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CNS Anatomy > Temporal & Infratemporal Fossae > Flashcards

Temporal & Infratemporal Fossae Flashcards

1
Q

The temporal fossa contains….&….

A

Temporalis muscle & temporal fascia

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2
Q

Describe bounds of infratemporal fossa

A

Lat, ramus of mandible, med, lateral pterygoid plate, ant post surface of maxilla, post styloid process, sup, greater wing of sphenoid.

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3
Q

The infratemporal fossa communicates with middle cranial fossa through ….&…., and with orbit through…, and with pterygopalatine fossa through……

A

Foramen ovale & spinsum
Inferior orbital fissure
Pterygo-maxillary fissure

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4
Q

Mention superficial contents of infratemporal fossa

A

Lat & medial pterygoid muscles
Branches of mandibular nerve
Maxillary artery
Pterygoid venous plexus

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5
Q

Enumerate deep contents of infratemporal fossa

A
  1. Trunk of mandibular nerve & otic ganglion
  2. Tensor palate muscle
  3. Middle meningeal & accessory meningeal arts
  4. Chorda tympani nerve
  5. Spheno-mandibular ligament
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6
Q

Muscles of mastication develop from……

A

1st pharyngeal arch

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7
Q

Describe origin, instert. & nerve supply of temporalis

A

O, floor of temporal fossa and temporal fascia.
I, all aspects of the coronoid process ex lateral
N, two deep temporal nerves from ant division of mandibular nerve

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8
Q

Describe origin, instert. & nerve supply of masseter

A

O, superficial part: ant 2/3 of lower border of zygomatic arch. Deep from post third of lower and inner zygomatic arch
I, lateral surface of ramus of mandible
S, masseteric branch from ant division of mandibular

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9
Q

Describe origin, instert. & nerve supply of lateral pterygoid

A

O, upper head, infratemporal crest and surface of greater wing of sphenoid
Lower head, lateral surface of lateral pterygoid plate
I, fovea in front of the neck of mandible & capsule and articular disc of TMJ
S, pterygoid branch from ant division of mandibular nerve

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10
Q

Describe origin, instert. & nerve supply of medial pterygoid

A

O, superficial head from tuberosity of maxilla. Deep head from medial surface of lateral ptrlerygoid plate
I, medial surface of angle of mandible
S, branch from mandibilar trunk.

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11
Q

Brief the actions of temporalis & masseter

A

Both elevate the mandible (antigravity muscles), temporalis retracts the mandible while masseter protrudes it.

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12
Q

Brief the actions of lat & med pterygoid muscles

A

Lat: depresses mandible to open mouth & protrudes mandible with help of med ptrygoid.
Med: elevates mandible
When both act together produce side-to-side chewing movements

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13
Q

Mention the structures passing between 2 heads of lateral pterygoid

A

Buccal nerve
Maxillary artery

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14
Q

Lateral surface of lateral pterygoid is related to:

A
  1. Ramus of mandible
  2. Superficial head of medial ptergoid & tendon of temporalis
  3. Maxillary a. & pterygoid venous plexus
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15
Q

Medial surface of lateral pterygoid is related to:

A

M, deep head of medial pterygoid & tensor palati
A, middle meningeal & maxillary arteries
N, mandibukar nerve trunk, otic ganglion & chorda tympani
L, spheno-mandibular ligament

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16
Q

Type of joint of TMJ

A

Synovial-condylar

17
Q

The upper surface of articular dics of cartilage is…..to fit……, while lower is…..to fit……

A

Concavo-convex, mandibular fossa & articular eminence
Concave, mandibular head

18
Q

Temopro-mandibular ligament lies…..to joint capsule, limits…..movement & protects……

A

Lateral
Posterior
External auditory meatus

19
Q

Stylo-mandibukar ligament lies ….to joint capsule, it separates ….from…..

A

Posterior
Parotid/submandibular gland

20
Q

Spheno-mandibular ligament is attached to…..of mandible, lies….to joint capsule

A

Lingula of mandibular foramen
Medial

21
Q

The depression of the mandible is AIDED by…..

A

Geniohyoid, digastric & mylohyoid

22
Q

Describe blood & nerve supply of TMJ

A

Superficial temporal & maxillary arteries
Auriculotemporal & masseteric nerves

23
Q

GR: Dislocation of TMJ occurs mostly in ant direction

A
  1. TMJ lies just ant to external auditory meatus
  2. The lateral temporomandibular ligament prevents backward dislocation of joint protecting external auditory meatus
24
Q

Mention relations of mandibular trunk in infratemporal fossa

A

Med: tensor palati & otic ganglion
Lat: lateral pterygoid
Post: middle meningeal art

25
Q

Mention branches of main mandibukar trunk

A

Nervus spinosus & n. to medial pterygoid (passes otic ganglion without relay to supply tensor palati & tensor tympani.

26
Q

Mention branches of post division of mandibular n

A

The auriculotemporal n
Lingual nerve
Inferior alveolar n

27
Q

The auriculotemporal passes berween…..

A

Spheno-mandibular ligament
Neck of mandible

28
Q

List branches of auriculotemporal nerve

A

Auricular, temporal, glandular & articular

29
Q

The lingual nerve is joined by……, it passes between………to enter mouth. In the mouth, it crosses………muscles, it hangs….

A

Chorda tympani
Mandible & medial pterygoid
Styloglossus, hyoglossus & genioglossus
Submandibular ganglion

30
Q

Describe distrubution of lingual nerve

A

Ganglionic branches to submand ganglion
Taste sensation from ant 2/3 of tongue & postganglionic parasympathetic submand & sublingual glands via chorda tympani
Sensory branches to ant 2/3, floor of mouth & lingual aspect of gingiva

31
Q

Inferior alveolar nerve ends as…..

A

Mental nerve

32
Q

List branches of inferior alveolar nerve

A

Mylohyoid n, mental nerve, incisive nerve

33
Q

The maxillary nerve passes through…..

A

Foramen rotundum

34
Q

Describe extracranial course of maxillary nerve

A

Enters ptergopalatine fossa then passes in pterygomaxillary fissure to enter infratemporal fossa, then enters infratemporal fissure to become infraorbital nerve & passes in its groove canal & foramen to emerge on face.

35
Q

List branches of maxillary nerve (not infra-orbital)

A

In cranial cavity: meningeal nerve to dura of middle cranial fossa
In the pterygopalatine fossa: two ganglion branches to to pterygopalatine ganglion, zygomatic branch (zygomatico-facial & zygomatico-temporal), posterior superior alveolar n.

36
Q

Describe role of zygomatico-facial nerve

A

Communicates with lacrimal nerve carrying with it parasympathetic supply to lacrimal gland
Supply non-hairy skin of temple

37
Q

Describe supply of posterior superior alveolar n.

A

Mucosa of maxillary air sinus & upper 3 molars

38
Q

List branches of infra-orbital nerve

A

Middle superior alveolar nerve, anterior superior alveolar nerve, palpebral (to lower lid), nasal (to ala of nose) & labial (to upper lip)

39
Q

Middle sup alveolar n supplies……while ant s.a.n. supplies……

A

Upper 2 premolar teeth & gums
Upper 2 incisors & canine teeth

CNS Anatomy (19 decks)

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