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AIM - The Brain > Temporal/infratemporal fossa > Flashcards

Temporal/infratemporal fossa Flashcards

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1
Q

temporal fossa

A

above zygomatic arch

communicates w/ infratemporal arch thru gap between zygomatic arch and more medial surface of skull

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2
Q

infratemporal fossa

A

wedge-shaped space deep to masseter m. and underlying ramus of mandible

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3
Q

boundaries of temporal fossa

A

superior: superior/inferior temporal lines
anterior: frontal and zygomatic bones
lateral: zygomatic arch
inferior: infratemporal crest
floor: frontal, parietal, temporal, GW sphenoid

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4
Q

contents of temporal fossa

A

temporalis m. and fascia

superficial temporal a. and v.

CNV- auriculotemporal n.
CNVII - temporal and zygomatic br.

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5
Q

superior boundaries of infratemporal fossa

A

infratemporal crest

on surface of GW sphenoid

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6
Q

inferior boundaries of infratemporal fossa

A

medial pterygoid m. (attaches to the mandible)

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7
Q

anterior boundaries of infratemporal fossa

A

posterior aspect of maxilla

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8
Q

posterior boundaries of infratemporal fossa

A

tympanic plate, mastoid, styloid processes

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9
Q

lateral boundaries of infratemporal fossa

A

ramus of mandible

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10
Q

medial boundaries of infratemporal fossa

A

lateral pterygoid plate

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11
Q

contents of the infratemporal fossa

A

temporalis m. (inferior pt)

pterygoid m. (medial/lateral)

maxillary a. (first 2 parts)

pterygoid venous plexus

V3

otic ganglion

chorda tympani

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12
Q

pterygopalatine fossa communicates laterally with…

A

infratemporal fossa

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13
Q

pterygopalatine fossa communicates medially with…

A

nasal canal via SPHENOPALATINE FORAMEN

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14
Q

pterygopalatine fossa communicates anterograde-superiorly with…

A

orbit via inferior orbital fissure

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15
Q

pterygopalatine fossa communicates postero-superiorly with…

A

middle cranial fossa
foramen rotundum
pterygoid canal
pharyngeal canal

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16
Q

pterygopalatine fossa communicates inferiorly with…

A

oral cavity

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17
Q

which arch are mastication m. derived from?

A

arch 1

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18
Q

which m. of mastication is lateral to the infratemporal fossa?

A

masseter

n.: masseteric br. V3, thru mandibular notch

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19
Q

which m. of mastication is particularly susceptible to infection tracking?

A

temporalis m.

tendon insets very low, close to 3rd molar. infection can travel upward

20
Q

origin of deep head of medial pterygoid m.

A

medial surface of LATERAL pterygoid plate and ptrerygoid fossa

21
Q

origin of superficial head of medial pterygoid m.

A

maxilla tuberosity

22
Q

insertion of both heads of medial pterygoid m.

A

pterygoid tuberosity on medial surface of mandibular angle

23
Q

origin of superior head of lateral pterygoid m.

A

GW sphenoid (infratemporal crest)

24
Q

origin of inferior head of lateral pterygoid m.

A

lateral pterygoid plate (lateral surface)

25
Q

insertion of superior head of lateral pterygoid m.

A

TMJ (articular disk)

26
Q

insertion of inferior head of lateral pterygoid m.

A

mandbile (condylar process, pterygoid fovea)

27
Q

3 parts of the maxillary a.

A
  1. mandibular part (bony foramina)
  2. pterygoid part (supplies muscles)
  3. pterygopalatine part (thru pterygopalatine fossa
28
Q

important br. of mandibular part of maxillary a.

A

inferior alveolar a. (teeth, mylohyoid m.)

middle meningeal a. (dura and calvaria via FS)

accessory meningeal a. (dura via FO)

29
Q

pterygoid part of maxillary a. supplies…

A

muscles

30
Q

important br. of pterygopalatine part of maxillary a.

A

infraorbital a.

posterior superior alveolar a.

descending palatine a.

sphenopalatine a.

31
Q

the inferior alveolar a. ends as _____ a.

A

the inferior alveolar a. ends as MENTAL a.

32
Q

Which n. wraps around the middle meningeal a. before ascending upward?

A

auriculotemporal n.

33
Q

anterior and posterior deep temporal a.

A

br. of pterygopalatine part of maxillary a.

supplies temporalis m.

34
Q

infraorbital a.

A

br. of pterygopalatine part of maxillary a.

35
Q

descending palatine a.

A

br. of pterygopalatine part of maxillary a.

supplies roof of mouth

36
Q

sphenopalatine a.

A

terminal br. of maxillary a.

goes thru sphenopalatine foramen

supplies lateral nasal wall, nasal septum, paranasal sinuses

37
Q

which a. provides blood supply to maxillary molars?

A

posterior superior alveolar a.

38
Q

pterygoid venous plexus

A
  • communicates w/ facial v. and cavernous sinus
  • valveless (*infection to teeth)
  • VERY THIN
39
Q

cavernous sinus drains through ______ and _______ to the pterygoid plexus

A

cavernous sinus drains through PETROSAL SINUSES and EMISSARY V. to the pterygoid plexus

40
Q

articular tubercle

A

holds mandible in place

prevents dislocation of jaw

41
Q

ligaments of the TMJ

A

lateral ligament (TMJ ligament)

sphenomandibular ligament

stylomandibular ligament

42
Q

articular surface of the TMJ

A

condyle of mandible
articular tubercle of temporal bone
mandibular fossa

43
Q

lateral ligament of TMJ

A

strengthens TMJ laterally

w/ postglenoid tubercle, presents posterior dislocation of the joint

44
Q

sphenomandibular ligament

A

spine of sphenoid to lingual of mandible

main passive support of mandible

serves as a “swinging hinge” for mandible

45
Q

stylomandibular ligament

A

thickening in fibrous fascia of parotid gland

stabilizes mandible in extreme, protrusive movements

46
Q

motions of TMJ

A

up to 15 degrees abduction –> SWING motion (head of mandible still in mandibular fossa)

past 15 degrees –> head of mandible GLIDES onto articular tubercle

47
Q

two articular cavities (superior/inferior) are separated by ______

A

fibrocartilage disc (articular disc)

attaches to margin of articular area on temporal bone and around neck of mandible

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