers that later separate to become the:
C1
superior root of ansa cervicalis
C1 fibers that supply ___ & __ remain WITH the hypoglossal nerve (do not become ansa cervicalis)
thyrohyoid
geniohyoid
three gray rami communicans that carry postganglionic SYMPATHETIC fibers
vasomotor (VC/VD, BP)
sudomotor (increase sweat gland output)
pilomotor (erector pili, raise hair)
the loop between these two root pairs communicate with the gray rami communicans
C1 & C2
C3 & C4
LESSER OCCIPITAL nerve carries C2 fibers to supply:
superior 1/3 of auricle skin
skin behind ear
lesser occipital nerve communicates with these two nerves
greater occipital
great auricular
GREAT AURICULAR nerve carries fibers from __&__, and enters the ___ gland to divide into anterior and posterior branches
C2 & C3
parotid
the ___ branch of the great auricular nerve combines with the __ nerve to supply the skin over the parotid gland
anterior
facial
the ___ branch of the great auricular nerve supplies the skin over the mastoid process
posterior
TRANSVERSE CUTANEOUS nerve of the neck carries fibers from:
C2 & C3
the transverse cutaneous nerve of the neck divides into ascending & descending branches, that both supply the:
skin over platysma muscle
the trunks from __&__combine to form a trunk that gives rise to the medial, intermediate, & lateral SUPRACLAVICULAR nerves
C3 & C4
the MEDIAL supraclavicular nerve supplies the skin INFERIOR to the
sternal end of clavicle (as far inferior as rib 2)
the INTERMEDIATE supraclavicular nerve supplies the skin over the
deltoid & pec major (as far inferior as rib 2)
the LATERAL supraclavicular nerve supplies skin over the
superior & lateral aspects of the shoulder
the 3 superficial branches of the cervical plexus
lesser occipital
greater auricular
transverse cutaneous of the neck
the DEEP branches of the CP are divided into a __ & __ series
medial
lateral
the (deep) LATERAL series of the CP passes into the posterior triangle and consists of ___ branches and __ branches
communicating
muscular
within the lateral series, the __ __ nerve may receive communicating branches carrying sensory fibers from__-__
spinal accessory
C2-C4
four muscles associated with the muscular branches of the lateral series
SCM
traps
levator scapula
middle scalene
SCM receives proprioception from ___-___ and trapezius from ___
-deep lateral series muscular branches
C2-C4
C2 (perhaps C3)
levator scapula (motor AND sensory) and middle scalene (motor only) are both innervated by __&__
C3 & C4
the (deep) MEDIAL series passes into the ___ triangle & like the lateral series has both communicating and muscular branches in addition to the phrenic nerve
anterior
- bt vagus & loop bt C1 & C2
- 3-4 gray rami communicans from sup cervical ganglion to upper 4 cervical nerves
- fibers from C1 comm. w/ hypoglossal then separating to form sup root of ansa cervicalis
- -these are all:
communicating branches of the (deep) medial series
muscles supplied by the medial series muscular branches
rectus capitis lateralis
rectus capitis anterior
longus capitis
longus colli
branches that supply these muscles respectively: rectus capitis lateralis: rectus capitis anterior: longus capitis: longus colli:
C1
C1, C2
C1-C3
C2-C4
within the medial series, branches from __ & __ combine to form the ___ root of the ansa cervicalis
C2 & C3
inferior
muscles supplied by ansa cervicalis
sternohyoid
sternothyroid
omohyoid (both bellies)
the ____ nerve is formed by C3, C4, & C5, and descends thru the neck, anterior to the __ __ muscle
phrenic
anterior scalene
the phrenic nerve receives POSTganglionic sympathetic fibers from the ___ ganglia, and is the nerve supply to the ___
cervical
diaphragm
