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Gross Anatomy Unit 3 > 17: Infratemporal Fossa > Flashcards

17: Infratemporal Fossa Flashcards

1
Q

lateral boundary of the infratemporal fossa

A

ramus of the mandible and zygomatic arch

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2
Q

medial boundary of the infratemporal fossa

A

lateral pterygoid plate of the sphenoid bone

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3
Q

anterior boundary of the infratemporal fossa

A

posterior surface of the maxilla

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4
Q

posterior boundary of the i.f.

A

styloid process, external auditory meatus

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5
Q

superior boundary of the i.f.

A

interior surface of greater wing of sphenoid

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6
Q

inferior boundary of the i.f.

A

superior border of the body of the mandible

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7
Q

foramina in the infratemporal fossa

A 
foramen ovale
foramen spinosum
posterior superior alveolar canal
mandibular canal
pterygomaxillary fissure
petrotympanic fissure
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8
Q

structures that pass through the foramen ovale

A 
"OVALE"
otic ganglion
V3
accessory meningeal a.
lesser petrosal n. (branch of CN 9 glossopharyngeal)
emissary vv.

(located in greater wing of sphenoid bone)

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9
Q

pass through foramen spinosum

A

middle meningeal a.
middle meningeal v.
meningeal branch of the mandibular n.

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10
Q

pass through posterior superior alveolar canal

A

?? look up

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11
Q

pass through mandibular canals

A

inferior alveolar n.
inferior alveolar a.
inferior alveolar v.

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12
Q

pterygomaxillary fissure transmits

A

terminal end of maxillary a.
connects infratemporal fossa with pterygopalatine fossa - the “door”
***posterior superior alveolar nerve travels from the pterygopalatine fossa to the infratemporal fossa

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13
Q

petrotympanic fissure transmits

A

anterior tympanic branch of the maxillary a.

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14
Q

muscular contents of the infratemporal fossa

A

medial pterygoid m.
lateral pterygoid m.
part of temporalis m.
part of masseter m.

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15
Q

vascular contents of the infratemporal fossa

A

maxillary a. with 2/3 of branches
pterygoid plexus of veins
deep facial lymphatics

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16
Q

neural contents of the infratemporal fossa

A

V3 and branches
chorda tympani nerve from CN 7 facial n.
otic ganglion

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17
Q

ligaments of the infratemporal fossa

A

sphenomandibular ligament

stylomandibular ligament

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18
Q

muscles of mastication

A

lateral pterygoid m.
medial pterygoid m.
temporalis m.
masseter m.

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19
Q

lateral pterygoid m.: origin

A

(fibers running horizontally/into the pockets)

upper/superior head: infratemporal ridge and infratemporal surface of the greater wing of the sphenoid

lower/inferior head: lateral surface of the lateral pterygoid plate of the sphenoid bone

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20
Q

lateral pterygoid m.: insertion

A

pterygoid fovea (on the neck of the mandible) and articular disc of the TMJ

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21
Q

lateral pterygoid m.: innervation

A

lateral pterygoid n. branch of V3

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22
Q

lateral pterygoid m.: action

A

acting in unison/bilaterally: depression of the mandible, protrusion of the mandible (down and forward)

acting unilaterally: lateral deviation of mandible to the contralateral side

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23
Q

medial pterygoid m.: origin

A

(fibers running vertically)

superficial head: maxillary tuberosity and pyramidal process of the palatine bone

deep head: medial surface of lateral pterygoid plate of the sphenoid and pyramidal process of the palatine bone

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24
Q

medial pterygoid m.: insertion

A

medial surface of the ramus and angle of the mandible posterior to the mylohyoid groove

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25
Q

medial pterygoid m.: innervation

A

medial pterygoid n. branch of V3

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26
Q

medial pterygoid m.: action

A

elevates the mandible, assists in protrusion

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27
Q

temporalis m. origin

A

floor of the temporal fossa (includes frontal, parietal, temporal, and greater wing of sphenoid bones)

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28
Q

temporalis m. insertion

A

medial surface, apex, and anterior border of the coronoid process; anterior border of the mandibular ramus

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29
Q

temporalis m. innervation

A

anterior and posterior deep temporal nn. branches of V3

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30
Q

temporalis m. action

A

elevates the mandible, posterior fibers retrude the mandible (bring it back)

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31
Q

masseter m. origin

A

both heads: inferior border of the zygomatic arch

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32
Q

masseter m. insertion

A

lateral surface of the ramus and angle of the mandible; anterolateral aspect of the coronoid process

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33
Q

masseter m. innervation

A

masseteric n. branch o V3

34
Q

masseter m. action

A

elevates the mandible; superficial head - protrusion; deep head - retrusion

35
Q

maxillary a. basics

A

terminal branch of external carotid a.
3 portions: 2 (mandibular and pterygoid portions) in infratemporal fossa, 1 (pterygopalatine portion) in pterygopalatine fossa

36
Q

mandibular portion of maxillary a. location

A

runs b/w the neck of the mandible and sphenomandibular ligament, on the inferior border of the lateral pterygoid m.

