Superficial Neck Flashcards
name the contents of superficial cervical fascia
platysma
superficial nn & vessels
deep cervical fascia forms the ____
carotid sheath
name the 3 layers of deep cervical fascia
investing
pretracheal
prevertebral
function of deep cervical fascia
- limit infection spread
- reduce friction between moving structures & surgical planes
the investing layer of deep cervical fascia surrounds what 2 muscles?
SCM & trapezius
Origin & insertion of platysma
O: fascia overlying pectoralis major & deltoid mm
I: inf border of mandible, skin, & subcutaneous tissues of the lower face
innervation of platysma
facial n (CN VII, cervical branch)
actions of platysma
- draws corners of mouth inferiorly and widens it
- draws skin of neck superiorly when teeth clenched
what facial expressions/emotions involve platysma?
sadness & fright
origin & insertion of sternocleidomastoid
O:
sternal: ant surface of manubrium
clavicular: sup surface of medial 1/3 clavicle
I: lat surface of mastoid process, temporal
lat 1/2 sup nuchal line
innervation of SCM
- CN XI spinal accessory n
- C3 & C4 pain & proprioception
actions of SCM
Unilateral:
- tilt head to same side (lat flex) & rotate so face looks up to opposite side
Bilateral:
- extend neck at atlanto-occipital jt
- flex cervical vertebrae so chin approaches chest
- extend sup cervical vertebrae while flexing inf vertebrae, so chin is protracted w/ head level
- w/ CV fixed, may elevate manubrium & medial ends of clavicles, assisting pump-handle action of deep respiration
what forms the borders of the posterior triangle?
trapezius
SCM
clavicle
name the 2 subdivisions of the posterior triangle
occipital triangle
subclavian triangle
what divides the posterior triangle into its subdivisions?
inferior belly of omohyoid muscle
what forms the borders of the anterior triangle?
SCM
midline
mandible
name the 4 subdivisions of the anterior triangle
- submandibular (digastric) triangle
- submental triangle
- carotid triangle
- muscular triangle
in general, what innervates the superficial neck?
cervical plexus
what nerves exit at Erb’s point (nerve point of the neck)?
- lesser occipital (C2)
- great auricular (C2 & C3)
- transverse cervical (C2 & C3)
- supraclavicular nn (medial, intermediate, lateral; C3 & C4)
the cervical plexus is composed of ____ rami of ____
ventral
C1-C4
(cutaneous branches)
what artery may be seen in the superficial neck?
transverse cervical a
what are the 2 major veins of the superficial neck?
anterior and external jugular vv
submandibular veins are branches of what vein?
anterior jugular v
anterior jugular vein drains into ____ or ____
external jugular v
subclavian v
