Muscular System P1

Question 1

SCM origin

Answer 1

Medial part of the clavicle and sternum’s superior and lateral surface

Question 2

SCM insertion

Answer 2

Mastoid process of the temporal bone

Question 3

Trapezius origin

Answer 3

External surface of the occipital bone and posterior midline of the cervical and thoracic regions

Question 4

Trapezius insertion

Answer 4

Lateral third of the clavicle and parts of the scapula

Question 5

Epicranius origin

Answer 5

Superior nuchal line of the occipital bone and the mastoid process of the temporal bone

Question 6

Epicranius insertion

Answer 6

The skin of the eyebrow and root of the nose

Question 7

Orbicularis oculi origin

Answer 7

Orbital rim
Nasal process of the frontal bone
Frontal process of the maxilla

Question 8

Orbicularis oculi insertion

Answer 8

The skin at the lateral canthus

Question 9

Corrugator supercilii origin

Answer 9

The supraorbital region of the frontal bone

Question 10

Corrugator supercilii insertion

Answer 10

The skin of the eyebrow

Question 11

Orbicularis oris origin

Answer 11

Facial modiolus at the labial commissure

Question 12

Orbicularis oris insertion

Answer 12

The tissues of the upper and lower lips

Question 13

Buccinator origin

Answer 13

Alveolar process of the maxilla
Alveolar process of the mandible
Pterygomandibular raphe/fold

Question 14

Buccinator insertion

Answer 14

The tissues of the orbicularis oris at the corners of the mouth

Question 15

Risorius origin

Answer 15

The fascia superficial to the masseter

Question 16

Risorius insertion

Answer 16

The skin at the ipsilateral labial commissure at the facial modiolus

Question 17

Levator labii superioris origin

Answer 17

The infraorbital rim of the maxilla

Question 18

Levator labii superioris insertion

Answer 18

The skin at the ipsilateral labial commissure at the facial modiolus

Question 19

Levator labii superioris alaeque nasi origin

Answer 19

The frontal process of the maxilla

Question 20

Levator labii superioris alaeque nasi insertion

Answer 20

The skin at the ala of the nose
The skin at the upper lip

Question 21

Zygomaticus major origin

Answer 21

Zygomatic bone

Question 22

Zygomaticus major insertion

Answer 22

The skin at the ipsilateral labial commissure and the facial modiolus, in and around the orbicularis oris

Question 23

Zygomaticus minor origin

Answer 23

The body of zygomatic bone, medial to zygomaticus major muscle

Question 24

Zygomaticus minor insertion

Answer 24

The skin at the upper lip adjacent to the insertion of the levator labii superioris

Question 25

Levator anguli oris origin

Answer 25

The body of the canine fossa of the maxilla, usually superior to the root of the maxillary canine

Question 26

Levator anguli oris insertion

Answer 26

The skin at the ipsilateral labial commissure at the facial modiolus

Question 27

Depressor anguli oris origin

Answer 27

The body of the inferior border of the mandible

Question 28

Depressor anguli oris insertion

Answer 28

The skin at the ipsilateral labial commissure at the facial modiolus

Question 29

Depressor labii inferioris origin

Answer 29

The body of the inferior border of the mandible

Question 30

Depressor labii inferioris insertion

Answer 30

The skin of the lower lip

Question 31

Mentalis origin

Answer 31

The anterior mandible near the midline

Question 32

Mentalis insertion

Answer 32

The skin of the chin

Question 33

Platysma origin

Answer 33

The skin superficial to the clavicle and shoulder

Question 34

Platysma insertion

Answer 34

The muscles surrounding the mouth, including the facial modiolus

Question 35

SCM action

Answer 35

- One muscle contracts: bend to the unilateral side; face and front of the neck rotate to contralateral side - Both muscles contract: head flexes at neck, and extend at the junction of the neck and skull - Elevate the thorax during breathing

Question 36

Trapezius action

Answer 36

Lift the clavicle and scapula (shrugging)

Question 37

Epicranius action

Answer 37

Raise the eyebrows and scalp (surprise expression)

Question 38

Orbicularis oculi action

Answer 38

- closing the eyelid - squinting

Question 39

Corrugator supercilii action

Answer 39

Draws the skin of the eyebrow medially and inferiorly toward the nose - vertical wrinkles in the glabella area of the forehead - horizontal wrinkles at the bridge of the nose

Question 40

Orbicularis oris action

Answer 40

- pressing lips together (closing) - tightening and thinning lips (pursing) - rolling lips inward between the teeth - pouting and thrusting lips outward (kissing)

Question 41

Buccinator action

Answer 41

- pulls the labial commissure laterally, shortening and compressing the cheek - keeps food in the correct position during chewing (assists the muscles of mastication) - forcefully expells air (trumpet muscle) - suction

Question 42

Risorius action

Answer 42

- stretches the lips laterally, widening the mouth - grimace or stretched out grin

Question 43

Levator labii superioris action

Answer 43

Elevates the upper lip in a smile

Question 44

Levator labii superioris alaeque nasi action

Answer 44

Elevates one side of the upper lip towards the nose, dilating the naris (snarling/sneering)

Question 45

Zygomaticus major action

Answer 45

Elevates the labial commissure of the upper lip, pulling it laterally when a person smiles

Question 46

Zygomaticus minor action

Answer 46

Elevates the upper lip, assisting in smiling

Question 47

Levator anguli oris action

Answer 47

Elevates the labial commissure when a person smiles

Question 48

Depressor anguli oris action

Answer 48

Depresses the labial commissure when a person frowns

Question 49

Depressor labii inferioris action

Answer 49

Depresses the lower lip, exposing the mandibular incisors

Question 50

Mentalis action

Answer 50

Raises the chin, wrinkling the skin and protruding the lower lip into a pout

Question 51

Platysma action

Answer 51

- raises the skin of the neck to form noticeable vertical and horizontal ridges and depressions - pulls the labial commissure down (grimace of horror or disgust)