Muscles of Head and Neck Lab

Masseter Origin

Zygomatic Arch

Masseter Insertion

mandibular ramus

Masseter Action

Closes Jaw

Scalene Origin

cervical vertebrae

Scalene Insertion

Ribs 1 and 2

Scalene Action

flexes neck and elevates ribs 1 & 2

Temporalis Origin

temporal fossa

Temporalis Insertion

coronoid process of mandible

Temporalis Action

closes jaw

Sternocleidomastoid Origin

manubrium of the sternum

Sternocleidomastoid insertion

mastoid process of temporal bone

Sternocleidomastoid  action

flexes neck

Frontalis Epicranius Origin

epicranial aponeurosis

Frontalis epicranius insertion

skin around eyebrows

frontalis epicranius action

raises eyebrows, wrinkles forehead

occipitalis origin

occipital bone

occipitalis insertion

epicranial aponeurosis

occipitalis action

retracts the scalp

zygomaticus origin

zygomatic bone

zygomaticus insertion

skin and muscle of the corner of the mouth

zygomaticus action

speriorlaterally moves the mouth (smile)

trapezius origin

occipital bone

trapezius insertion

?

trapezius action

stabilizes, retracts, elevates scapula

rhomboid (major minor) origin

major: T2-T5

minor: C7-T1 (ON top)

rhomboid insertion

medial border of scapula

rhomboid action

retract/stabilize scapula

levator scapulae origin

transverse process C1-C4

levator scapulae insertion

superior to scapular spine

levator scapulae action

elevates/retracts scapula

Latissimus dorsi origin

lowest 3-4 ribs

Latissimus dorsi insertion

Intertubercular sulcus of the humerus

Latissimus dorsi action

extends and adducts humerus

Pectoralis Major origin

sternum

Pectoralis Major insertion

greater tubercle of humerus

Pectoralis Major action

flexes, adducts, and medially rotates humerus

Pectoralis Minor origin

ribs 3-5

Pectoralis Minor insertion

coracoid process of scapula

Pectoralis Minor action

draws the scapula forward and downward

Serratus anterior origin

ribs 1-8

Serratus anterior insertion

medial border of scapula

Serratus anterior action

protracts scapula

rectus abdominus origin

pubic symphysis

rectus abdominus insertion

xphoid process

rectus abdominus action

flexes lumbar region of vertebral column