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Reference Guide

Muscular System: Extremities - Reference Guides

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Department
ANAT - Anatomy
Course Code
ANAT 14
Professor
All

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p er m a ch ar tsMT Muscular System: EExtremities 2nd EDITION Figure 1: Anterior Muscles Figure 1: Anterior Muscles of the Arm, Forearm & Hand Figure 2: Posterior Muscles of the Arm, Forearm & Hand of the Arm, Forearm & Hand Superficial Layer Superficial Layer Superficial Layer 1 Deltoid 1 1 2 Biceps brachii Intermediate Layer (hort head) 3 Biceps brachii 2 (ong head) 4 Bicipital aponeurosis 5 Brachioradialis 3 6 Pronator teres 16 4 7 Extensor carpi radialis 2 17 lngus 8 Flexor carpi radialis 9 Palmaris longus 5 7 10 Flexor carpi ulnaris 3 6 11 Palmaris brevis 12 Abductor pollicis brevis 18 13 Flexor pollicis brevis • All of the muscles of (superficial head) the forearm and hand 14 Abductor digiti minimi 19 can be classified as either 15 Flexor digiti minimi brevis 4 intrinsic or extrinsic Intermediate Layer 5 • Though most of these 8 16 Subscapularis 6 muscles serve primarily 17 Coracobrachialis to move the hand, 18 Teres major intrinsic muscles have 19 Brachialis 8 20 both their origin and 20 Supinator 7 insertion within the hand9 21 Flexor digitorum superficialis 9 (e.g., flexor pollicis 10 22 Opponens pollicis brevis), while extrinsic 23 Opponens digiti minimi muscles insert in the 11 10 hand but originate from 12 Deep Layer 21 the arm or forearm (e.g., 24 Flexor digitorum profundus flexor pollicis longus) 25 Flexor pollicis longus 26 Lumbricals • Similar relationships Deep Layer of Palm 12 can be found in other 11 parts of the body 27 Pronator quadratus 13 14 • A muscle is classified as 28 Flexor pollicis brevis 22 a prime mover if it acts (deep head) 15 directly to produce a 29 Adductor pollicis 23 (oblique head) desired movement 30 Adductor pollicis • A synergist assists the (transverse head) prime mover in 31 Palmar interossei producing a movement, while an antagonist Figure 2: Posterior Muscles opposes the movement of the Arm, Forearm & Hand Superficial Layer Deep Layer Deep Layer of Palm 13 Deep Layer 1 Supraspinatus 2 Deltoid • For example, 3 Infraspinatus the biceps brachii 4 Teres minor 24 27 (prime mover) 14 5 Teres major 6 Triceps brachii flexes the (long head) forearm, the 16 15 7 Triceps brachii 25 brachialis (lateral head) (synergist) assists 8 Anconeus 28 in flexion, and the 9 Flexor carpi ulnaris triceps brachii 17 10 Extensor carpi ulnaris 11 Extensor digiti minimi 29 (antagonist) 18 19 12 Extensor digitorum opposes flexion • Muscles play 20 Deep Layer 30 different roles for 13 Triceps brachii
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