SCM, scalene, omohyoid Flashcards
Insertion of entire sternocleidomastoid?
Mastoid process of temporal bone
Superior nuchal line of occipital bone
Innervation of Sternocleidomastoid?
Motor: accessory nerve (CN XI)
Pain and proprioception: Cervical plexus (C2, C3)
Action of sternocleidomastoid?
Unilateral: ipsilateral flexion, contralateral rotation
Bilaterally: Extends head, aids in respiration
Origin of clavicular head of sternocleidomastoid?
Medial one-third of clavicle
3 parts of scalene muscle?
Anterior, middle, posterior
Origin of anterior scalene?
C3-C6
Anterior tubercles of transverse processes
Insertion of anterior scalene?
Scalene tubercle of 1st rib
Origin of middle scalene?
C1-C2
(transverse processes)
C3-C7
(Posterior tubercles of transverse processes)
Insertion of middle scalene?
1st rib
posterior to groove for subclavian artery
Origin of posterior scalene?
C5-C7
posterior tubercles of transverse processes
Insertion of posterior scalene?
Outer surface of 2nd rib
Innervation of all parts of scalene muscle?
Direct branches from cervical and brachial plexus
C3-C8
Action of all parts of scalene muscle?
With ribs mobile:
Elevates upper ribs during forced inspiration
With ribs fixed:
Bends cervical spine ipsilateral (unilateral)
Flexes neck (bilateral)
Origin of omohyoid?
Superior border of scapula
Insertion of omohyoid?
Hyoid bone
body
