Skeletal muscle- upper extremity

Question 1

what are the 3 primary groups of upper extremity muscles?

Answer 1

arm movers
forearm movers
hand movers

Question 2

Arm movers

Answer 2

-shoulder muscles
-rotator cuff muscles

[supraspinatus, infraspinatus, teres minor, subscapularis, teres major, deltoid]

Question 3

supraspinatus

Answer 3

origin: scapula
insertion: humerus
action: abducts humerus

Question 4

infraspinatus

Answer 4

origin: scapula
insertion: humerus
action: lateral rotation of humerus

Question 5

teres minor

Answer 5

origin: scapula
insertion: humerus
action: lateral rotation of humerus

Question 6

subscapularis

Answer 6

origin: scapula
insertion: humerus
action: medial rotation of humerus

Question 7

teres major

Answer 7

origin: scapula
insertion: humerus
action: extension, adduction, and medial rotation of humerus

Question 8

deltoid

Answer 8

origin: clavicle & scapula
insertion: humerus
action: abducts humerus

Question 9

biceps brachii

Answer 9

origin:
short head- scapula
long lateral head- scapula

insertion: radius
action: flexes forearm (elbow)

Question 10

coracobrachialis

Answer 10

origin: scapula
insertion: humerus
action: adducts humerus

Question 11

brachialis

Answer 11

origin: humerus
insertion: ulna
action: flexes forearm (elbow)

Question 12

triceps brachii

Answer 12

origin:
long head- scapula
lateral head- humerus
medial head- humerus

insertion: ulna
action: extends forearm (elbow)

Question 13

brachioradialis

Answer 13

origin: humerus
insertion: radius
action: flexes forearm (elbow)

Question 14

pronator teres

Answer 14

origin: humerus
insertion: radius
action: pronates forearm

Question 15

flexor carpi radialis

Answer 15

origin: humerus
insertion: metacarpals
action: flexes wrist

Question 16

palmaris longus

Answer 16

origin: humerus
insertion: palmar aponeurosis
action: flexes wrist

Question 17

flexor carpi ulnaris

Answer 17

origin: humerus
insertion: carpal & metacarpal bones
action: flexes wrist

Question 18

flexor digitorum superficialis

Answer 18

origin: humerus
insertion: phalanges
action: flexes phalanges

Question 19

flexor digitorum profundus

Answer 19

origin: ulna
insertion: phalanges
action: flexes phalanges

Question 20

flexor pollicis longus

Answer 20

origin: radius
insertion: pollex
action: flexes pollex

Question 21

extensor carpi radialis longus

Answer 21

origin: humerus
insertion: metacarpal 2
action: extend wrist

Question 22

extensor carpi radialis brevis

Answer 22

origin: humerus
insertion: metacarpal 3
action: extend wrist

Question 23

extensor digitorum

Answer 23

origin: humerus
insertion: phalanges
action: extend phalanges

Question 24

extensor digiti minimi

Answer 24

origin: humerus
insertion: proximal phalanx of finger 5
action: extend finger 5

Question 25

extensor carpi ulnaris

Answer 25

origin: humerus
insertion: metacarpal
action: extend wrist

Question 26

The muscle of the brachial region that causes extension at the elbow is:

Answer 26

triceps brachii

Question 27

muscle pairs of biceps brachii and brachialis are described as:

Answer 27

synergistic

[work together to create movement]

Question 28

name the rotator cuff muscles

Answer 28

Subscapularis.
Infraspinatus.
Teres minor.
Supraspinatus.

Question 29

True or false?
the triceps brachii crosses both the shoulder and elbow joints

Answer 29

True

Question 30

The wrist flexor that is missing in ~10% of the population is:

Answer 30

palmaris longus

Question 31

identify the white and black arrow

Answer 31

white- palmaris longus
black- flexor carpi radialus