Block 1: Muscles & Functions

Question 1

frontalis

Answer 1

raise eyebrows

Question 2

occipitalis

Answer 2

pulls scalp posteriorly

Question 3

orbicularis oculi

Answer 3

closes eye

Question 4

orbicularis oris

Answer 4

closes and protrudes lips

Question 5

buccinator

Answer 5

manipulate food during chewing

expels air through pursed lips

Question 6

zygomaticus major

Answer 6

pulls angle of mouth superiorly and laterally

Question 7

zygomaticus minor

Answer 7

raises lateral portion of upper lip

Question 8

platysma

Answer 8

depresses lower lip
depresses mandible
tenses skin of neck

Question 9

masseter

Answer 9

elevates mandible

Question 10

temporalis

Answer 10

elevates and retracts mandible

Question 11

diagastric

Answer 11

depresses mandible

fixator of hyoid bone during swallowing

Question 12

mylohyiod

Answer 12

elevates hyoid bone & floor of mouth

assist tongue in pushing food towards the pharynx

Question 13

sternohyoid

Answer 13

depresses hyoid bone and larynx

Question 14

sternocleidomastoid (bilateral action)

Answer 14

bilateral action (together) = flexes head

Question 15

sternocleidomastoid (unilateral action)

Answer 15

unilateral action (singular) = flex and rotate head toward opposite side

Question 16

anterior, middle, and posterior scalene (bilateral action)

Answer 16

bilateral action (together) =
flexes head
elevate rib cage with vertebral column during forced inspiration

Question 17

anterior, middle, and posterior scalene (unilateral action)

Answer 17

unilateral action (individual) = rotate head laterally

Question 18

external oblique (unilateral action)

Answer 18

unilateral action (individual) = laterally bends the trunk

Question 19

internal oblique (unilateral action)

Answer 19

unilateral action (individual) = laterally bends the trunk

Question 20

transverse abdominus (unilateral action)

Answer 20

unilateral action (individual) = laterally bends the trunk

Question 21

external oblique, internal oblique, and transverse abdominus (bilateral action)

Answer 21

bilateral action (together) = 
flexes the trunk
with vertebral column fixed, compresses the contents of the abdomen

Question 22

linea alba (what is it)

Answer 22

vertical white line on abdomin

Question 23

tendinous intersections (what is it)

Answer 23

lateral white lines on abdomin

Question 24

Rectus sheath (what is it)

Answer 24

covering of rectus abdominus

Question 25

pectoralis major

Answer 25

flexes & adducts the arm | rotates arm medially

Question 26

pectoralis minor

Answer 26

protracts and depresses the scalpula

Question 27

serratus anterior

Answer 27

protracts scapula | assists in upward rotation of scapula

Question 28

diaphram

Answer 28

flattens to lower floor of thoracic cavity, increasing volume

Question 29

external intercostals

Answer 29

elevates rib cage

Question 30

trapezious

Answer 30

extends the head retracts the scapula depresses scapula rotates scapula upward

Question 31

deltoid

Answer 31

abducts the arm | secondarily flexes and extends arm

Question 32

latissimus dorsi

Answer 32

adducts & extends the arm

Question 33

supraspinatus (function & component of what?)

Answer 33

Function = assists in abduction of arm holds the humerus & stabilizes shoulder joint Component of = rotator cuff muscles

Question 34

infraspinatus (function & component of what?)

Answer 34

Function = rotates arm laterally stabilizes shoulder joint Component of = rotator cuff muscles

Question 35

subscapularis (function & component of what?)

Answer 35

Function = adducts & rotates arm medially stabilizes shoulder joint Component of = rotator cuff muscles

Question 36

teres minor (function & component of what?)

Answer 36

Function = rotates arm laterally stabilizes shoulder joint Component of = rotator cuff muscles

Question 37

levator scapulae

Answer 37

elevates scapula

Question 38

Rhomboid Major & Minor

Answer 38

retracts scapula

Question 39

Teres Major

Answer 39

adducts & extends arm | rotates arm medially

Question 40

splenius capitis

Answer 40

extends the head | rotates the head to the same side