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Lecture 7

Lecture 7.pdf

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Department
Biological Sciences
Course
BIOC33H3
Professor
Connie Soros
Semester
Fall

Description
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 • Brachioradialis: flexes at the elbow • Anconeus: extension at the elbow • Triceps brachii: extension at elbow, extension and adduction at elbow (long head) • Lateral head: extension at the elbow • Long head: extension at the elbow and adduction at the shoulder • Medial head: extension at the elbow • Pronator quadratus: pronates the forearm • Pronator teres: pronates the forearm • Supinator: supinates the forearm - 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 Hand • Smalle
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