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9 Cards in this Set

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Pectoralis major

ORIGIN: Clavicle (clavicular head), sternum, and costal cartilages of ribs 2–6 and sometimes ribs 1–7 (sternocostal head).


INSERTION: Greater tubercle and lateral lip of intertubercular sulcus of humerus


ACTION: As a whole, adducts and medially rotates arm at shoulder joint; clavicular head flexes arm, and sternocostal head extends flexed arm to side of trunk.


INNERVATION: Medial and lateral pectoral nerves.

AXIAL MUSCLE THAT MOVE THE HUMERUS

Latissimus dorsi

ORIGIN: Spines of T7–L5, lumbar vertebrae, crests of sacrum and ilium, ribs 9–12 via thoracolumbar fascia.


INSERTION: Intertubercular sulcus of humerus


ACTION: Extends, adducts, and medially rotates arm at shoulder joint; draws arm inferiorly and posteriorly. RMA: Elevates vertebral column and torso.


INNERVATION: Thoracodorsal nerve.

AXIAL MUSCLE THAT MOVE THE HUMERUS

Deltoid

ORIGIN: Acromial extremity of clavicle (anterior fibers), acromion of scapula (lateral fibers), and spine of scapula (posterior fibers).


INSERTION: Deltoid tuberosity of humerus.


ACTION: Lateral fi bers abduct arm at shoulder joint; anterior fi bers fl ex and medially rotate arm at shoulder joint; posterior fi bers extend and laterally rotate arm at shoulder joint.


INNERVATION: Axillary nerve

SCAPULAR MUSCLE THAT MOVE THE HUMERUS

Subscapularis

ORIGIN: Subscapular fossa of scapula.


INSERTION: Lesser tubercle of humerus


ACTION: Medially rotates arm at shoulder joint.


INNERVATION: Upper and lower subscapular nerve

SCAPULAR MUSCLE THAT MOVE THE HUMERUS

Supraspinatus

ORIGIN: Supraspinous fossa of scapula


INSERTION: Greater tubercle of humerus


ACTION: Assists deltoid muscle in abducting arm at shoulder joint.


INNERVATION: Suprascapular nerve

SCAPULAR MUSCLE THAT MOVE THE HUMERUS

Infraspinatus

ORIGIN: Infraspinous fossa of scapula


INSERTION: Greater tubercle of humerus


ACTION: Laterally rotates arm at shoulder joint


INNERVATION: Suprascapular nerve

SCAPULAR MUSCLE THAT MOVE THE HUMERUS

Teres major

ORIGIN: Inferior angle of scapula


INSERTION: Medial lip of intertubercular sulcus of humerus


ACTION: Extends arm at shoulder joint and assists in adduction and medial rotation of arm at shoulder joint


INNERVATION: Lower subscapular nerve

SCAPULAR MUSCLE THAT MOVE THE HUMERUS

Teres minor

ORIGIN: Inferior lateral border of scapula


INSERTION: Greater tubercle of humerus


ACTION: Laterally rotates and extends arm at shoulder joint


INNERVATION: Axillary nerve

SCAPULAR MUSCLE THAT MOVE THE HUMERUS

Coracobrachialis

ORIGIN: Coracoid process of scapula


INSERTION: Middle of medial surface of shaft of humerus


ACTION: Flexes and adducts arm at shoulder joint


INNERVATION: Musculocutaneous nerve

SCAPULAR MUSCLE THAT MOVE THE HUMERUS