Temporal And Infratemporal Fossae

Question 1

What is the temporal fossa?

Answer 1

The temporal fossa is a shallow depression on the side of the skull.

Question 2

What are the boundaries of the temporal fossa?

Answer 2

Superior: superior temporal line
Inferior: Zymgomatic Arch
Floor: Frontal , Parietal, Temporal,Sphenoid bones
Roof: Skin and Temporal Fascia

Question 3

What are the contents of the temporal fossa?

Answer 3

Temporalis muscle
Deep temporal nerves and vessels
Superficial temporal vessels
Auriculotemporal nerve]

Question 4

What artery is located in the Pterion area?

Answer 4

Middle meningeal artery

Question 5

What is the infratemporal fossa?

Answer 5

Area which lie below the skull,medial to the ramus and posterior to maxilla

Question 6

What are the boundaries of the infratemporal fossa

Answer 6

Superior- greater wing of sphenoid bone
Inferior- open
Medial- lateral pterygoid plate
Anterior- posterior surface of maxilla
Posterior- tympanic plate,mastoid and styloid process
Lateral-ramus

Question 7

What are the four muscles of mastication?

Answer 7

Masseter
Temporalis
Lateral Pterygoid
Medial Pterygoid

Question 8

What do the muscles of mastication do?

Answer 8

They move they mandible during speech and mastication.

Question 9

What are the muscles of mastication developed from?

Answer 9

They are developed from the mesoderm of the 1st pharyngeal arch

Question 10

What nerve are the muscles of mastication supplied by?

Answer 10

They are supplied by branches of the mandibular nerve

Question 11

What is the origin of the masseter?

Answer 11

Lower border and deep surface of the zygomatic arch

Question 12

What is the insertion of the masseter?

Answer 12

Outer surface of ramus and angle of mandible

Question 13

Nerve supply of the masseter?

Answer 13

Masseteric nerve of from mandibular nerve

Question 14

What is the action of the masseter?

Answer 14

The masseter elevates the mandible,closing the jaw.

Question 15

What is the origin of the temporalis muscle?

Answer 15

The origin of the temporalis muscle is Floor of temporal fossa and deep surface of temporal fascia.

Question 16

What is the insertion of the temporalis muscle?

Answer 16

The insertion of the temporalis muscle is coronoid process of the mandible and anterior border of the ramus of mandible

Question 17

What is the nerve supply of the temporalis muscle?

Answer 17

Deep temporal nerves from mandibular nerve

Question 18

What are the actions of the temporalis muscle?

Answer 18

Elevates the jaw,closing the mandible.
Posterior fibers retract the protruded mandible

Question 19

What are the origins of the lateral pterygoid?

Answer 19

Upper head- infra-temporal surface greater wing of sphenoid bone
Lower head- lateral surface of lateral pterygoid plate.

Question 20

What are the insertions of the lateral pterygoid?

Answer 20

Both heads join together and are inserted into the pterygoid fovea of the neck of mandible and the articulation disk of tempromandibular joint.

Question 21

What is the nerve supply to the lateral pterygoid muscle?

Answer 21

Mandibular nerve

Question 22

What are the actions of the lateral pterygoid?

Answer 22

Depresses the mandible
Lateral+medial pterygoid muscles protrude the mandible.
Side to side grinding movements

Question 23

What is the origin of the medial pterygoid?

Answer 23

Superficial head- tuberosity of maxilla
Deep head- medial surface lateral pterygoid plate

Question 24

What is the insertion of the medial pterygoid?

Answer 24

Both heads join together and are inserted into inner surface of ramus and angle of mandible

Question 25

What is the nerve supply of the medial pterygoid?

Answer 25

Mandibular nerve

Question 26

What are the actions of the medial pterygoid?

Answer 26

Elevates the mandible
Lateral and medial pterygoid muscles protrude the mandible
Lateral and medial pterygoid muscles produce side to side grinding movements