Arm and Cubital Fossa Muscles

Question 1

what are the muscles of the arm

Answer 1

biceps brachii
brachialis
coracobrachialis
triceps brachii
anconeus

Question 2

biceps brachii

-origin

Answer 2

short head
-tip of coracoid process (with coracobrachialis)
long head
-supraglenoid tubercle of scapula

Question 3

biceps brachii

-insertion

Answer 3

tuberosity of radius

fdascia of forearm via bicipital aponeurosis

Question 4

biceps brachii

-actions

Answer 4

supinates pronated forearm
flexes supine forearm
flexes arm

Question 5

biceps brachii

-innervation

Answer 5

musculocutaneous nerve (C5-7)

Question 6

brachialis

-origin

Answer 6

distal 1/2 of anterior surface of humerus

Question 7

brachialis

-insertion

Answer 7

coronoid process of ulna

Question 8

brachialis

-actions

Answer 8

flexes forearm in all positions

main flexor of forearm

Question 9

brachialis

-innervation

Answer 9

musculocutaneous nerve (C5, C6)

Question 10

coracobrachialis

-origin

Answer 10

tip of coracoid process

Question 11

coracobrachialis

-insertion

Answer 11

middle 1/3 of medial surface of humerus

Question 12

coracobrachialis

-actions

Answer 12

arm flexion

arm adduction

Question 13

coracobrachialis

-innervation

Answer 13

musculocutaneous nerve (C5, C6)

Question 14

triceps brachii

-origin

Answer 14

long head
-infraglenoid process of scapula
lateral head
-posterior surrface of humerus, superior to radial groove
medial head
-posterior surface of humerus, inferior to radial groove

Question 15

triceps brachii

-insertion

Answer 15

proximal end of olecranon of ulna

fascia of forearm

Question 16

triceps brachii

-actions

Answer 16

extends forearm
-chief extensor of forearm
long head
-steadies head of abducted humerus
-assists in extension and adduction of arm

Question 17

triceps brachii

-innervation

Answer 17

radial nerve (C6-C8)

Question 18

anconeus

-origin

Answer 18

lateral epicondyle of humerus

Question 19

anconeus

-insertion

Answer 19

lateral surface of olecranon process

superior part of posterior surface of ulna

Question 20

anconeus

-actions

Answer 20

assists triceps in extending forearm
stabilizes elbow joint
abducts ulna during pronation

Question 21

what are the muscles of the cubital region

Answer 21

supinator
brachioradialis
pronator teres

Question 22

supinator

-origin

Answer 22

lateral epicondyle of humerus
radial collateral ligament
annular ligament
supinator fossa
crest of ulna

Question 23

supinator

-insertion

Answer 23

lateral, posterior, and anterior surfaces of proximal 1/3 of radius

Question 24

supinator

-actions

Answer 24

supinates pronated forearm

Question 25

supinator

-innervation

Answer 25

deep branch of radial nerve (C7, C8)

Question 26

brachioradialis

-origin

Answer 26

proximal 2/3 of lateral supraepicondylar ridge of humerus

Question 27

brachioradialis

-insertion

Answer 27

lateral surface of distal end of radius proximal to styloid process

Question 28

brachioradialis

-actions

Answer 28

flexes forearm

Question 29

brachioradialis

-innervation

Answer 29

radial nerve (C5-C7)

Question 30

pronator teres

-origin

Answer 30

medial epicondyle of humerus

coronoid process of ulna

Question 31

pronator teres

-insertion

Answer 31

middle of lateral surface of radius

Question 32

pronator teres

-actions

Answer 32

pronates forearm

assists in flexion of forearm

Question 33

pronator teres

-innervation

Answer 33

median nerve (C6, C7)