sensory innervation and veins of head and neck Flashcards Preview

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Flashcards in sensory innervation and veins of head and neck Deck (26)
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1
Q

the sensory information from the posterior neck and scalp is from?

A

dorsal primary rami of C2-4

2
Q

what nerve is the posterior primary ramus of C2?

A

greater occipital nerve

3
Q

what does the greater occipital nerve supply?

A

occipital region

4
Q

what nerve is the posterior primary ramus of C3?

A

third occipital nerve

5
Q

what does the third occipital nerve supply?

A

upper part of back of neck

6
Q

what does the posterior primary ramus of C4 supply?

A

lower part of back of neck

7
Q

which posterior root has no sensory fibers only motor?

A

C1

8
Q

what forms the cervical plexus?

A

ANTERIOR primary rami of C1-4

9
Q

what are the 4 sensory branches of the cervical plexus?

A

lesser occipital nerve C2
great auricular nerve C2,3
transverse cervical nerve C2,3
supraclavicular nerve C3,4

learning good takes studying

10
Q

what are the 3 branches of the supraclavicular nerve?

A

medial, intermediate and lateral supraclavicular

11
Q

where does the cervical plexus carry motor fibers to?

A

infrahyoid muscles

12
Q

where do the motor fibers of the cervical plexus arise from?

A

ansa cervicalis

13
Q

what are the 2 parts of the ansa cervicalis?

A

superior root- C1-3

inferior root- C2-3

14
Q

what does the ansa cervicalis C1-3 supply?

A

3 of the 4 infrahyoid muscles:

sternohyoid, sternothyroid and omohyoid

15
Q

what does the 4th infrahyoid muscle, thyrohyoid receive its innervation from?

A

C1 fibers through the hypoglossal nerve

16
Q

what is the other nerve that is usually considered to be a part of the cervical plexus?

A

phrenic nerve- it originates from C3, 4, 5

17
Q

what type of nerve is the phrenic nerve?

A

mixed-both sensory and motor

18
Q

where does the phrenic nerve carry its motor and sensory nerve fibers to?

A

motor- diaphragm

sensory- membranes of thorax and abdomen

19
Q

which muscle does the phrenic nerve lie anterior to?

A

anterior scalene muscle

20
Q

what is the largest and only vein on the external SCM?

A

external jugular vein

21
Q

what is the function of the external jugular vein?

A

drain the face and scalp and contain a large amount of cerebral blood

22
Q

what 2 veins come together to form the external jugular vein?

A

retromandibular
posterior auricular

below the parotid gland

23
Q

where does the external jugular vein run?

A

down and back along the lateral surface of the SCM

24
Q

where does the external jugular vein empty?

A

subclavian vein

25
Q

what are the 6 tributaries of the external jugular vein?

A
suprascapular
transverse cervical
anterior jugular
retromandibular
posterior auricular
posterior external jugular

STARPP

26
Q

what other structure is found along the external jugular vein superficial to the SCM?

A

superficial cervical lymph nodes