Temporal fossa

Question 1

boundaries : 1. above

Answer 1

temporal line of frontal and parietal bone

Question 2

boundaries : 2. below

Answer 2

upper border of zygomatic bone

Question 3

boundaries : 3. floor

Answer 3

‘H’-shaped suture where the 4 bones meet (pterion)

Question 4

tmj type

Answer 4

synovial joint

Question 5

tmj articular surface

Answer 5

condylar proceess of mandible and mandibular fossa of temporal bone

Question 6

tmj ligament

Answer 6

lateral temporomandibular / sphenomandibular/

stylomandibular ligaments

Question 7

tmj nerve supply

Answer 7

Auriculotemporal and mesenteric branch of mandibular

nerve

Question 8

tmj clinical signnificance

Answer 8

1. lat. TM lig prevents posterior dislocation of the mandible so as not to
   fracture the tympanic plate when a severe blow falls on the chin.
2. If the disc is partially detached from the capsule, its movements
   become noisy and produce audible click during movement of the joint

Question 9

muscle of mastication

Answer 9

masseter, temporalis, medial pterygoid, lateral pterygoid

Question 10

masseter muscle origin

Answer 10

zygomatic arch and maxillary process of zygomatic bone

Question 11

masseter muscle insertion

Answer 11

Lateral surface of ramus of

mandible

Question 12

contents of temporal fossa

Answer 12

1. temporalis muscle
2. temporal fascia
3. zygomaticotemporal branch of maxillar nerve
4. deep temporal artery- branch of maxillary artery
5. deep temporal nerve - branch of mandibular nerve
6. middle temporal artery - superficial temporal artery

Question 13

boundaries of infratemporal fossa roof

Answer 13

inferior surface of of greater wing of sphenoid and temporal bone. it also contains foramen spinosum.

Question 14

boundaries of infratemporal fossa lateral wall

Answer 14

medial surface of ramus of mandible

Question 15

boundaries of infratemporal fossa medial wall

Answer 15

anteriorly-lateral plate of pterygoid process and more posteriorly by pharynx and muscle of soft palate

Question 16

contents of infratemporal fossa

Answer 16

• Sphenomandibular ligament.
• Medial & lateral pterygoid muscle.
• Mandibular nerve
• Maxillary artery.
• Branches of facial nerve.
• glossopharyngeal nerve
• Pterygoid plexus.

Question 17

Branches of Mandibular nerve

Answer 17

Mandibular nerve enters the infratemporal
fossa via foramen ovale & gives 2 branches
before dividing into ant & post trunk

Question 18

2 branches of Mandibular nerve

Answer 18

Meningeal nerve & nerve to medial pterygoid.

Question 19

Anterior trunk branches:

Answer 19

Sensory : buccal

Motor : masseteric , deep temporal, nerve to lateral pterygoid

Question 20

Posterior trunk branches:

Answer 20

sensory : auriculotemporal nerve, lingual nerve, inferior alveolar nerve
motor : nerve to mylohyoid (branch of inferior alveolar nerve)

Question 21

NErve supply of parotid gland

Answer 21

sensory : auriculotemporal nerve

preganglionic parasympathetic fibers to otic ganglion come from : glossopharyngeal nerve

Question 22

mandibular division of trigerminal nerve

Answer 22

mandibular nerve leaves the skull through foramen ovale.

Question 23

mandibular division, of trigerminal nerve. motor fibres innervate

Answer 23

• muscle of mastication including
• temporalis,
• masseter,
• medial & lateral pterygoid,
• tensor tympani,
• tensor veli palatini,
• anterior belly of digastric &
• mylohyoid muscle.

Question 24

Mandibular nerve also receives

sensory branches from

Answer 24

• skin of lower face,
• cheek,
• lower lip,
• ear,
• external acoustic meatus & temporal region, anterior 2/3 of tongue,
• teeth of lower jaw,
• mastoid air cells,
• mucous membrane of cheek,
• mandible, and
• dura in middle cranial fossa.

Question 25

Maxillary artery

Answer 25

• Maxillary artery—branch of External carotid

artery.

Question 26

maxillary artery is the major source of blood supply to

Answer 26

• Maxillary artery—branch of External carotid

artery.

Question 27

branches of maxilla artery got 3 branches

Answer 27

1st part : middle meningeal artery, inferior alveolar artery, small branches like ; deep auricular, ant tympanic and accesory
2nd : deep temporal , masseteric, buccal, pterygoid branch
3rd : pterygopalatine fossa

Question 28

Pterygoid plexus

Answer 28

These veins drain from
• nasal cavity,
• oral cavity,
• all teeth,
• muscles of infratemporal fossa,
• paranasal sinuses & nasopharynx.
• In addition inferior ophthalmic vein from orbit drain through inferior
orbital fissure into pterygoid plexus.