anatomy lecture exam 2

sternocleidomastoid origin

manubriam and medial 1/3 of clavicle

sternocleidomastoid insertion

mastoid process

sternocleidomastoid nerve

spinal accessory nerve

sternocleidomastoid action

flexes neck, draws head to shoulder, turns face to other side, accessory muscle of respiration

anterior scalene origin

transverse processes of c3-c6

anterior scalene insertion

first rib

anterior scalene innervatoin

VPR c4-c6

middle scalene origin

transverse processes of c2-c7

middle scalene insertion

first rib

middle scalene innervation

VPR c3-c8

posterior scalene origin

transverse processes of c5-c6

posterior scalene insertion

second rib

posterior scalene innervation

VPR c6-c8

scalenes action

bilaterally flees head/neck, elevates first rib during forced inspiration, accessory muscle of respiration

sternohyoid innervation

c1-c3 ansa vervicalis

sternohyoid action

depresses hyoid bone after swallowing

sternothyroid innervation

c2 and c3 ansa cervicalis

sternothyroid action

depresses larynx after swallowing

thyrohyoid innervation

c1 via hypoglossal nerve

thyrohyoid action

depresses hyoid bones, elevates larynx when hyoid is fixed

omohyoid innervation

c1-c3 ansa cervicalis

omohyoid action

depresses, retracts, and fixes hyoid bone

infrahyoids

sternohyoid, sternothyroid, thyrohyoid, omohyoid (inferior and superior belly)

suprahyoids

mylohyoid, geniohyoid, stylohyoid, digastric (anterior belly), digastric (posterior belly)

mylohyoid innervation

mylohyoid nerve

mylohyoid action

elevates hyoid bone, floos or mouth and tongue when swallowing and speaking

geniohyoid innervation

c1 and c2

genohyoid action

elevates and draws hyoid bone anterior, shortens floor of mouth, widens pharynx

stylohyoid innervation

facial nerve

stylohyoid action

elevates and retracts hyoid bone

digastric anterior belly innervation

mylohyoid nerve of inferior alveolar nerve

digastric anterior belly action

represses mandible, raises and steadies hyoid bone during swallowing and speaking

digastric posterior belly innervation

facial nerve

digastric posterior belly action

depresses mandible, raises and steadies hyoid bone during swallowing and speaking