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BIOB33H3 (116)
Lecture 7

Lecture 7 notes.doc

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Department
Biological Sciences
Course Code
BIOB33H3
Professor
Connie Potroff

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1 Lecture 7 The Muscular System: Appendicular Musculature (based on Chapter 11) Appendicular Musculature Muscles of the Pectoral Girdle and Upper Limbs Muscles That Move the Forearm and Hand • The elbow joint is the articulation of the distal surface of the humerus with radius and ulna • hinge joint composed of two articulations enclosed in a single joint capsule and another separate joint not part of the hinge • muscles that move the elbow, flexion (biceps brachii, brachioradialis and brachialis), extension (*anconeus, triceps brachii), pronation (pronator teres, pronator quadratus), supination (supinator) • **Most of these muscles originate on the humerus and insert upon the forearm and wrist Exceptions include: Long head of triceps brachii: originates on the scapula and inserts on the olecranon of ulna (lateral and medial heads originate on humerus and insert on olacranon) Short and Long head of biceps brachii: originate on the scapula and insert of the radial tuberosity of the radius Biceps brachii: flexes at the elbow and shoulder (see above) Brachialis: flexes at the elbow (origin: humerus, insertion: forearm and wrist) Brachioradialis: flexes at the elbow (origin: humerus, insertion: forearm and wrist) Anconeus: extension at the elbow (origin: humerus, insertion: forearm and wrist) Triceps brachii: extension at elbow, extension and adduction at elbow (long head) (origin: scapula, insertion: ulna) Lateral head: extension at the elbow (origin: scapula, insertion: ulna) Long head: extension at the elbow and adduction at the shoulder (origin: scapula, insertion: ulna) Medial head: extension at the elbow (origin: scapula, insertion: ulna) Pronator quadratus: pronates the forearm (origin: humerus, insertion: forearm and wrist) Pronator teres: pronates the forearm (origin: humerus, insertion: forearm and wrist) Supinator: supinates the forearm (origin: humerus, insertion: forearm and wrist) - muscles of the forearm move the joints of the wrist, hand and fingers • lots of muscles front and back , 2 classes: • muscles that flex the wrist, superficial closer to skin surface • muscles that flex the fingers, deeper • **muscles of wrist that produce flexion come from medial epicondyle (aka common flexor origin) • on radial side - Flexor carpi radialis: flex and abduct the wrist (landmark for locating the radial artery, where the pulse is usually taken) On ulnar (medial) side - Flexor carpi ulnaris: flex and adduct the wrist **Palmaris longus: flexion at the wrist • **wrist and finger (deeper) muscles that produce extension – extensors from lateral epicondyle (on lateral side) of humerus Extensor carpi radialis longus: extend and abduct at the wrist Extensor carpi radialis brevis: extend and abduct at the wrist Extensor carpi ulnaris: extension and adduction at the wrist Muscles That Move the Hand and Fingers © 2012 Pearson Education, Inc. 2 **Extrinsic Muscles of the Hand Relatively large muscles that perform **flexion and extension** at the joints of the fingers Provide strength and crude control of the hand and fingers These muscles are found mostly in the lower arm Flexor digitorum superficialis: flexion at the wrist and some digits Flexor digitorum profundus: flexion at the wrist and some digits Flexor pollicis longus: flexion of the thumb Abductor pollicis longus: abduction of thumb Extensor digitorum: extension of fingers and wrist Extensor pollicis brevis: extension of thumb, abducts the wrist Extensor indicis: extension and adduction of index finger Extensor digiti minimi: extension of little finger, extension of wrist **Intrinsic Muscles of the
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