Lab 3: Origins, Insertions, Actions

Question 1

what is the origin of the buccinator?

Answer 1

-maxilla
-mandible
-sphenoid

Question 2

what is the insertion of the buccinator?

Answer 2

-orbicularius oris

Question 3

what is the action of the buccinator?

Answer 3

-flattens cheek (presses it to teeth+lips)
-assists in chewing (keeps food between teeth)
-blowing, sucking, whistling

Question 4

what is the origin of the frontal belly?

Answer 4

-epicranial aponeurosis

Question 5

what is the insertion of the frontal belly?

Answer 5

-skin superior to the eyes and nose

Question 6

what is the action of the frontal belly?

Answer 6

-raises eyebrows
-wrinkles forehead (horizontally)
-draws scalp anteriorly

Question 7

what is the origin of the occipital belly?

Answer 7

-occipital bone
-mastoid process of the temporal bone

Question 8

what is the insertion of the occipital belly?

Answer 8

-epicranial aponeurosis

Question 9

what is the action of the occipital belly?

Answer 9

-draws scalp posteriorly

Question 10

what is the origin of the masseter

Answer 10

-maxilla
-zygomatic arch

Question 11

what is the insertion of the masseter?

Answer 11

-mandible

Question 12

-what is the action of the masseter?

Answer 12

-elevates the mandible (closes mouth)

Question 13

what is the origin of the orbicularis oculi?

Answer 13

-frontal bone
-maxilla

Question 14

what is the insertion of the orbicularis oculi?

Answer 14

-eyelid

Question 15

what is the action of the orbicularis oculi?

Answer 15

-closes eye

Question 16

what is the origin of the orbicularis oris?

Answer 16

-maxilla
-mandible

Question 17

what is the insertion of the orbicularis oris?

Answer 17

-lips

Question 18

what is the action of the orbicularis oris?

Answer 18

-closes and protrudes lips (kissing)
-shapes lips during speech

Question 19

what is the origin of the risorius?

Answer 19

-fascia over the salivary gland

Question 20

what is the insertion of the risorius?

Answer 20

-skin at the angle of the mouth

Question 21

what is the action of the risorius?

Answer 21

draws the angle of the mouth laterally (grimacing)

Question 22

what is the origin of the sternocleidomastoid?

Answer 22

-clavicle
-sternum

Question 23

what is the insertion of the sternocleidomastoid?

Answer 23

-mastoid process on the temporal bone

Question 24

what is the action of the sternocleidomastoid?

Answer 24

-elevates, flexes, and extends the head and neck

Question 25

what is the origin of the temporalis?

Answer 25

-temporal bone

Question 26

what is the insertion of the temporalis?

Answer 26

-coronoid process of the mandible

Question 27

what is the action of the temporalis?

Answer 27

-elevate and retract the mandible

Question 28

what is the origin of the trapezius?

Answer 28

-occipital bone

Question 29

what is the insertion of the trapezius?

Answer 29

-clavicle
-scapula

Question 30

what is the action of the trapezius?

Answer 30

-rotates, adducts, depresses, and stabilizes the scapula

Question 31

what is the origin of the zygomaticus major?

Answer 31

-zygomatic bone

Question 32

what is the insertion of the zygomaticus major?

Answer 32

-skin at the angle of the mouth
-orbicularis oris

Question 33

what is the action of the zygomaticus major?

Answer 33

-draws the angle of the mouth superiorly + laterally (smiling)

Question 34

what do the frontal belly and occipital belly create?

Answer 34

-occipitofrontalis