Ch 6 Head, Neck and Trunk

20 terms by eagleswings59 Teacher

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marieb

frontalis

forehead muscle (Raises eyebrow andfacial expressions)

occipitalis

o: occiptal bone; i: scalp; pulls scalp posteriorly

orbicularis oculi

Closes eyelids; used in blinking, winking, and squinting

buccinator

compresses cheeks

zygomasticus

Elevates corners of mouth

masseter

a large muscle that raises the lower jaw and is used in chewing

temporalis

Elevates and retracts mandible; assists in side to side movement of mandible

platysma

sheet-like muscle in neck that pulls mouth (jaw) downward

sternocleidomastoid

one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone

pectoralis major

a skeletal muscle that adducts and rotates the arm

intercostal muscles

Muscles which move the rib cage during breathing

rectus abdominus

major spine flexor, forms 6 pack and translates to "straight muscle of abdomen"

external obliques

flexs vertebrae column; compresses abdomen ; rotates vertebrea column

internal obliques

Origin: Iliac Crest. Insertion: Linea Alba and Bottom of Costals. Action: Flexion and Rotation to Same Side.

transversus abdominis

a flat muscle with transverse fibers that forms the anterior and lateral walls of the abdominal cavity

rectus abdominis

straight (rectus) abdominal muscle

trapezius

either of two flat triangular muscles of the shoulder and upper back that are involved in moving the shoulders and arms

latissimus dorsi

Extends, adducts, and medially rotates the arm; draws the shoulder downward and backward

erector spinae

Major muscle group of the vertebral column. Consists of Iliocostalis, Longissimus, and Spinalis muscles. Laterally flex spine & extend vertebral column.

deltoid

a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm

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