term1 Definition1term2 Definition2term3 Definition3
Please sign in to your Google account to access your documents:
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.
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
Supraspinatus
ORIGIN: Supraspinous fossa of scapula
INSERTION: Greater tubercle of humerus
ACTION: Assists deltoid muscle in abducting arm at shoulder joint.
INNERVATION: Suprascapular nerve
Infraspinatus
ORIGIN: Infraspinous fossa of scapula
ACTION: Laterally rotates arm at shoulder joint
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
Teres minor
ORIGIN: Inferior lateral border of scapula
ACTION: Laterally rotates and extends arm at shoulder joint
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
Need help typing ? See our FAQ (opens in new window)
Please sign in to create this set. We'll bring you back here when you are done.
Discard Changes Sign in
Please sign in to add to folders.
Sign in
Don't have an account? Sign Up »
You have created 2 folders. Please upgrade to Cram Premium to create hundreds of folders!