ch 1 muscles

Question 1

occipitofrontalis

Answer 1

facial expression - scalp muscles

frontal belly: draws scalp anteriorly, raises eyebrows and wrinkles skin or forehead

occipital: draw scalp posteriorly

Question 2

orbicularis oris

Answer 2

facial expression - mouth muscle

closes and protrudes lips (kissing), compresses lips against teeth, shapes lips during speech

Question 3

orbicularis oculi

Answer 3

facial expression - orbit muscle

• closes eye

Question 4

platysma

Answer 4

facial expression - neck muscle

• draws outer part of lips inferiorly and posteriorly (pouting)

Question 5

masseter

Answer 5

mandible
- elevates mandible, closes mouth

Question 6

temporalis

Answer 6

mandible
- elevates and retracts mandible

Question 7

sternocleidomastoid

Answer 7

head
- divides neck into two principal triangles, anterior and posterior
- bilaterally: flex cervical (neck) portion of vertebral column, extend head
- unilaterally: flex neck and head to same side rotate head to side opposite of contracting muscle

Question 8

external abdominal oblique

Answer 8

abdominal muscle

bilaterally: compress abdomen and flex vertebral column
unilaterally: laterally flex vertebral column

Question 9

internal abdominal oblique

Answer 9

abdominal muscle

bilaterally: compress abdomen and flex vertebral column
unilaterally: laterally flex vertebral column

Question 10

rectus abdominus

Answer 10

abdominal muscle
flexes vertebral column, compresses abdomen to aid in defecation, urination, forced exhalation and childbirth

Question 11

transverse abdominus

Answer 11

abdominal muscle
- compresses abdomen