Skeletal muscle gross anatomy II

Question 1

4 rotator cuff muscles

Answer 1

SITS muscles
suprespinatus (abduction)
infraspinatus (lateral rotation)
teres minor (adduct, lateral rotation, some extension)
subscapularius (medial rotation)

Question 2

opposing muscles in rotator cuff

Answer 2

infraspinatus (lateral rotation)
subscapularius (medial rotation)

Question 4

pectoralis major origin, insertion, functions of

Answer 4

Origin: broadly along thoracic cage
Insertion: lateral side of humerus
Function: arm flexion, adduction, medial rotation, extension if arm is already flexed

Question 5

latissimus dorsi origin, insertion, functions

Answer 5

Origin: borad origin on lumbar/thoracic region
Insertion: anterior side of humerus
Function: arm extension, adduction, medial rotation

Question 6

deltoid origin, insertion, function

Answer 6

Origins: broad on clavicle and scapula
Insertion: humerus
Function: abduction, medial/lateral rotation of arm, flexion/extension

Question 7

muscles that move the forearm

Answer 7

Extension
- triceps brachii
- anconeus

Flexion
-biceps brachii
- brachioradialis
- brachialis

Supination
- supinator
- biceps brachii

Pronation
- pronator quadratus
- pronator teres

Question 8

muscles that pronate

Answer 8

pronator teres and pronator quadratus

Question 9

trips brachii origin, insertion, function

Answer 9

Origin: scapula, humerus
Insertion: olecranon process (ulna)
Function: extension of forearm

Question 10

anconeus origin, insertion, function

Answer 10

Origin: distal humerus
Insertion: olecranon process (ulna)
Function: extension of forearm

Question 11

biceps brachii origin, insertion, function

Answer 11

Origin: sacpula
Insertion: radius
Function: elbow flexion, supination

Question 12

brachioradialis origin, insertion, function

Answer 12

Origin: distal humerus
Insertion: radius
Function: elbow flexion

Question 12

brachialis origin, insertion, function

Answer 12

Origin: anterior distal humerus
Insertion: ulna
Function: elbow flexion

Question 13

3 muscles involved in elbow flexion

Answer 13

biceps brachii
brachioradialis
brachialis

Question 14

2 muscles involved in elbow flexion

Answer 14

triceps brachii
anconeus

Question 15

muscles that supinate

Answer 15

biceps brachii
supinator

Question 17

function of muscles on anterior side of forearm

Answer 17

wrist flexion
abduction
adduction

Question 18

function of muscles on posterior forearm

Answer 18

wrist extension
abduction

Question 19

intrinsic vs extrinsic muscles of hand

Answer 19

intrinsic: origin and insertion inside hand
extrinsic: have origin or insertion outside of hand

Question 20

intrinsic muscle groups in hand

Answer 20

THENAR muscles
- thumb side
HYPOTHENAR MUSCLES
- pinky side

Question 21

muscles that flex the hip

Answer 21

anterior side of femur and hip
- iliacus
- psoas major
(grouped as iliopsoas muscle)