Lecture 17

Question 1

What is the function of the buccinator during mastication?

Answer 1

pull back the angle of the mouth and to flatten the cheek area. helps hold food in mouth and assists the muscles of mastication.

Question 2

What are the articulations of the TMJ joint?

Answer 2

• between head of mandible and mandibular fossa of temporal bone
• does anterior gliding and hinge like rotation

Question 3

What are the three ligaments associated with the TMJ?

Answer 3

• temporomandibular ligament
• stylomandibular ligament
• spehnomandibular ligament

Question 4

Muscles that operate the TMJ

Answer 4

masseter
temporalis
medial pterygoid
lateral pterygoid

Question 5

masseter origin

Answer 5

inferior margin and deep surface of zygomatic bone

Question 6

masseter insertion

Answer 6

lateral surface of mandibular ramus and coronoid process

Question 7

masseter action

Answer 7

elevates and protracts the mandible

Question 8

masseter innervation

Answer 8

mandibular branch of CN V

Question 9

temporalis origin

Answer 9

floor of temporal fossa and temporal fascia

Question 10

temporalis insertion

Answer 10

coronoid process and anterior border of mandibular ramus

Question 11

temporalis action

Answer 11

elevates and retracts the mandible

Question 12

temporalis innervation

Answer 12

mandibular branch of CN V

Question 13

lateral pterygoid origin

Answer 13

lateral pterygoid plate and greater wing of sphenoid

Question 14

lateral pterygoid insertion

Answer 14

front of neck of mandible, articular disc and TMJ

Question 15

lateral pterygoid action

Answer 15

protracts mandible, depresses chin (bilateral) and grinding (unilateral)

Question 16

lateral pterygoid innervation

Answer 16

mandibular branch of CN V

Question 17

medial pterygoid origin

Answer 17

lateral pterygoid plate and maxilla

Question 18

medial pterygoid insertion

Answer 18

medial surface of mandible near angle

Question 19

medial pterygoid action

Answer 19

protracts, elevates, and grinding

Question 20

medial pterygoid innervation

Answer 20

mandibular branch of CN V

Question 21

anterior boundary of infra temporal fossa

Answer 21

maxilla

Question 22

superior boundary of infra temporal fossa

Answer 22

greater wing of sphenoid

Question 23

medial boundary infra temporal fossa

Answer 23

lateral pterygoid plate

Question 24

lateral boundary of infra temporal fossa

Answer 24

coronoid process and ramus of mandible

Question 25

inferior boundary of infra temporal fossa

Answer 25

continuous with neck

Question 26

posterior boundary of infra temporal fossa

Answer 26

TMJ and styloid process

Question 27

Contents of infra temporal fossa

Answer 27

``` Mandibular nerve Maxillary artery Medial and lateral pterygoid muscles Lower part of temporalis muscle Chorda tympani nerve Otic ganglion ```

Question 28

What are the branches of the first part of the maxillary artery?

Answer 28

``` deep auricular anterior tympanic middle meningeal accessory meningeal inferior alveolar ```

Question 29

What are the branches of the second part of the maxillary artery?

Answer 29

buccal artery

Question 30

What are the branches of the third part of the maxillary artery?

Answer 30

``` posterior superior alveolar infraorbital descending palatine artery to pterygoid canal pharyngeal artery sphenopalatine artery ```