anatomy exam 3

origin of sternocleidomastoid

sternal head: sternum

clavicular head: medial 1/3 of clavicle

insertion of sternocleidomastoid

mastoid process of temporal bone & superior nuchal line of occipital bone

function of sternocleidomastoid

unilateral: tilt head to same side
bilateral: extend head

innervation of sternocleidomastoid

accessory nerve

blood supply of sternocleidomastoid

superior thyroid artery

origin of trapezius

descending: occipital bone & spinous process of C1-C7

transverse: aponeurosis at spinous process of T1-T4

ascending: spinous process of T5-T12

insertion of trapezius

descending: lateral 1/3 of clavicle

transverse: acromion

ascending: scapular spine

function of trapezius

descending: draw scapula obliquely up

transverse: adduct scapula

ascending: draw scapula medially down

innervation of trapezius

accessory nerve & cervical plexus

blood supply of trapezius

transverse cervical artery

origin of platysma

skin over lower neck and upper lateral thorax

insertion of platysma

inferior border of mandible & skin over lower face and angle of mouth

function of platysma

depress skin of face and mouth

innervation of platysma

cervical branch of facial nerve

blood supply of platysma

submental branch of facial artery

origin of anterior scalene

anterior tubercles of transverse processes of C3-C6

insertion of anterior scalene

scalene tubercle of 1st rib

function of anterior, medial, and posterior scalenes

mobile ribs: elevate upper ribs

fixed ribs: flex neck

innervation of anterior scalene

cervical and brachial plexuses

blood supply of anterior, middle, and posterior scalene

ascending cervical artery

origin of middle scalene

transverse processes of C1-C2 + posterior tubercle of transverse processes of C3-C7

insertion of middle scalene

1st rib, posterior to subclavian artery groove

innervation of middle and posterior scalenes

direct branches of cervical and brachial plexuses

origin of posterior scalene

posterior tubercles of transverse processes of C5-C7

insertion of posterior scalene

outer surface of 2nd rib

origin of levator scapulae

transverse process of C1-C4

insertion of levator scapulae

superior angle of scapula

action of levator scapulae

draw scapula upward

innervation of levator scapulae

dorsal scapular nerve

blood supply of levator scapula

transverse and ascending cervical arteries

origin of splenius capitis

ligamentum nuchae & spinous process of C7-T3

insertion of splenius capitis

lateral superior nuchal line of occipital bone & mastoid process of temporal bone

action of splenius capitis and splenius cervicis

unilateral: rotate head to same side
bilateral: extend head

innervation of splenius capitis and splenius cervicis

spinal nerves C1-C6

blood supply of splenius capitis and splenius cervicis

descending branch of occipital artery & deep cervical artery

origin of splenius cervicis

spinous process of T3-T6

insertion of splenius cervicis

transverse process of C1-C2

origin of frontalis

frontal belly: skin of eyebrow and forehead
occipital belly: superior nuchal line

insertion of frontalis

galea aponeurosis

action of frontalis

frontal belly: raise eyebrow
occipital belly: retract scalp

innervation of frontalis

temporal branch of facial nerve

blood supply of frontalis

supratrochlear and supraorbital arteries

origin of orbicularis oculi

medial orbital margin & palpebral ligament & lacrimal bone

insertion of orbicularis oculi

skin around orbit & palpebral ligament & upper and lower eyelids

action of orbicularis oculi

close eyelids

innervation of orbicular oculi

temporal and zygomatic branches of facial nerve

blood supply of orbicular oculi

facial and superficial temporal arteries

origin of nasalis

canine eminence of maxillary bone

insertion of nasalis

aponeurosis on nasal cartilages

function of nasalis

compresses nostrils

innervation of nasalis

zygomatic and temporal branches of facial nerve

blood supply of nasalis

superior labial artery

origin of levator labii superioris alaeque nasi

upper frontal process of maxillary bone

insertion of levator labii superioris alaeque nasi

major alar cartilage & skin of nose & lateral upper lip

function of levator labii superioris alaeque nasi

elevate upper lip

innervation of levator labii superioris alaeque nasi

zygomatic and buccal branches of facial nerve

blood supply of levator labii superioris alaeque nasi

superior labial artery and angular branches of facial artery

origin of levator labii superioris

maxillary bone above infraorbital foramen

insertion of levator labii superioris

skin of upper lip

function of levator labii superioris

elevate upper lip

innervation of levator labii superioris

zygomatic and buccal branches of facial nerve

blood supply of levator labii superioris

superior labial artery & angular branches of facial artery

origin of zygomatic major

zygomatic arch

insertion of zygomatic major

angle of mouth

action of zygomatic major

draws angle of mouth up and back

innervation of zygomatic major and minor

zygomatic and buccal branches of facial nerve

blood supply of zygomatic major and minor

superior labial artery

origin of zygomatic minor

zygomatic arch

insertion of zygomatic minor

angle of mouth and upper lip

action of zygomatic minor

elevate upper lip

origin of depressor labii inferioris

lateral surface of mandible between symphysis and mental foramen

insertion of depressor labii inferioris

skin of lower lip

function of depressor labii inferior

depresses lower lip

innervation of depressor labii inferior

mandibular and buccal branches of facial nerve

blood supply of depressor labii inferior

inferior labial artery

origin of orbicularis oris

maxillary bone above incisors

insertion of orbicular oris

skin around lips

function of orbicularis oris

compresses the lips

innervation of orbicularis oris

zygomatic, buccal, and mandibular branches of facial nerve

blood supply of orbicularis oris

inferior and superior labial branches of facial artery

origin of levator anguli oris

canine fossa of maxillary bone

insertion of levator anguli oris

angle of mouth

function of levator anguli oris

elevates angle of mouth

innervation of levator anguli oris

zygomatic and buccal branches of facial nerve

blood supply of levator anguli oris

superior labial artery of facial artery

origin of depressor anguli oris

continues with platysma muscle on oblique line of mandible

insertion of depressor anguli oris

angle of mouth

function of depressor anguli oris

depresses angle of mouth

innervation of depressor anguli oris

mandibular and buccal branches of facial nerve

blood supply of depressor anguli oris

inferior labial artery

origin of mentalis

incisive fossa of mandible

insertion of mentalis

skin of chin

function of mentalis

raises and protrudes lower lip

innervation of mentalis

marginal mandibular branch of facial nerve

blood supply of mentalis

inferior labial artery

origin of buccinator

alveolar processes of molar region of maxilla and mandible

insertion of buccinator

angle of mouth

function of buccinator

compress cheeks

innervation of buccinator

buccal branches of facial nerve

blood supply of buccinator

muscular branches of facial artery & buccal branch of maxillary artery