Lab Exam 2 Muscles

Question 1

Frontalis

Answer 1

O: galea aponeurotica
I: skin of eyebrows
A: raises eyebrows; wrinkles forehead

Question 2

Orbicularis Oculi

Answer 2

O: frontal and maxillary bones
I: eyelids
A: closes eye; squinting

Question 3

Zygomaticus

Answer 3

O: Zygomatic Bone
I: corner of lips
A: raises corner of lips in smiling

Question 4

risorius

Answer 4

O: fascia in cheek
I: corner of lips
A: moves corner of lip laterally

Question 5

orbicularis oris

Answer 5

O: encircles mouth
I: encircles mouth
A: closes and purses lips

Question 6

buccinator

Answer 6

O: maxilla and mandible
I: orbicularis oris
A: compresses cheeks

Question 7

Platysma

Answer 7

O: fascia of chest
I: lower margin of mandible
A: tenses skin of neck

Question 8

Masseter

Answer 8

O: zygomatic arch
I: ramus of mandible
A: elevates mandible

Question 9

Temporalis

Answer 9

O: temporal and parietal bones
I: coronoid process of mandible
A: elevates mandible

Question 10

Digastric

Answer 10

O: Mastoid process of temporal bone
I: lower margin of mandible
A: primary depressor of mandible; elevates hyoid during swallowing

Question 11

Mylohyoid

Answer 11

O: Medial surface of mandible
I: midline
A: elevates floor of mouth

Question 12

Sternohyoid

Answer 12

O: manubrium of sternum
I: hyoid
A: depresses hyoid

Question 13

thyrohyoid

Answer 13

O: thyroid cartilage
I: hyoid bone
A: depresses hyoid

Question 14

sternothyroid

Answer 14

O: manubrium of sternum
I: thyroid cartilage
A: depresses thyroid cartilage

Question 15

sternocleidomastoid

Answer 15

O: manubrium of sternum and medial clavicle
I: mastoid process of temporal bone
A: flexes and rotates head

Question 16

Splenius capitis

Answer 16

O: spinous processes of upper thoracic vertebrae
I: mastoid process of temporal bone
A: extension and rotation of head

Question 17

semispinalis capitis

Answer 17

O: lower cervical vertebrae
I: occipital bone
A: extends head

Question 18

Scalenes

Answer 18

O: transverse processes of cervical vertebrae
I: first two ribs
A: flex and rotate neck; elevates first two ribs

Question 19

diaphragm

Answer 19

O: inferior ribs, sternum and costal cartilages
I: central tendon
A: increases volume of thoracic cavity when inhaling

Question 20

external intercostals

Answer 20

O: inferior border of each rib
I: superior border of rib below
A: elevates ribs when inhaling

Question 21

Internal intercostals

Answer 21

O: superior border of each rib
I: inferior border of each rib above
A: depresses rib when exhaling

Question 22

external oblique

Answer 22

O: distal margins of lower ribs
I: linea alba; inguinal ligament
A: flex abdomen; compresses abdomen; rotates abdomen

Question 23

internal oblique

Answer 23

O: iliac crest
I: linea alba; inguinal ligament
A: flex abdomen; compress abdomen; rotate abdomen

Question 24

Transverse abdominis

Answer 24

O: lumbar vertebrae
I: linea alba; inguinal ligament
A: flex abdomen; compress abdomen

Question 25

Rectus abdominus

Answer 25

O: pubic symphysis
I: costal cartilages
A: flex abdomen; compress abdomen

Question 26

erector spinae

Answer 26

O: iliac crest; transverse and spinous processes of lumbar and thoracic vertebrae
I: transverse and spinous processes of cervical vertebrae
A: extend vertebral column

Question 27

Quadratus lumborum

Answer 27

O: iliac crest
I: transverse process of upper lumbar vertebrae and rib 12
A: flexes vertebral column laterally