BIO 238 Instructor: Dr. Gourdine The Arm Muscles BIO 238 Instructor: Dr. Gourdine

LE 8-4 Greater tubercle Head Greater tubercle Lesser tubercle Intertubercular groove Anatomical neck Surgical neck Deltoid tuberosity Radial groove Shaft Lateral epicondyle Olecranon fossa Coronoid fossa Radial fossa Medial epicondyle Capitulum Trochlea Trochlea Condyle Anterior surface Posterior surface

LE 8-5 Coronoid process Olecranon Trochlear notch Radial head Proximal radioulnar joint Radial notch Neck of radius Ulnar tuberosity Radial tuberosity ULNA ULNA RADIUS Location of interosseous membrane Ulnar notch of radius Distal radioulnar joint Ulnar head Ulnar head Styloid process of ulna Styloid process of radius Posterior view Anterior view

LE 9-10 Tendon of biceps brachii muscle Annular ligament Humerus Articular capsule Humerus Radial collateral ligament Radial tuberosity Medial epicondyle Ulnar collateral ligament Radius Radius Antebrachial interosseous membrane Ulna Olecranon of ulna Ulna Capitulum Annular ligament (covering head and neck of radius) Medial view Lateral view

RADIUS Lunate Scaphoid Trapezium Trapezoid Capitate LE 8-6b RADIUS ULNA Lunate Scaphoid Triquetrum Trapezium Pisiform Trapezoid Hamate I Capitate V IV III II Metacarpal bones Proximal phalanx Middle phalanx Distal phalanx Posterior view

Right hand, anterior (palmar) view LE 11-18a Flexor retinaculum Right hand, anterior (palmar) view

Elbow Extension and Flexion

Wrist movements

Terminology Radial deviation= wrist abduction Ulnar Deviation= wrist adduction

Muscles of the Upper Extremities: Brachium Biceps brachii (pg 95) O- Short head-Coracoid process of scapula Long head-Supraglenoid tubercle of scapula I-Tuberosity of radius, bicipital aponeurosis A-Flexion of elbow, Supination of forearm, flexion of shoulder

Muscles of the Upper Extremities: Brachium Triceps brachii (pg 97) O- Long head- Infraglenoid tubercle of the scapula Lateral head- posterior surface of proximal half of the humerus Medial head-Posterior surface of distal half of the humerus I- Olecranon process of ulna A- All heads: Extension of elbow Long head: extension and adduction of shoulder

Muscles of the Upper Extremities: Brachium Brachialis (pg 132) O-Distal half of anterior surface of humerus I-Tuberosity and coronoid process of ulna A-Flexion of elbow

Muscles of the Upper Extremities: Antebrachium - Anterior Brachioradialis (pg 133) O- Proximal 2/3 of the lateral supracondylar ridge of humerus I-Styloid process of radius A-Flexion of elbow ; Assist to pronate and supinate the forearm when the movements are resisted

Muscles of the Upper Extremities: Antebrachium - Posterior Extensor carpi radialis brevis (pg 136) O-Lateral epicondyle of humerus (common extensor tendon) I-Base of 3rd metacarpal A-Extension and Abduction of wrist, assist with elbow flexion

Muscles of the Upper Extremities: Antebrachium - Posterior Extensor carpi radialis longus (pg 136) O- Distal 1/3 of the lateral supracondylar ridge of humerus I-Base of 2nd metacarpal A-Extension and abduction of wrist

Muscles of the Upper Extremities: Antebrachium - Posterior Extensor digitorum (pg 136) O-Lateral epicondyle of humerus (common extensor tendon) I-Bases of Middle and distal phalanges if 2nd -5th fingers A-Extension of 2nd - 5th fingers

Muscles of the Upper Extremities: Antebrachium - Posterior Extensor carpi ulnaris (pg 136) O-Lateral epicondyle of humerus (common extensor tendon) I-Base of 5th metacarpal A-Extension and adduction of wrist

Muscles of the Upper Extremities: Antebrachium - Posterior Anconeus (pg 139) O-Lateral epicondyle of humerus I- Olecranon process and posterior, proximal surface of ulna A- Extension of elbow

Muscles of the Upper Extremities: Antebrachium - Anterior Flexor carpi radialis (pg 141) O- Common flexor tendon from medial epicondyle of humerus I-Bases of 2nd and 3rd metacarpals A-Flexion and abduction of wrist, may assist with elbow flexion

Muscles of the Upper Extremities: Antebrachium - Anterior Palmaris longus (pg 141) O-Common flexor tendon from medial epicondyle of humerus I- Palmar aponeurosis, flexor retinaculum A- Tenses palmar fascia, Flexes wrist, may assist with elbow flexion

Muscles of the Upper Extremities: Antebrachium - Anterior Flexor carpi ulnaris (pg 142) O- Humeral head: common flexor tendon of medial epicondyle of humerus Ulnar head: posterior surface of proximal 2/3 of ulna I-Pisiform, hook of hamate, base of 5th metacarpal A-Flexion and adduction of wrist

Muscles of the Upper Extremities: Antebrachium - Anterior Pronator teres (pg 146) O- Common flexor tendon from medial epicondyle of humerus and coronoid process of ulna I-Middle of lateral surface of radius A-Pronation of forearm, assists in flexion of elbow

Muscles of the Upper Extremities: Antebrachium - Anterior Pronator Quadratus (pg 147) O-Medial, anterior surface of distal ulna I-Lateral, anterior surface of distal radius A-Pronates forearm

Muscles of the Upper Extremities: Antebrachium - Anterior Supinator (pg 147) O-Lateral epicondyle of humerus, annular and radial collateral ligaments, proximal ulna at supinator crest I- Anterior, lateral surface of proximal 1/3 of radial shaft A-Supination of forearm Figure 11–16b