sensory innervation and veins of head and neck Flashcards
the sensory information from the posterior neck and scalp is from?
dorsal primary rami of C2-4
what nerve is the posterior primary ramus of C2?
greater occipital nerve
what does the greater occipital nerve supply?
occipital region
what nerve is the posterior primary ramus of C3?
third occipital nerve
what does the third occipital nerve supply?
upper part of back of neck
what does the posterior primary ramus of C4 supply?
lower part of back of neck
which posterior root has no sensory fibers only motor?
C1
what forms the cervical plexus?
ANTERIOR primary rami of C1-4
what are the 4 sensory branches of the cervical plexus?
lesser occipital nerve C2
great auricular nerve C2,3
transverse cervical nerve C2,3
supraclavicular nerve C3,4
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what are the 3 branches of the supraclavicular nerve?
medial, intermediate and lateral supraclavicular
where does the cervical plexus carry motor fibers to?
infrahyoid muscles
where do the motor fibers of the cervical plexus arise from?
ansa cervicalis
what are the 2 parts of the ansa cervicalis?
superior root- C1-3
inferior root- C2-3
what does the ansa cervicalis C1-3 supply?
3 of the 4 infrahyoid muscles:
sternohyoid, sternothyroid and omohyoid
what does the 4th infrahyoid muscle, thyrohyoid receive its innervation from?
C1 fibers through the hypoglossal nerve
what is the other nerve that is usually considered to be a part of the cervical plexus?
phrenic nerve- it originates from C3, 4, 5
what type of nerve is the phrenic nerve?
mixed-both sensory and motor
where does the phrenic nerve carry its motor and sensory nerve fibers to?
motor- diaphragm
sensory- membranes of thorax and abdomen
which muscle does the phrenic nerve lie anterior to?
anterior scalene muscle
what is the largest and only vein on the external SCM?
external jugular vein
what is the function of the external jugular vein?
drain the face and scalp and contain a large amount of cerebral blood
what 2 veins come together to form the external jugular vein?
retromandibular
posterior auricular
below the parotid gland
where does the external jugular vein run?
down and back along the lateral surface of the SCM
where does the external jugular vein empty?
subclavian vein
what are the 6 tributaries of the external jugular vein?
suprascapular transverse cervical anterior jugular retromandibular posterior auricular posterior external jugular
STARPP
what other structure is found along the external jugular vein superficial to the SCM?
superficial cervical lymph nodes
