Muscles And Actions Upper Limb

Question 1

Pectoralis major

Answer 1

Adducts and medially rotates the upper limb
Draws scapula anteroinferiorly
Clavicular head acts to flex upper lib

Question 2

Pectoralis minor

Answer 2

Stabilises the scapula by drawing it anteroinferiorly against the thoracic wall

Question 3

Serratus anterior

Answer 3

Rotates the scapula and allows arm to be raised over 90 degrees
Hold scapula against the rib cage

Question 4

Subclavius

Answer 4

Anchors and depresses the clavicle

Question 5

Deltoid- anterior fibres

Answer 5

Flexion and medial rotation

Question 6

Deltoid- posterior fibres

Answer 6

Extension and lateral rotation

Question 7

Deltoid- medial fibres

Answer 7

The major abductor of the arm (takes over from supraspinatus at 15 degrees)

Question 8

Teres major

Answer 8

Abducts the arm 0-15 degrees

Assists deltoid for 15- 90 degrees

Question 9

Subscapularis

Answer 9

Medially rotates the upper arm

Question 10

Infrascapularis

Answer 10

Laterally rotates

Question 11

Supraspinatus

Answer 11

Abducts the arm 0-15 degrees

Question 12

Teres minor

Answer 12

Laterally rotates the arm

Question 13

Suprasinatus

Answer 13

Abducts the arm0-15 degrees and si it’s deltoid for 15-90

Question 14

Trapezius - upper fibres

Answer 14

Elevate the scapula and rotate it during abduction of the arm

Question 15

Trapezius- middle fibres

Answer 15

Retract the scapula

Question 16

Trapezius- lower fibres

Answer 16

Pull scapula inferiorly

Question 17

Latissimus dorsi

Answer 17

Extends adducts and medially rotates the upper limb

Question 18

Levator scapulae

Answer 18

Elevates the scapula

Question 19

Rhomboid major

Answer 19

Retracts and rotates the scapula

Question 20

Rhomboid minor

Answer 20

Retracts and rotates the scapula

Question 21

Biceps brachii

Answer 21

Supination of forearm flexes arm at the elbow and at the shoulder

Question 22

Coracobrachialis

Answer 22

Flexion of arm at the shoulder and weak adduction

Question 23

Brachialis

Answer 23

Flexion at the elbow

Question 24

Triceps brachii

Answer 24

Extension of arm at the elbow

Question 25

Flexor carpi ulnaris

Answer 25

Flexion and adduction at the wrist

Question 26

Palmaris longus

Answer 26

Flexion at the wrist

Question 27

Flexor carpi radialis

Answer 27

Flexion and abduction at the wrist

Question 28

Pronator teres

Answer 28

Pronation of the forearm

Question 29

Flexor digitorium superficialis

Answer 29

Flexes digits at MCPJ and PIPJ and flexes at the wrist

Question 30

Flexor digitorium profundus.

Answer 30

Flexes DIPJ and wrist and MCPJ

Question 31

Flexor pollucis longus

Answer 31

Flexes IPJ and MCPJ of the thumb

Question 32

Pronator quadratus

Answer 32

Pronates the forearm

Question 33

Flexor digitorium superficialis

Answer 33

Flexes MCPJ PIPJ and wrist

Question 34

Flexor digitorium profundus

Answer 34

Flex distal interphalangeal joints of the fingers also flexes MCPJ

Question 35

Flexor pollucis longus

Answer 35

Flexes all the joints of the thumb

Question 36

Pronator quadratus

Answer 36

Pronates the forearm

Question 37

Opponens pollucis

Answer 37

Opposes the thumb by medially rotating and flexing the metacarpal on the trapezium

Question 38

Abductor pollucis brevis

Answer 38

Abducts the thumb

Question 39

Flexor pollucis brevis

Answer 39

Flexes MCPJ of thumb

Question 40

Opponents digiti minimi

Answer 40

Rotates metacarpal of little finger into palm (opposition)

Question 41

Abductor digiti minimi

Answer 41

Abducts the little finger

Question 42

Flexor digiti minimi brevis

Answer 42

Flexes MCPJ of little finger

Question 43

Lumbricals

Answer 43

Flex at MCPJ and extend at the IPJ of each finger

Question 44

Dorsal interossei

Answer 44

Abducts the fingers at MCPJ

Question 45

Palmar interossei

Answer 45

Adducts fingers at MCPJ