Oral function 1: muscles Flashcards Preview

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Flashcards in Oral function 1: muscles Deck (57)
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1

why is the term muscles of mastication misleading

because many other muscles are involved in mastication
the term mandibular muscles is suggested as an alternative

2

what is the origin of the masseter

zygomatic arch

3

what is the insertion of the masseter

lateral surface and angle of mandible

4

what is the action of the masseter

elevates the mandible

5

which patients may have a tender masseter

those who have a clenching habit

6

how do we examine the masseter

place on finger intra orally and the other on the check

7

what is the origin of the temporalis

floor of temporal fossa

8

what is the insertion of the temporalis

coronoid process and anterior border of ramus

9

what is the action of the temporalis

elevates and retracts mandible

10

which patients have a tender temporalis

patients who have a bruxism habit

11

how do you examine the temporalis

palpate its origin by asking the patient to clench the teeth together

12

how is digital palpation performed on the temporalis

it is performed between the superior and inferior temporal lines just above the ear, extending forwards towards the supra-orbital region

13

what is the origin of the lateral pterygoid

from the lateral surface of the lateral pterygoid plate

14

what is the insertion of the lateral pterygoid

anterior border of the condyle and intraarticular disc via two independent heads

15

what is the function of the lateral pterygoid

protrudes and laterally deviates the mandible and the inferior head functions with the mandibular depressors during openings

16

what does the inferior belly of the lateral pterygoid attach to

head of the condyle

17

what does the superior belly of the lateral pterygoid insert into

intra articular disc

18

how do we examine the lateral pterygoid

not accessible to manual palpation
best examined by recording its response to resisted movement
good correlation between the resisted movement test and the muscle being tender to palpitation

19

what is the origin of the deep head of the medial pterygoid

medial surface of the lateral pterygoid plate

20

what is the origin of the superficial head of the medial pterygoid

tuberosity of the maxilla

21

what is the insertion of the medial pterygoid

medial surface of the angle of the mandible

22

what is the action of the medial pterygoid

elevates and assists in protrusion of the mandible

23

why is the medial pterygoid not available for palpation

because of its location inside of the jaw

24

why is there no way of examining the medial pterygoid

does not respond well to resistive movement tests

25

why should bone be contacted when giving ID block

to ensure correct position within the pterygomandibular triangle and not to hit the soft tissues

26

what happens happens if you accidentally hit the medial pterygoid when giving ID block

trismus

27

what are the movements of the TMJ

rotation - initial opening
translation - wider opening

28

what happens in protrusion of the mandible

both condyles leave their fossa and move forward along their aritucular eminences

29

what happens in retrusion of the mandible

both condyles leave the eminences and move back into their respective fossa

30

what is the maximum biting/clenching forces

varies between teeth
maximum between molars is 200-700N