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54 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Coracobrachialis
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Innervation: musculocutaneous n.
Actions: flexes and adducts arm |
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Biceps brachii
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Innervation: musculocutaneous n.
Actions (primary->tertiary): flexes elbow joint, supinates radius (forearm), weak shoulder joint flexor |
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Brachialis
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Innervation: musculocutaneous n.
Action: flexes elbow |
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Triceps brachii
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Innervation: radial n.
Action: extends elbow (esp. when pushing object) |
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Trapezius
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Innervation: CN XI (spinal accessory) joined by motor branches of C3 and C4
Action: retracts the scapula |
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superior and inferior fibers of the trapezius
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Action: superior pulls upward on lateral angle and inferior fibers pull downward on base of spine, ROTATING GLENOID CAVITY UPWARD
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middle fibers of the trapezius
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Action: upward rotation and preventing the sagging of the lateral angle (glenoid cavity) of the scapula
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Latissimus dorsi
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Innervation: thoracodorsal n (C6-C8) motor branch of brachial plexus
Action: adduction, medial rotation, and extension of arm (swimming stroke) |
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Levator scapulae
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Innervation: dorsal scapular n. (C3)
Action: elevates medail angle of scapula |
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Rhomboideus minor
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Innervation: dorsal scapular n. (C5)
Action: elevates medial border and retracts scapula |
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Rhomboideus major
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Innervation: dorsal scapular n.
Action: elevates medial border and retracts scapula |
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Serratus anterior
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Innervation: long thoracic nerve
Action: protracts scapula secondarily rotates scapula upward assisting in arm abduction |
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Pronator teres (has two heads)
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Innervation: median n. (C6-C7) passes between two heads
Action: pronates hand |
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Flexor carpi radialis
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Innervation: median nerve (C6-C7)
Action: flexor and radial abductor of the wrist |
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Palmaris longus (absent in 7% of population)
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Innervation: median n. (C6-C7)
Action: flexes wrist |
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Flexor carpi ulnaris (has two heads)
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Innervation: ulnar n. (C8 and T1)
Action: flexor and ulnar abductor of wrist |
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Flexor digitorum superficialis
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Innervation: median nerve (C7-T1)
Action: flexes middle phalanges (virtue of fact that tendon crosses proximal interphalangeal (PIP) joint |
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Flexor policis longus
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Innervation: anterior interosseous branch of the median n. (C7-T1)
Action: flexes proximal and distal phalanges of thumb |
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Flexor digitorum profundus
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Innervation: median n. supplies lateral 1/2, ulnar n. supplies medial 1/2 (C8-T1)
Action: flexes middle and distal phalanges (crosses PIP and DIP joints) |
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Pronator quadratus
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Innervation: anterior interosseous branch of the of the median n. (C7-T1)
Action: pronates hand |
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Brachioradialis
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Innervation: radial n.
Action: flexor of elbow |
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Extensor carpi radialis longus
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Innervation: radial n. (C6-C7)
Action: extensor and radial abductor of wrist |
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Extensor carpi radialis brevis
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Innervation: posterior interosseous n., a branch of the radial n. (C6-C7)
Action: extensor and radial abductor of wrist |
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Extensor digitorum and Extensor digiti minimi
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Innervation: posterior interosseous n.
Action: extensor of all phalanges of digits 2-5 and abducts fingers upon extension. Ext. digiti minimi only acts on 5th digit |
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Extensor carpi ulnaris
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Innervation: posterior interosseous n.
Action: extensor and ulnar abductor of wrist |
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Supinator
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Innervation: posterior interosseous n.
Action: supination of the hand |
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Abductor pollicis longus
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Innervation: posterior interosseous n.
Action: abducts, extends, and laterally rotates first metacarpal to draw thumb away from position of opposition acts in radial abduction of the wrist |
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Extensor pollicis brevis
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Innervation: posterior interosseous n.
