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Upper Limb Flashcards

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Abductor pollicis longus

Posterior (extensor) deep forearm

Posterior interosseous nerve (continuation of deep branch of radial nerve)

  1. Abducts thumb and extends it at carpometacarpal joint
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2
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Adductor pollicis

Adductor-Interosseous compartment

Deep branch of ulnar nerve

  1. Adducts thumb toward lateral border of palm
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3
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Adductor-Interosseus

Ulnar nerve

  1. Adductor pollicis
  2. Palmar interossei
  3. Dorsal interossei
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4
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Biceps brachii

Anterior (flexor) arm

Musculocutaneous nerve

  1. Supinates forearm
  2. Flexes forearm (when supine)
  3. Short head resists dislocation of shoulder
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5
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Brachialis

Anterior (flexor) arm

Musculocutaneous nerve

  1. Flexes forearm in all positions
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6
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Brachioradialis

Posterior (extensor) superficial forearm

Radial nerve

  1. Relatively weak flexion of forearm; maximal when forearm is in mid-pronated position
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7
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Central

  1. Lumbricals
  2. Tendons of flexor digitorum superficialis
  3. Tendons of flexor digitorum profundus
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8
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Coracobrachialis

Anterior (flexor) arm

Musculocutaneous nerve

  1. Flexes arm
  2. Adducts arm
  3. Resists dislocation of shoulder
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9
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Deltoid

Axillary nerve

  1. Flexes, abducts, extends, medially and laterally rotates arm
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10
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Dorsal interossei

Adductor-Interosseous compartment

Deep branch of ulnar nerve

  1. Abducts digits 2-4 from axial line
  2. Act with lumbricals in flexing MCP joints and extending IP joints
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11
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Extensor carpi radialis brevis

Posterior (extensor) superficial forearm

Deep branch of radial nerve

  1. Extends and abducts hand (at wrist)
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12
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Extensor carpi radialis longus

Posterior (extensor) superficial forearm

Radial nerve

  1. Extend and abducts hand (at wrist)
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13
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Extensor carpi ulnaris

Posterior (extensor) superficial forearm

Deep branch of radial nerve

  1. Extends and adducts hand (at wrist)
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14
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Extensor digiti minimi

Posterior (extensor) superficial forearm

Deep branch of radial nerve

  1. Extends 5th digit primarily at MCP joint, secondarily at IP joint
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15
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Extensor digitorum

Posterior (extensor) superficial forearm

Deep branch of radial nerve

  1. Extends medial 4 digits primarily at MCP joints, secondarily at IP joints
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16
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Extensor indicis

Posterior (extensor) deep forearm

Posterior interosseous nerve (continuation of deep branch of radial nerve)

  1. Extends 2nd digit (enabling its independent extension)
  2. Helps extend hand (at wrist)
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17
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Extensor pollicis brevis

Posterior (extensor) deep forearm

Posterior interosseous nerve (continuation of deep branch of radial nerve)

  1. Extends proximal phalanx of thumb at MCP joint
  2. Extends carpometacarpal joints
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18
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Extensor pollicis longus

Posterior (extensor) deep forearm

Posterior interosseous nerve (continuation of deep branch of radial nerve)

  1. Extends distal phalanx of thumb at IP joint
  2. Extends MCP and carpometacarpal joints
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19
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Flexor carpi radialis

Anterior (flexor) superficial forearm

Median nerve

  1. Flexes and abducts hand (at wrist)
20
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Flexor carpi ulnaris

Anterior (flexor) superficial forearm

Ulnar nerve

  1. Flexes and adducts hand (at wrist)
21
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Flexor digitorum profundus

Anterior (flexor) deep forearm

Anterior interosseous nerve (from median nerve)= digits 1, 2, 3

Ulnar nerve= digits 4, 5

  1. Flexes distal phalanges at distal IP joints
22
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Flexor digitorum superficialis

Anterior (flexor) superficial forearm

Median nerve

  1. Flexes middle phalanges at proximal IP joints of middle 4 digits
  2. Flexes proximal phalanges at MCP joints
23
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Flexor pollicis longus

Anterior (flexor) deep forearm

Anterior interosseous nerve (from median nerve)

  1. Flexes phalanges of 1st digit (thumb)
24
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Hypothenar

Deep branch of ulnar nerve

  1. Abductor digiti minimi
  2. Flexor digiti minimi
  3. Opponens digiti minimi
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Infraspinatus Suprascapular nerve 1. Laterally rotates arm
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Latissimus dorsi Thoracodorsal nerve 1. Extends, adducts, and medially rotates humerus
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Levator scapulae Dorsal scapular nerve 1. Elevates and retracts scapula
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Lumbricals Median nerve (1st and 2nd) Deep branch of ulnar nerve (3rd and 4th) 1. Flex MCP joints 2. Extend IP joints of 2nd-5th digits
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Palmar interossei Adductor-Interosseous compartment Deep branch of ulnar nerve 1. Adducts 2nd, 4th, and 5th digits toward axial line 2. Assists lumbricals in flexing MCP joints and extending IP joints
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Palmaris longus Anterior (flexor) superficial forearm Median nerve 1. Flexes hand (at wrist) 2. Tenses palmar aponeurosis
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Pectoralis major Lateral pectoral nerve & medial pectoral nerve 1. Adducts, flexes and medially rotates humerus 2. Protracts, depresses, and downwardly rotates scapula
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Pectoralis minor Medial pectoral nerve 1. Depresses and inferiorly rotates scapula
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Pronator quadratus Anterior (flexor) deep forearm Anterior interosseous nerve (from median nerve) 1. Pronates forearm
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Pronator teres Anterior (flexor) forearm Median nerve 1. Pronates and flexes forearm
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Rhomboid major Dorsal scapular nerve 1. Retracts and elevates scapula
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Rhomboid minor Dorsal scapular nerve 1. Retracts and elevates scapula
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Serratus anterior Long thoracic nerve 1. Protracts and rotates scapula
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Subscapularis Upper subscapular nerve & lower subscapular nerve 1. Medially rotates arm
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Supinator Posterior (extensor) deep forearm Deep branch of radial nerve 1. Supinates forearm
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Supraspinatus Suprascapular nerve 1. Initiates abduction of arm
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Teres major Lower subscapular nerve 1. Adducts, extends, and medially rotates arm
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Teres minor Axillary nerve 1. Laterally rotates arm
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Thenar Recurrent branch of median nerve 1. Opponens pollicis 2. Abductor pollicis 3. Flexor pollicis brevis
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Trapezius ## Footnote Accessory nerve (CN XI) 1. Elevates, depresses, retracts (adducts), and rotates and scapula upward
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Triceps brachii Posterior (extensor) arm Radial nerve 1. Chief extensor of forearm 2. Long head resists dislocation of humerus

Upper Limb Muscles (2 decks)

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