actions

Question 1

pectorals major action

Answer 1

prime mover of arm flexion; medially rotates and adducts the arm

Question 2

deltoid actions

Answer 2

prime mover of arm abduction when all fibres contract simultaneously
 flexes and medially rotates the arm when anterior fibres contract only
 extends and laterally rotates the arm when posterior fibres contract only

Question 3

latissimus dorsi acti

Answer 3

prime mover of arm extension; adducts and medially rotates the arm

Question 4

tres major

Answer 4

extends, medially rotates and adducts the arm

Question 5

coracobrachiolais

Answer 5

flexes and adducts the arm

Question 6

supraspinatus

Answer 6

abducts the arm

Question 7

infraspinatus

Answer 7

laterally rotates the arm

Question 8

tres minor

Answer 8

laterally rotates the arm

Question 9

subscapularis

Answer 9

medially rotates the arm (prime mover)

Question 10

brachioalis

Answer 10

flexes the forearm (prime mover

Question 11

biceps brachii

Answer 11

flexes and supinates the forearm (prime mover); helps stabilise the shoulder joint

Question 12

brachioradialis

Answer 12

flexes the forearm (synergist)

Question 13

trcieps brachii

Answer 13

extends the forearm (prime mover)

Question 14

flexor carpi radialis

Answer 14

flexes and abducts the hand (prime mover)

Question 15

flesxor carpi ulnaris

Answer 15

flexes and adducts the hand (prime mover)

Question 16

palmaris longus

Answer 16

: flexes the hand

Question 17

extensor capri radialis longus

Answer 17

extends and abducts the hand

Question 18

extensor carpi radialis brevis

Answer 18

extends and abducts the hand

Question 19

extensor carpi ulnaris

Answer 19

extends and adducts the hand

Question 20

flexor digitorum superfiicilais

Answer 20

flexes each finger at the proximal interphalangeal (PIP) joint

Question 21

flexor digiotrum profundus

Answer 21

flexes each finger at the distal interphalangeal (DIP) joint

Question 22

flexor pollicus longus

Answer 22

flexes the thumb at the interphalangeal joint

Question 23

extensor digitorum

Answer 23

extends each finger at the DIP and PIP joints

Question 24

extensor digiti minimi

Answer 24

extends little finger at the metacarpophalangeal (MCP) joint

Question 25

extensor pollicus longus

Answer 25

extends the thumb at the interphalangeal joint

Question 26

extensor pollicus brevis

Answer 26

extends the thumb at the metacarpophalangeal joint

Question 27

abductor pollicus longus

Answer 27

abducts and extends the thumb at the carpometacarpal joint

Question 28

thenar mussels

Answer 28

Flexor pollicis brevis  Flexes the thumb at the metacarpophalangeal and carpometacarpal joints Abductor pollicis brevis  Abducts thumb at the carpometacarpal joint Adductor pollicis  Adducts the thumb at the metacarpophalangeal and carpometacarpal joints Opponens pollicis  Opposition – moves thumb across palm to meet little finger

Question 29

hypothenar muscles

Answer 29

Flexor digiti minimi brevis  Flexes little finger at the metacarpophalangeal joint Abductor digiti minimi  Abducts little finger at the metacarpophalangeal joint Opponens digiti minimi  Helps in opposition – moves little finger across the palm to meet the thumb

Question 30

midpalm muscles

Answer 30

Lumbricals  Four worm‐shaped muscles in the palm  Flex each finger at the metacarpophalangeal joint  Extend each finger at the interphalangeal joint Palmar interossei  Four long shaped muscles in the spaces between the metacarpals, superficial to dorsi interossei  Adducts fingers Dorsi Interossei  Four bipennate muscles in the spaces bewteen metacarpals, deepest palm muscles  Abducts fingers