skeletal muscles and their functions

Question 1

orbicularis oris

Answer 1

closes lips

Question 2

orbicularis oculi

Answer 2

closes eyes

Question 3

sternocleidomastoid

Answer 3

rotates the head and flexes the neck

Question 4

masseter

Answer 4

most powerful muscle of mastication. closes and retracts the jaw

Question 5

temporalis

Answer 5

closes the mouth and pulls the jaw posteriorly

Question 6

lateral pterygoid

Answer 6

working together, they protract the jaw and move the jaw side to side and open

Question 7

medial pterygoid

Answer 7

helps close jaw

Question 8

pectoralis major

Answer 8

abducts and medially rotates arm

Question 9

rectus adominis

Answer 9

flex and rotate lumbar region

Question 10

trapezius

Answer 10

stabilizes elevates, retracts, and rotates scapula

Question 11

external oblique

Answer 11

rotate the trunk and compress the abdominal wall

Question 12

latissimus dorsi

Answer 12

prime mover of arm extension; powerful arm adductor; medially rotates arm at shoulder

Question 13

intercostals

Answer 13

elevate and depress rib cage

Question 14

deltoid

Answer 14

prime mover of arm abduction

Question 15

biceps brachii

Answer 15

flexes and supinates forearm

Question 16

triceps brachii

Answer 16

forearm extensor

Question 17

pronator teres

Answer 17

pronates forearm

Question 18

extensor digitorum

Answer 18

prime mover of finger extension

Question 19

gluteus maximus

Answer 19

major extensor of thigh

Question 20

rectus femoris

Answer 20

extends leg and flexes thigh at hip

Question 21

gastrocnemius

Answer 21

plantar flexes foot

Question 22

sartorius

Answer 22

flexes, abducts, and laterally rotates thigh

Question 23

tensor fascia latae

Answer 23

steadies the leg

Question 24

soleus

Answer 24

plantar flexes foot

Question 25

tibialis anterior

Answer 25

prime mover of dorsiflexion