20 terms

Ch 6 Head, Neck and Trunk

forehead muscle (Raises eyebrow andfacial expressions)
o: occiptal bone; i: scalp; pulls scalp posteriorly
orbicularis oculi
Closes eyelids; used in blinking, winking, and squinting
compresses cheeks
Elevates corners of mouth
a large muscle that raises the lower jaw and is used in chewing
Elevates and retracts mandible; assists in side to side movement of mandible
sheet-like muscle in neck that pulls mouth (jaw) downward
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
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.
a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm