muscles quiz material - muscles that act on the scapula

large muscle of the upper back

trapezius

trapezius origin

base of occipital bone (nuchal line) and all cervical and thoracic vertebrae

trapezius insertion

spine of scapula and acromion process, and clavicle

trapezius function

scapular elevation, adduction/retraction, upward rotation, depression, extends the neck

a skeletal muscle in the upper back that helps move and stabilize the shoulder blade

rhomboid major

a small, cylindrical upper-back muscle located deep to the trapezius and superior to the rhomboid major

rhomboid minor

rhomboid major origin

T2 - T5

rhomboid minor origin

C7 - T1

rhomboid major insertion

lower medial of scapula

rhomboid minor insertion

medial border of scapula at scapular spine

rhomboid major and minor function

assists the trapezius in downward rotation

along the back and side of the neck that raises the shoulder blade

levator scapulae

levator scapulae origin

first four cervical vertebrae (C1 to C4)

levator scapulae insertion

anterior surface of medial border of scapula

levator scapulae function

elevates scapula (with trapezius) and rotates scapula downwards

“boxer muscle” large muscle that runs along the rib cage

serratus anterior

serratus anterior origin

first eight to nine ribs (1 to 8 or 9)

serratus anterior insertion

anterior surface of medial border of scapula

serratus anterior function

upward rotation and abduction or protraction of scapula

a small, thin, triangular muscle located in the upper chest, directly underneath the larger pectoralis major muscle

pectoralis minor

pectoralis minor origin

3rd, 4th, and 5th ribs

pectoralis minor insertion

tip of coracoid process of scapula

pectoralis minor function

elevates and depress ribs and protracts scapula

a large, triangular skeletal muscle that covers the shoulder joint and gives the shoulder its rounded contour

deltoid

deltoid origin

clavicle, acromion, spine of scapula

deltoid insertion

deltoid tuberosity

deltoid function

flexes and medially rotates the shoulder joint

a small, elongated muscle located in the anterior compartment of the upper arm

coracobrachialis

coracobrachialis origin

coracoid process, runs medially to the short head of bicep branchii

coracobrachialis insertion

medial aspect of humerus

coracobrachialis function

flexor and adductor of the of the arm

a thick, flat muscle of the shoulder region that connects the scapula (shoulder blade) to the humerus (upper arm bone)

teres major

teres major origin

inferior lateral border of scapula

teres major insertion

intertubercular groove of a humerus

teres major function

medial rotator, adductor, extend humerus and shoulder