Muscle actions Flashcards
1
Q
Pronator teres
A
pronates forearm
Median nerve
2
Q
Flexor carpi radialis
A
Action = flexion and ABduction of wrist Innervation = median nerve
3
Q
Palmaris longus
A
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
Q
Flexor digitorum superficialis
A
Action = quick flexion of proximal interphalangeal joints (PIPs) & metacarpophalangeal joints (MPs) of digits 2-5. Innervation = median nerve.
5
Q
Flexor carpi ulnaris
A
Action = flex and ADDuct wrist Innervation = ulnar nerve
6
Q
Flexor digitorum profundus
A
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
Q
Flexor digitorum superficialis
A
Action = quick flexion of proximal interphalangeal joints (PIPs) & metacarpophalangeal joints (MPs) of digits 2-5. Innervation = median nerve.
8
Q
Pronator quadratus
A
pronation, median nerve
9
Q
Brachioradialis
A
Action = accessory flexor at elbow Innervation = radial nerve
10
Q
Anconeus
A
Action = accessory extensor at elbow joint Innervation = radial nerve
11
Q
Extensor carpi radialis longus
A
Action = extends & ABducts wrist Innervation = radial nerve
12
Q
Extensor carpi radialis brevis
A
Action = extends & ABducts wrist Innervation = radial nerve
13
Q
Extensor digitorum
A
Action = extends digits 2-5 Innervation = radial nerve
14
Q
Extensor digiti minimi
A
Action = extend digit 5 Innervation = radial nerve
15
Q
Extensor carpi ulnaris
A
Action = extend & ADDuct wrist Innervation = radial nerve
16
Q
Supinator
A
Action = supination Innervation = radial nerve
17
Q
Abductor pollicis longus
A
Action = ABducts 1st MP joint (of thumb) Innervation = radial nerve
18
Q
Extensor pollicis brevis
A
Action = extend MP joint of 1st digit Innervation = radial nerve
19
Q
Extensor pollicis longus
A
Action = extend all joints of thumb Innervation = radial nerve
20
Q
Extensor indicis
A
Action = extend index finger Innervation = radial nerve
21
Q
Biceps Brachii M.
A
A: flexes & supinates forearm (slight arm flexion)
N: musculocutaneous n. & brachial vessels
22
Q
Coracobrachialis M.
A
A: flexes arm
N: musculocutaneous n. & brachial vessels
23
Q
Brachialis M.
A
A: flexes forearm
N: radial & musculocutaneous nn. & brachial vessels
24
Q
Triceps Brachii M.
A
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
