temporal and infratemporal regions and muscles of mastication

Question 1

muscles of mastication are derived

Answer 1

mesoderm of first brachial arch

Question 2

4 roots of otic ganglion

Answer 2

sympathetic, sensory, motor, secretomotor

Question 3

blood supply of infratemporal region

Answer 3

maxillary artery

Question 4

boundaries of temporal fossa

Answer 4

sup: superior temporal lines
inf: zygomatic arch
anteri: frontal and zygomatic bone
posteri: inferior temporal line and supra mastoid crest

Question 5

contents of temporal fossa

Answer 5

temporalis
middle temporal artery
greater temporal nerve supplying temporalis
zygomatioctemporal nerves and vessels
greater temporal artery which is branch of maxillary artery

Question 6

boundaries of infratemporal fossa

Answer 6

rood: infratemporal surface of greater wing of sphenoid
anteriorly: pst surface of body of maxilla
medial: lateral pterygoid plate and pyramidal process of palatine bone
laterally: ramus of mandible

Question 7

contents of infratemporal fossa

Answer 7

1. medial pterygoid plate
2. lateral pterygoid plate
3. manidbular nerve with its branches
4. maxilllary nerve with its posterior superior alveolar branches
5. 1 and 2 parts of maxillary artery with its branches
6. chorda tympani which is a branch of facial nerve
7. posterior superior alveolar artery which is a branch of 3rd part of maxillary artery
8. accompanying veins

Question 8

bones of pterion

Answer 8

frontal, parietal, temporal and greater wing of sphenoid.

Question 9

masseter muscle origin:

Answer 9

1.. superficial layer: anterior 2/3rd of the lower border of zygomatic arch
deep layer: deep surface of zyogomatic arch
3. middle layer: posterior 1/3rd of the lower border of zygomatic arch

Question 10

masseter muscle insertion:

Answer 10

superficial layer: lateral surface lower borrder of the ramus of the mandible
deep layer: rest of the ramus of the mandible
middle layer: central part of the ramus of mandible

Question 11

nerve supply of masseter muscle and its functioon

Answer 11

masseteric nerve whicb is a branch of anterior division of mandibular nerve
- superficila layers cause protrusion
generally elevates the mandible

Question 12

temporalis muscle origin and insertion

Answer 12

origin: a. temporal fossa
b. temporal fascia
insertion: a. margin and deep surface of coronoid process
b. anterior surface of the ramus of mandible

Question 13

temporalis muscle nerve and functin

Answer 13

two deep temporal nerves braches of anterior division of mandibular nerve
elevates, side to side grinding
and posterior fibers (horizontal) cause protrusion

Question 14

lateral pterygoid origin

Answer 14

upper head (small): infratemporal surface and crest of the greater wing of sphenoid lower head (large): lateral surface of lateral pterygoid plate

Question 15

lateral pterygoid insertion

Answer 15

upper head :pterygoid fovea on the ant surface of the neck of the mandible
lower head: anterior margin of the articular disk and capsule of tmj

Question 16

lateral pterygoid nerve and function

Answer 16

branch of anter division of mandibular nerve
protudes the mandible
depresses the mandible
and right lateral petrygoid turns the chin to the left

Question 17

lateral pterygoid origin

Answer 17

superficial head: tuberosity of mandible with the adjoining bone
deep head: medial suraface of the lateral pterygoid plate

Question 18

lateral pterygoid insertion

nerve and function

Answer 18

roughened area on the ant surface of the angle of the mandible below mandibular foramen
nerve to medial pterygoid divinsing of main trunk of mandibular nerve
elevate the mandible
protrudes the mandible
right medial and lateral pterygoid turns to move the chin to the left

Question 19

relations of lateral pterygoid

superficial

Answer 19

masseter
ramus of the mandible
tendon of the temporalis
maxillary artery

Question 20

relations of lateral pterygoid

deep

Answer 20

mandibular nerve
middle meningeal artery
sphenomandibular ligament
deep head of medial petrygoid

Question 21

relations of lateral pterygoid structure emerging from upper and lower border

Answer 21

upper: deep temporal nerve
masseteic nerve 
lower: labial nerve and artery 
inferior alveolar nerve 
middle meningeal artery 
acessory meningeal artery

Question 22

relations of lateral pterygoid

contents between the two heads

Answer 22

maxillary artery enters the gap

and buccal branches of mandibular nerve

Question 23

relations of medial ptergoid

superficial

Answer 23

lateral pterygoid plate
inferior alevolar nerve
lingual nerve

Question 24

relations of medial ptergoid

deep

Answer 24

tensor veli palitini
styloglossus
stylopharangeus
superior constrictor of pharynx