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origins and actions

Rhomboid Major

Action: adduct scapula (scapulothoracic Joint)
elevate the scapula (STJ)
Downwardly rotate scapula (STJ)


Elevates mandible
Assists in protracting the Mandible

Sternocleidomastiod (SCM)

Actions include neck flexion
Lateral Flexion s/s
rotate head o/s
assist in inhalation


elevate Mandible
retract Mandible

Occipitalis (occipitofrontalis)

anchor and retract galea aponeurotica

Frontalis (occipitofrontalis)

raise the eyebrows
wrinkle forehead


depress Mandible
tighten fascia of neck
draw down corner of mouth

Rhomboid Minor

adduct the scapula (STJ)
elevate scapula

Teres Minor

lateral rotate the shoulder (G/H )
adduct the shoulder
stabilize the Humerus in Glenoid cavity


abduct the shoulder (G/H)
stablize head of Humerus in Glenoid Cavity

Levator Scapula

Unilaterally: elevate scapula
downwardly rotate scapula
laterally flex head and neck
Bilaterally: extend head and neck
rotate head and neck s/s

Latissimus Dorsi

extend shoulder (G/H)
adduct G/H
medially rotate G/H

Serratus Anterior

abduct the scapula
upwardly rotate scapula
depress scapula
hold medial border of the scapula against rib cage

Pectoralis Major

ALL FIBERS: adduct shoulder
Medial rotation
assist elevation during inhalation
UPPER FIBERS: flex shoulder
horizon adduction
LOWER FIBERS: extend shoulders

Teres Major

adduct shoulder G/H
extend G/H
Medially rotate G/H


laterally rotate shoulder (G/H)
adduct G/H
stablize the head of Humerus in Glenoid Cavity


Unilaterally: extend head and neck
lateral flexion of head and neck s/s
rotate head and neck o/s
elevate scapula
upwardly rotate


medially rotate the shoulder (G/HJ)
stablize the head of Humerus in Glenoid cavity


ALL FIBERS: abduct shoulder (G/H)
medially rotate G/H
horizontally adduct G/H
laterally rotate G/H
horizontally abduct

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