Action: radial abductor of wrist, extensor of proximal phalanx of thumb extensor of first metacarpal |
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Extensor pollicis longus
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Innervation: posterior interosseous n.
Action: extends distal and proximal phalanges of thumb extends and abducts first metacarpal |
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Extensor indicis
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Innervation: posterior interosseous n.
Action: extends all joints of index finger independently abducts index finger |
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Infraspinatus
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Innervation: suprascapular n.
Action: lateral rotation of arm |
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Teres Minor Muscle
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Innervation: axillary n.
Action: lateral rotation of arm weak adductor of arm |
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Deltoid muscle
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Innervation: axillary n.
Actions: anterior flexes/medially rotates arm middle abducts arm posterior extend/laterally rotates arm |
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Supraspinatus
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Innervation: suprascapular n.
Action: abducts arm supports arm against downward pull when arm at side |
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Teres Major
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Innervation: lower subscapular n.
Action: adduction medial rotation extension of arm when these actions opposed |
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Subscapularis
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Innervation: upper and lower subscapular nn.
Action: medial rotation of arm |
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Opponens Pollicis
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Innervation: recurrent branch of median n.
Action: opposes thumb (draws it medially to palm and rotates it medially) |
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Abductor Pollicis Brevis
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Innervation: recurrent branch of the median n.
Action: abducts thumb helps oppose thumb |
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Flexor Pollicis Brevis
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Innervation: recurrent branch of median n. in superficial head, deep branch of ulnar nerve in deep branch
Action: flexes thumb |
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Adductor Pollicis
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Innervation: deep branch of ulnar nerve
Action: adducts thumb |
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Abductor Digiti Minimi
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Innervation: deep branch of ulnar nerve
Action: abducts 5th digit helps flex 5th proximal phalanx |
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Flexor Digiti Minimi Brevis
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Innervation: deep branch of the ulnar nerve
Action: flexes 5th proximal phalanx |
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Opponens Digiti
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Innervation: deep branch of the ulnar nerve
Action: opposes 5th digit to thumb (draws anterior and rotates it) |
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1st and 2nd Lumbricales
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Innervation: median nerve
Action: flex MP joints while extending IP joints of 2nd-5th digits |
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3rd and 4th Lumbricales
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Innervation: deep branch of ulnar nerve
Action: flex MP joints while extending IP joints of 2nd-5th digits |
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Dorsal Interossei (1st, 3rd, 4th)
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Innervation: deep branch of ulnar nerve
Action: abduct 2nd-4th digit from axial line help lumbricales flex MP while extending IP |
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Palmar Interossei
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Innervation: deep branch of the ulnar nerve
Action: adduct 2nd, 4th, and 5th digits toward axial line help lumbricales flex MP and extend IP |
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Splenius Capitis and Splenius Cervicis
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Innervation: posterior rami of spinal nerves
Action: alone laterally rotate head and flex neck together extend head and neck |
splenius capitis attaches to mastoid processes and splenius cervicis attaches to cervical transverse processes
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Erector Spinae muscles (from lateral to medial: iliocostalis, longissimus, spinalis)
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Innervation: posterior rami of spinal nerves
Action: acting bilaterally; extend vertebral column and head unilaterally; laterally flex vert. column |
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Semispinalis (a transversospinalis)
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Innervation: posterior rami of spinal nerves
Action: extends head and cervical-thoracic vert. column rotates vertebrae contralaterally |
includes semispinalis capitis
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Multifidous
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Innervation: posterior rami of spinal nerves
Action: stabilize vertebra during local movements |
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Rotatores
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Innervation: posterior rami of spinal nerves
Action: stabilize vertebrae assist local rotation and extension |
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Pectoralis Major
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Innervation: upper by lateral pectoral n., lower by medial pectoral
Action: adduct and medially rotate humerus |
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Pectoralis Minor
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Innervation: medial pectoral nerve
Action: depressor and downward rotator of scapula |
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