Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/54

Click to flip

54 Cards in this Set

  • Front
  • Back
  • 3rd side (hint)
Coracobrachialis
Innervation: musculocutaneous n.

Actions: flexes and adducts arm
Biceps brachii
Innervation: musculocutaneous n.

Actions (primary->tertiary): flexes elbow joint,
supinates radius (forearm),
weak shoulder joint flexor
Brachialis
Innervation: musculocutaneous n.

Action: flexes elbow
Triceps brachii
Innervation: radial n.

Action: extends elbow (esp. when pushing object)
Trapezius
Innervation: CN XI (spinal accessory) joined by motor branches of C3 and C4

Action: retracts the scapula
superior and inferior fibers of the trapezius
Action: superior pulls upward on lateral angle and inferior fibers pull downward on base of spine, ROTATING GLENOID CAVITY UPWARD
middle fibers of the trapezius
Action: upward rotation and preventing the sagging of the lateral angle (glenoid cavity) of the scapula
Latissimus dorsi
Innervation: thoracodorsal n (C6-C8) motor branch of brachial plexus

Action: adduction, medial rotation, and extension of arm (swimming stroke)
Levator scapulae
Innervation: dorsal scapular n. (C3)

Action: elevates medail angle of scapula
Rhomboideus minor
Innervation: dorsal scapular n. (C5)

Action: elevates medial border and retracts scapula
Rhomboideus major
Innervation: dorsal scapular n.

Action: elevates medial border and retracts scapula
Serratus anterior
Innervation: long thoracic nerve

Action: protracts scapula
secondarily rotates scapula upward assisting in arm abduction
Pronator teres (has two heads)
Innervation: median n. (C6-C7) passes between two heads

Action: pronates hand
Flexor carpi radialis
Innervation: median nerve (C6-C7)

Action: flexor and radial abductor of the wrist
Palmaris longus (absent in 7% of population)
Innervation: median n. (C6-C7)

Action: flexes wrist
Flexor carpi ulnaris (has two heads)
Innervation: ulnar n. (C8 and T1)

Action: flexor and ulnar abductor of wrist
Flexor digitorum superficialis
Innervation: median nerve (C7-T1)

Action: flexes middle phalanges (virtue of fact that tendon crosses proximal interphalangeal (PIP) joint
Flexor policis longus
Innervation: anterior interosseous branch of the median n. (C7-T1)

Action: flexes proximal and distal phalanges of thumb
Flexor digitorum profundus
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)
Pronator quadratus
Innervation: anterior interosseous branch of the of the median n. (C7-T1)

Action: pronates hand
Brachioradialis
Innervation: radial n.

Action: flexor of elbow
Extensor carpi radialis longus
Innervation: radial n. (C6-C7)

Action: extensor and radial abductor of wrist
Extensor carpi radialis brevis
Innervation: posterior interosseous n., a branch of the radial n. (C6-C7)

Action: extensor and radial abductor of wrist
Extensor digitorum and Extensor digiti minimi
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
Extensor carpi ulnaris
Innervation: posterior interosseous n.

Action: extensor and ulnar abductor of wrist
Supinator
Innervation: posterior interosseous n.

Action: supination of the hand
Abductor pollicis longus
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
Extensor pollicis brevis
Innervation: posterior interosseous n.

Action: radial abductor of wrist,

extensor of proximal phalanx of thumb

extensor of first metacarpal
Extensor pollicis longus
Innervation: posterior interosseous n.

Action: extends distal and proximal phalanges of thumb

extends and abducts first metacarpal
Extensor indicis
Innervation: posterior interosseous n.

Action: extends all joints of index finger

independently abducts index finger
Infraspinatus
Innervation: suprascapular n.

Action: lateral rotation of arm
Teres Minor Muscle
Innervation: axillary n.

Action: lateral rotation of arm

weak adductor of arm
Deltoid muscle
Innervation: axillary n.

Actions: anterior flexes/medially rotates arm
middle abducts arm
posterior extend/laterally rotates arm
Supraspinatus
Innervation: suprascapular n.

Action: abducts arm
supports arm against downward pull when arm at side
Teres Major
Innervation: lower subscapular n.

Action: adduction
medial rotation
extension of arm when these actions opposed
Subscapularis
Innervation: upper and lower subscapular nn.

Action: medial rotation of arm
Opponens Pollicis
Innervation: recurrent branch of median n.

Action: opposes thumb (draws it medially to palm and rotates it medially)
Abductor Pollicis Brevis
Innervation: recurrent branch of the median n.

Action: abducts thumb
helps oppose thumb
Flexor Pollicis Brevis
Innervation: recurrent branch of median n. in superficial head, deep branch of ulnar nerve in deep branch

Action: flexes thumb
Adductor Pollicis
Innervation: deep branch of ulnar nerve

Action: adducts thumb
Abductor Digiti Minimi
Innervation: deep branch of ulnar nerve

Action: abducts 5th digit
helps flex 5th proximal phalanx
Flexor Digiti Minimi Brevis
Innervation: deep branch of the ulnar nerve

Action: flexes 5th proximal phalanx
Opponens Digiti
Innervation: deep branch of the ulnar nerve

Action: opposes 5th digit to thumb (draws anterior and rotates it)
1st and 2nd Lumbricales
Innervation: median nerve

Action: flex MP joints while extending IP joints of 2nd-5th digits
3rd and 4th Lumbricales
Innervation: deep branch of ulnar nerve

Action: flex MP joints while extending IP joints of 2nd-5th digits
Dorsal Interossei (1st, 3rd, 4th)
Innervation: deep branch of ulnar nerve

Action: abduct 2nd-4th digit from axial line
help lumbricales flex MP while extending IP
Palmar Interossei
Innervation: deep branch of the ulnar nerve

Action: adduct 2nd, 4th, and 5th digits toward axial line
help lumbricales flex MP and extend IP
Splenius Capitis and Splenius Cervicis
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
Erector Spinae muscles (from lateral to medial: iliocostalis, longissimus, spinalis)
Innervation: posterior rami of spinal nerves

Action: acting bilaterally; extend vertebral column and head
unilaterally; laterally flex vert. column
Semispinalis (a transversospinalis)
Innervation: posterior rami of spinal nerves

Action: extends head and cervical-thoracic vert. column
rotates vertebrae contralaterally
includes semispinalis capitis
Multifidous
Innervation: posterior rami of spinal nerves

Action: stabilize vertebra during local movements
Rotatores
Innervation: posterior rami of spinal nerves

Action: stabilize vertebrae
assist local rotation and extension
Pectoralis Major
Innervation: upper by lateral pectoral n., lower by medial pectoral

Action: adduct and medially rotate humerus
Pectoralis Minor
Innervation: medial pectoral nerve

Action: depressor and downward rotator of scapula