muscles of mastication

Question 1

where do the mastication movements occur

Answer 1

the tmj joint

Question 2

purpose of chewing

Answer 2

speeds up digestion
stimulates saliva

Question 3

how does the tmj open for wide and small openings

Answer 3

wide - hinge and slide(condyle slides)
small opening- just hinges

Question 4

where is the articular eminence found

Answer 4

above the condyle and coronoid process

Question 5

what is a raphe

Answer 5

a union between 2 muscles

Question 6

the 3 complex groups involved in mastication

Answer 6

skull- mandible
mandible- hyoid
hyoid stabilisers

Question 7

1. skull- mandible

Answer 7

masseter, temporalis, medial pterygoid, lateral pterygoid

Question 8

2. mandible - hyoid

Answer 8

gleniohyoid, mylohyoid, anterior belly digastric

Question 9

3. hyoid stabilisers

Answer 9

• infrahyoids- (omohyoid, sternohyoid, thyrohyoid)
• posterior belly
• stylohyoids

Question 10

masseter innervation and action

Answer 10

cnv3
closing (elevation)
2 parts- deep and superficial

Question 11

temporalis innervation and action

Answer 11

cnv3
closing and retrusion

Question 12

medial pterygoid innervation and action

Answer 12

cnv3
closing, assists protrusion and lateral.
important in la

Question 13

what muscle is important in LA

Answer 13

medial pterygoid

Question 14

lateral pterygoid innervation and action

Answer 14

cnv3
action is complex- supports wide opening by bringing the condyle forward into the articular eminence
2 parts -
lower head-pulls forward
upper head- active during retrusion and closing

Question 15

lateral pterygoid lower head and upper head

Answer 15

lower - pulls forward
upper- active during retrusion and closing

Question 16

gleniohyoid innervation and action

Answer 16

c1 and cn12
hyoid fixed- jaw open ad retrusion
hyoid not fixed - raise and forward hyoid

Question 17

mylohyoid innervation and action

Answer 17

cnv3
hyoid fixed- jaw open
hyoid not fixed- raise hyoid

Question 18

anterior belly digastric

Answer 18

cnv3
hyoid fixed- jaw open
hyoid not fixed- raise hyoid

Question 19

position of mylohyoid

Answer 19

mylohyoid above gleniohyoid posterior belly behind and anterior belly under

Question 20

infrahyoids

Answer 20

sternohyoid, omohyoid, thyrohyoid
if these are in contact the hyoid is fixed

Question 21

what other two facial expression muscles are involved

Answer 21

buccinator
orbicularis oris

Question 22

force of teeth
force of no teeth

Answer 22

150n - 15kg
5n- 5kg

Question 23

how many muscles are involved in the mastication process

Answer 23

24, 5 stabilisers