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Anatomy 6511 > Muscle actions > Flashcards

Flashcards in Muscle actions Deck (43)
1

Pronator teres

pronates forearm

Median nerve

2

Flexor carpi radialis

Action = flexion and ABduction of wrist
Innervation = median nerve

3

Palmaris longus

Action = flex wrist & tense aponeurosis (the aponeurosis attaches to the skin and thus flexion of the palmaris longus tenses the palm, helps improve grip by resisting shearing forces).
Innervation = median nerve

4

Flexor digitorum superficialis

Action = quick flexion of proximal interphalangeal joints (PIPs) & metacarpophalangeal joints (MPs) of digits 2-5.
Innervation = median nerve.

5

Flexor carpi ulnaris

Action = flex and ADDuct wrist
Innervation = ulnar nerve

6

Flexor digitorum profundus

Action = slow flexion of distal interphalangeal joints (DIPs) and MPs of digits 2-5
Innervation = digits 2-3 are innervated by the median nerve while the digits 4-5 are innervated by the ulnar nerve

7

Flexor digitorum superficialis

Action = quick flexion of proximal interphalangeal joints (PIPs) & metacarpophalangeal joints (MPs) of digits 2-5.
Innervation = median nerve.

8

Pronator quadratus

pronation, median nerve

9

Brachioradialis

Action = accessory flexor at elbow
Innervation = radial nerve

10

Anconeus

Action = accessory extensor at elbow joint
Innervation = radial nerve

11

Extensor carpi radialis longus

Action = extends & ABducts wrist
Innervation = radial nerve

12

Extensor carpi radialis brevis

Action = extends & ABducts wrist
Innervation = radial nerve

13

Extensor digitorum

Action = extends digits 2-5
Innervation = radial nerve

14

Extensor digiti minimi

Action = extend digit 5
Innervation = radial nerve

15

Extensor carpi ulnaris

Action = extend & ADDuct wrist
Innervation = radial nerve

16

Supinator

Action = supination
Innervation = radial nerve

17

Abductor pollicis longus

Action = ABducts 1st MP joint (of thumb)
Innervation = radial nerve

18

Extensor pollicis brevis

Action = extend MP joint of 1st digit
Innervation = radial nerve

19

Extensor pollicis longus

Action = extend all joints of thumb
Innervation = radial nerve

20

Extensor indicis

Action = extend index finger
Innervation = radial nerve

21

Biceps Brachii M.

A: flexes & supinates forearm (slight arm flexion)
N: musculocutaneous n. & brachial vessels

22

Coracobrachialis M.

A: flexes arm
N: musculocutaneous n. & brachial vessels

23

Brachialis M.

A: flexes forearm
N: radial & musculocutaneous nn. & brachial vessels

24

Triceps Brachii M.


A: extends forearm
N: radial n. & deep brachial vessels

25

Trapezius

A: elevates, depresses & retracts scapula

N: accessory n. (CN XI) & C3, C4; & transverse cervical vessels

Accessory n. (CNXI):
runs deep to m., posteroinferiorly from jugular foramen
Ventral rami of C3-C4:
runs deep to m., posteriorly from intervertebral foramina
Transverse cervical a. & v.:
runs deep to m., posterolaterally from thyrocervical trunk

26

Latissimus Dorsi

A: adducts, extends & medially rotates humerus

N: thoracodorsal n. & vessels & intercostal vessels

27

Levator Scapulae

A: elevates scapula

N: C3, C4, & dorsal scapular n. & vessels

28

Rhomboids

A: retract (adducts) & elevates scapula

N: dorsal scapular n. & vessels

29

Splenius capitus & cervicis (spinotransversales mm.)

Cervical
Capitis: Bilaterally - draw head backward and extend neck; individually – rotate head/face ipsilaterally
Cervicis: Bilaterally - extend neck; individually – rotate head/face ipsilaterally



N: Posterior rami of the middle and

30

Erector Spinae Mm.

A: erect spine (postural mm.) 1° extensors of spine & head
N: dorsal rami of spinal nn. & lumbar & intercostal vessels

31

Multifidus M.

A: laterally flexes & rotates spine*

N: dorsal rami of spinal nn. & lumbar vessels

32

Rotatores M.

A: rotate spine*
Bilaterally – extend vertebral column

N: dorsal rami of spinal nn. & intercostal vessels

33

Serratus Anterior M.

A: protracts scapula & holds it to body wall
N: long thoracic n. & lateral thoracic vessels

34

Triangle of Auscultation

Superior = Trapezius m.
Inferior = Latissimus dorsi m.
Lateral = Rhomboid major m.
Floor (deep) = 6th intercostal space

35

Lumbar triangle

Medial = Latissimus dorsi m.
Lateral = External oblique m.
Inferior = Iliac crest
Floor (deep) = Internal oblique m.

36

Deltoid M.

A: abducts humerus (1°), flexes, extends & rotates humerus (2°)
N: Axillary n. & Post. Circumflex Humeral vessels

37

Teres Major M.

A: medially rotates & extends humerus
N: Lower (inferior) Subscapular n. & subscapular vessels

38

Supraspinatus M.

A: abducts humerus
(1st 15°)

N: Suprascapular n. & vessels & dorsal scapular vessels

39

Infraspinatus M.

A: laterally rotates humerus

N: Suprascapular n. & vessels & subscapular vessels

40

Teres Minor M.

A: lateral rotation of humerus

N: Axillary n. & suprascapular & subscapular vessels

41

Subscapularis M.

A: medial rotation of humerus

N: upper & lower subscapular nn. & subscapular vessels

42

Pectoralis Major M.

A: adducts& medially rotates humerus
N: med. & lat. pectoral nn. & thoracoacrominal vessels

43

Pectoralis Minor M.

A: protracts scapular
N: Medial Pectoral n. & Thoracoacromial vessels