Chapter 10 Muscles

Question 1

frontalis (frontal belly)

Answer 1

raises the eyebrows

Question 2

orbicularis oculi

Answer 2

closes eyes, blinking

Question 3

zygomaticus (major and minor)

Answer 3

smiling muscle

Question 4

risorius

Answer 4

draws corner of lip laterally

Question 5

orbicularis oris

Answer 5

closes lips, kissing,

Question 6

buccinator

Answer 6

compresses cheek as in whistling and sucking

Question 7

Mastication

Answer 7

chewing, 4 pairs of muscles involved, masseter and temporalis muscles are prime movers

Question 8

masseter

Answer 8

prime mover of jaw closure

Question 9

temporalis

Answer 9

closes jaw

Question 10

sternocleidomastoid

Answer 10

major head flexors; flexes and laterally rotates the head

Question 11

external intercostal muscles

Answer 11

considered inspiratory muscles; pull ribs toward one another to elevate rib cage

Question 12

diaphragm

Answer 12

most important muscle of inspiration; prime mover of inspiration

Question 13

internal intercostals

Answer 13

draws ribs together and depress rib cage

Question 14

rectus abdominis

Answer 14

flex and rotate lumbar region of vertebral column

Question 15

transversus abdominis

Answer 15

compresses abdominal contents

Question 16

trapezius

Answer 16

stabilizes, elevates, retracts and rotates scapula

Question 17

pectoralis major

Answer 17

adducts and medially rotates arm

Question 18

deltoid

Answer 18

site for intramuscular injection; prime mover of arm abduction

Question 19

triceps brachii

Answer 19

powerful forearm extensor

Question 20

biceps brachii

Answer 20

flexes and supinates forearm

Question 21

brachialis

Answer 21

a major forearm flexor

Question 22

quadriceps femoris

Answer 22

powerful knee extensor used in climbing, jumping, running and rising from seated position

Question 23

rectus femoris

Answer 23

extends the leg and flexes thigh at hip

Question 24

vastus lateralis

Answer 24

intramuscular injection site, extends and stabilizes leg

Question 25

vastus medialis

Answer 25

extends leg

Question 26

gluteus medius

Answer 26

intramuscular injection site, abducts and medially rotates thigh

Question 27

gluteus maximus

Answer 27

major extensor of thigh

Question 28

hamstrings

Answer 28

fleshy muscles of the posterior thigh, cross hip and knee joints and are prime movers of thigh extension and knee flexion

Question 29

biceps femoris

Answer 29

extends thigh and flexes leg

Question 30

semitendinosus

Answer 30

extends thigh and flexes leg

Question 31

semimembranosus

Answer 31

extends thigh and flexes leg