Chapter 6 Muscles

Question 1

Biceps Brachii

Answer 1

Supinates forearm, flexes elbom

Question 2

Brachialis

Answer 2

elbow flexion

Question 3

Brachioradialis

Answer 3

elbow flexion (weak muscle)

Question 4

Triceps brachii

Answer 4

extends elbow (antagonist to biceps brachii)

Question 5

Flexor Carpi

Answer 5

wrist flexion

Question 6

Extensor carpi

Answer 6

wrist extension

Question 7

Flexor digitorum

Answer 7

finger flexion

Question 8

extensor digitorum

Answer 8

finger extension

Question 9

Gluteus Maximus

Answer 9

Hip extension

Question 10

Gluteus medius

Answer 10

hip abduction (steadies pelvis when walking)

Question 11

Ilopsoas

Answer 11

Hip flexion (keeps the upper body from falling backwards when standing erect

Question 12

Hamstring Muscles

Answer 12

thigh extensions and knee flexion

• Biceps Femoris
• Semimembranosus
• Semitendinosus

Question 13

Saritorius

Answer 13

flexes the thigh

Question 14

Quadricep Muscles

Answer 14

extends the knee

• rectus femoris
• vastus muscles (lateralis, medialis, intermedius)

Question 15

Tibialis anterior

Answer 15

dorsiflexion and foot inversion

Question 16

Extensor digitorum longus

Answer 16

toe extension and dorsiflexion of the foot

Question 17

Fibularis muscles

Answer 17

plantar flexion and foot eversion

Question 18

Soleus

Answer 18

plantar flexion

Question 19

Frontalis

Answer 19

raises eyebrows

Question 20

orbiularis oculi

Answer 20

closes eyes, squints, blinks, winks

Question 21

orbicularis oris

Answer 21

closes mouth and protrudes the lips (smooches)

Question 22

buccinator

Answer 22

flattens the cheek, chews

Question 23

Zygomaticus

Answer 23

raises corners of the mouth

Question 24

Masseter

Answer 24

closes the jaw and elevates mandible; chews

Question 25

Temporalis

Answer 25

synergist of the masseter, closes jaw; chews.

Question 26

Platysma

Answer 26

pulls the corners of the mouth inferiorly (frown)

Question 27

Sternocleidoastoid

Answer 27

flexes the neck, rotates the head

Question 28

Trapezius

Answer 28

elevates, depresses, adducts, and stabilizes the scapula (posterior)

Question 29

Latissimus dorsi

Answer 29

extends and adducts the humerus (posterior)

Question 30

Erector spinae

Answer 30

back extension (posterior)

Question 31

Quadratus lumborum

Answer 31

flexes the spine laterally (posterior)

Question 32

Deltoid

Answer 32

arm adduction (posterior)

Question 33

Muscles that arise from the shoulder girdle and cross the shoulder joint to insert into the humerus

Answer 33

Pectoralis major Latissimus dorsi deltoid

Question 34

Pectoralis major

Answer 34

adducts and flexes the humerus

Question 35

Intercostal muscles

Answer 35

* eternal intercostals--raise rib cage during inhalation | * Internal intercostals--depress the rib

Question 36

Rectus abdominis

Answer 36

flexes vertebral column and compresses abdominal contents

Question 37

external oblique

Answer 37

flex vertebral column; rotate trunk and bend it laterally

Question 38

internal oblique

Answer 38

flex vertebral column; rotate the trunk and bend it laterally

Question 39

Transversus abdominis

Answer 39

compresses abdominal contents