A+P LAB OIAs

Levator scapulae — Origin?

Vertebrae C1–C4

Levator scapulae — Insertion?

Medial (vertebral) border of scapula

Levator scapulae — Action?

Elevates scapula

Pectoralis minor — Origin?

Ribs 3–5

Pectoralis minor — Insertion?

Coracoid process of scapula

Pectoralis minor — Action?

Pulls scapula downward and forward when ribs are fixed; assists inspiration when scapula is fixed

Rhomboid minor — Origin?

Vertebrae C7–T1

Rhomboid minor — Insertion?

Medial border of scapula

Rhomboid minor — Action?

Adducts scapula

Rhomboid major — Origin?

Vertebrae T1–T5

Rhomboid major — Insertion?

Medial border of scapula

Rhomboid major — Action?

Adducts scapula

Subclavius — Origin?

Superior border of rib 1

Subclavius — Insertion?

Inferior border of clavicle

Subclavius — Action?

Depresses clavicle

Serratus anterior — Origin?

Ribs 1–9

Serratus anterior — Insertion?

Medial border of scapula

Serratus anterior — Action?

Fixes/stabilizes scapula

Trapezius — Origin?

Occipital region and nuchal ligament

Trapezius — Insertion?

Clavicle, acromion, and spine of scapula

Trapezius — Action?

All fibers adduct scapula; upper fibers elevate scapula; lower fibers depress scapula

Deltoid — Origin?

Clavicle and spine of scapula

Deltoid — Insertion?

Deltoid tuberosity of humerus

Deltoid — Action?

Abducts arm at shoulder

Supraspinatus — Origin?

Supraspinous fossa of scapula

Supraspinatus — Insertion?

Greater tubercle of humerus

Supraspinatus — Action?

Abducts arm at shoulder

Subscapularis — Origin?

Subscapular fossa of scapula

Subscapularis — Insertion?

Lesser tubercle of humerus

Subscapularis — Action?

Medially rotates arm at shoulder

Teres major — Origin?

Inferior angle of scapula

Teres major — Insertion?

Intertubercular sulcus of humerus

Teres major — Action?

Adducts and medially rotates arm at shoulder

Infraspinatus — Origin?

Infraspinous fossa of scapula

Infraspinatus — Insertion?

Greater tubercle of humerus

Infraspinatus — Action?

Laterally rotates arm at shoulder

Teres minor — Origin?

Lateral border of scapula

Teres minor — Insertion?

Greater tubercle of humerus, inferior to insertion of infraspinatus

Teres minor — Action?

Laterally rotates arm at shoulder

Pectoralis major — Origin?

Clavicle, sternum, and ribs 1–6

Pectoralis major — Insertion?

Intertubercular sulcus of humerus

Pectoralis major — Action?

Adducts, medially rotates, and flexes arm at shoulder

Triceps brachii — Long head origin?

Infraglenoid tubercle of scapula

Triceps brachii — Lateral head origin?

Posterior/superior humerus

Triceps brachii — Medial head origin?

Posterior humerus

Triceps brachii — Insertion?

Olecranon process of ulna

Triceps brachii — Action?

Extends forearm at elbow

Latissimus dorsi — Origin?

Vertebrae T7–L5 and ribs 8–12

Latissimus dorsi — Insertion?

Intertubercular groove of humerus

Latissimus dorsi — Action?

Extends, adducts, and medially rotates arm

Biceps brachii — Long head origin?

Supraglenoid tubercle of scapula

Biceps brachii — Short head origin?

Coracoid process of scapula

Biceps brachii — Insertion?

Radial tuberosity

Biceps brachii — Action?

Flexes forearm at elbow and supinates forearm

Brachialis — Origin?

Anterior distal surface of humerus

Brachialis — Insertion?

Coronoid process of ulna

Brachialis — Action?

Major flexor of forearm at elbow

Brachioradialis — Origin?

Lateral distal humerus near lateral epicondyle

Brachioradialis — Insertion?

Styloid process of radius

Brachioradialis — Action?

Flexes forearm at elbow

Pronator teres — Origin?

Medial epicondyle of humerus and coronoid process of ulna

Pronator teres — Insertion?

Middle lateral surface of radius

Pronator teres — Action?

Pronates forearm

Pronator quadratus — Origin?

Distal anterior/medial ulna

Pronator quadratus — Insertion?

Distal anterior/lateral radius

Pronator quadratus — Action?

Pronates forearm