Muscles Of Mastication

Front 1

what are the four muscles of mastication?

Back 1

masseter, temporal

medial pterygoid, lateral pterygoid

Front 2

what are the four muscles of mastication attached by?

Back 2

mandible

Front 3

what is the most powerful muscle of mastication?

Back 3

masseter

Front 4

what is the masseter muscle shape?

Back 4

quadrilateral

Front 5

what happens to the mandible when the masseter muscle is contracted?

Back 5

it elevates

Front 6

what is the masseter muscle's action?

Back 6

closing of the mouth OR elevation of mandible

Front 7

how many origins does the masseter muscle have?

Back 7

2

Front 8

what is the origin of the masseter muscle?

Back 8

superficial head and deep head

Front 9

where is the origin of the masseter muscle?

Back 9

on the zygomatic arch

Front 10

where does the massetee muscle insert (masseter muscle insertion is ______)

Back 10

fibers of the superficial head that run down + back to insert into the angle of mandible

Front 11

What is the origin of the temporal muscle?

Back 11

temporal fossa

Front 12

what is the action of the temporal muscle?

Back 12

when muscle is contracted, the mandible is elevated.

Front 13

what is the insertion of the temporal muscle?

Back 13

cornoid process

Front 14

What is the origin for the medial pterygoid muscle

Back 14

1. greater wing of the sphenoid bone/pyrmaidal process of the palatine bone

2. maxillary tuberosity

Front 15

what is the insertion of the medial pterygoid muscle

Back 15

angle of the mandible on the mesial side

Front 16

what is the action of the medial pterygoid muscle?

Back 16

muscle contraction elevates the mandible and closes the mouth

Front 17

what is the origin of the lateral pterygoid muscle

Back 17

Inferior head = lateral surface of lateral pterygoid plate of the sphenoid bone

Superior head = infratemporal crest of greater wing of sphenoid bone

Front 18

what is responsible for mandibular protrusion?

Back 18

lateral pterygoid muscles

Front 19

what is responsible for mandibular retrusion?

Back 19

posterior fibers of temporal muscle and diagstric muscle

Front 20

what is responsible for lateral excursion of the mandible?

Back 20

one lateral pterygoid muscle acting on its own

Front 21

what is responsible for elevation of the mandible

Back 21

medial pterygoid, masseter, temporal muscles

Front 22

what is the action of the lateral pterygoid muscle

Back 22

protrude and depress mandible & lateral excursion to opposite side of contacted muscle

Front 23

what is responsible for depression of the mandible (opening of mouth)

Back 23

inferior head of lateral pterygoid muscles, hyoid muscles

Front 24

what moves up and down during swallowing and phonation?

Back 24

larynx

Front 25

________ ________ is pulled up by contraction of suprahyoid muscles

Back 25

hyoid bone

Front 26

what gets elevated when thyrohyoid muscle contracts?

Back 26

thyroid cartilage of larynx

Front 27

what is the sternocleidomastoid muscle involved in?

Back 27

tilting and rotating head

Front 28

what is the origin of sternocleidomastoid

Back 28

upper border sternum and medial third of clavice

Front 29

what is sternocleidomastoid's insertion?

Back 29

mastoid process of temporal bone

Front 30

what is sternocleidomastoid innervation?

Back 30

cranial nerve

Front 31

sternocleidomastoid blood supply

Back 31

cartoid artery

Front 32

what is trapezius muscle origin?

Back 32

external occipital protuberance on occipital bone and superior nuchal lines,

spinous processes of cervical and thoracic vertebrae

Front 33

what is trapezius muscle action?

Back 33

shrugging shoulders

Front 34

what is trapezius muscle insertion

Back 34

acromin process

spine of scapula

Front 35

when the ________ muscle is in spasm, it causes TMJ pain

Back 35

trapezius