314
UNIT TWO
Biceps brachii
Coracobrachialis
Triceps brachii
Humerus
Deltoid
Long head of biceps brachii
Short head of biceps brachii
Coracobrachialis
Teres major
Latissimus dorsi
Serratus anterior
Pectoralis major
FIGURE 9.30
Cross section of the arm.
TABLE
9.7
|
Muscles That Move the Arm
Muscle
Origin
Insertion
Action
Nerve Supply
Coracobrachialis
Coracoid process of scapula
Shaft of humerus
Flexes and adducts the arm
Musculocutaneus n.
Pectoralis major
Clavicle, sternum, and costal
cartilages of upper ribs
Intertubercular groove of humerus
Flexes, adducts, and rotates arm medially
Pectoral n.
Teres major
Lateral border of scapula
Intertubercular groove of humerus
Extends, adducts, and rotates arm medially
Lower subscapular n.
Latissimus dorsi
Spines of sacral, lumbar, and
lower thoracic vertebrae, iliac
crest, and lower ribs
Intertubercular groove of humerus
Extends, adducts, and rotates the arm
medially, or pulls the shoulder downward
and back
Thoracodorsal n.
Supraspinatus
Posterior surface of scapula
above spine
Greater tubercle of humerus
Abducts the arm
Suprascapular n.
Deltoid
Acromion process, spine of
the scapula, and the clavicle
Deltoid tuberosity of humerus
Abducts, extends, and ±
exes arm
Axillary n.
Subscapularis
Anterior surface of scapula
Lesser tubercle of humerus
Rotates arm medially
Subscapular n.
Infraspinatus
Posterior surface of scapula
below spine
Greater tubercle of humerus
Rotates arm laterally
Suprascapular n.
Teres minor
Lateral border of scapula
Greater tubercle of humerus
Rotates arm laterally
Axillary n.
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