37
Q

mandibular portion of maxillary a. branches

A

DAM I A

deep auricular a.
anterior tympanic a.
middle meningeal a.
inferior alveolar a. (mylohyoid a., mental a.)
accessory meningeal a.
38
Q

deep auricular a. supplies

A

lateral surface of the tympanic membrane, lining of external auditory meatus

39
Q

anterior tympanic a. supplies

A

medial surface of tympanic membrane (after traversing the petrotympanic fissure)

40
Q

middle meningeal a. supplies

A

dura and bones of skull; enters skull via foramen spinosum

41
Q

accessory meningeal a. supplies

A

trigeminal ganglion and dura; enters skull via foramen ovale

42
Q

inferior alveolar a.

A

gives rise to a mylohyoid a. branch before entering the mandibular canal to supply the mandibular teeth

mental a. branch supplies the chin

43
Q

2nd section of maxillary artery includes

A

aka the pterygoid portion

MDPB

masseteric a.
deep temporal aa. (anterior and posterior)
pterygoid branches
buccal a.

44
Q

2nd section of maxillary artery passes

A

medial to the mandibular ramus
either deep to superficial to the lateral pterygoid muscle
enters the pterygopalatine fossa via pterygomaxillary fissure

*predominantly supply muscles

45
Q

masseteric a. supplies

A

the masseter muscle (traverses the mandibular notch)

46
Q

deep temporal aa. supply

A

temporalis m.

47
Q

pterygoid branches supply

A

medial and lateral pterygoid mm.

48
Q

buccal a. supplies

A

buccinator m. and mucous membrane of oral vestibule

49
Q

3rd section of maxillary artery courses

A

within the pterygopalatine fosa, just inferior to the maxillary division of the trigeminal nerve (V2)

50
Q

3rd section of maxillary a. branches

A 
posterior superior alveolar a.
infraorbital a.
artery of pterygoid canal
pharyngeal a.
descending palatine a.
sphenopalatine a.
51
Q

pterygoid plexus of veins consists of

A 
pterygoid vv. 
masseteric v.
deep temporal vv.
buccal v.
alveolar vv.
meningeal vv.
palatine vv.
sphenopalatine v.
52
Q

pterygoid plexus of veins drains into/communicates with

A

drains into: maxillary v. (tributary of retromandibular v.)

communicates with: opthalmic veins, facial vein, and cavernous sinus

53
Q

mandibular division of trigeminal n. (V3) fibers

A

sensory and motor

largest of the trigeminal branches

54
Q

V3 enters through / main trunk between

A

foramen ovale

lateral pterygoing m. and tensor palati m.

55
Q

V3 divides into 3 branches in infratemporal fossa

A

main trunk
anterior division
posterior division

56
Q

main trunk of V3

A 
MMTT
meningeal n. (sensory)
nerve to medial pterygoid m. (motor)
nerve to tensor palati m. (motor)
nerve to tensor tympani m. (motor)
57
Q

meningeal n. innervates/path

A

sensory to dura

foramen spinosum w/ middle meningeal a.

58
Q

main trunk branches to medial pterygoid m., tensor palati m., tensor tympani

A

motor nerves to respective muscles

59
Q

anterior division, V3

A 
primarily motor
nerve to masseter m. (motor)
anterior deep temporal n. (motor)
posterior deep temporal n. (motor)
nerve to lateral pterygoid m. (motor)
long buccal n. (sensory)
60
Q

nerve to masseter muscle innervates

A

motor to masseter
passes through mandibular notch to reach masseter m.
small sensory branch to TMJ??

61
Q

temporalis m. innervated by

A

anterior and posterior deep temporal nn. (motor)

62
Q

lateral pterygoid m. innervated by

A

anterior branch of V3 - nerve to lateral pterygoid m. (motor)

63
Q

long buccal n. innervates

A

sensory to skin/mucous membrane of cheek, retromolar pad, buccal gingiva of mandibular molars

64
Q

long buccal n. path

A

between two heads of the lateral pterygoid m.

courses under the masseter m. toward buccal/oral region

65
Q

posterior division of V3

A

mostly sensory
auriculotemporal n.
inferior alveolar n. (mylohyoid n. and mental n.)
lingual n.

66
Q

auriculotemporal n.

A

arises via two roots (which circle the middle meningeal a.)
SENSORY to parotid sheath, TMJ, anterior part of auricle, skin lining external auditory meatus, and skin/scalp over the temporal region

CARRIES postganglionic parasympathetic fibers from the otic ganglion to the parotid gland

67
Q

which nerve goes around which artery?

A

auriculotemporal n. encircles the middle meningeal a.

68
Q

carries postganglionic parasympathetic fibers from the otic ganglion to the parotid gland

A

auriculotemporal n. (branch of V3)

69
Q

inferior alveolar n.

A

sensory to mandibular teeth and buccal gingiva of mandibular incisors, canines, and premolars (carries motor and sensory until it drops off the mylohyoid n.)

goes through mandibular foramen

gives off mylohyoid n. and mental n.

70
Q

mylohyoid n.

A

MOTOR to mylohyoid m. and anterior belly of digastric m.

inferior alveolar n. gives rise to it before entering the mandibular canal

71
Q

mental n.

A

branch of inferior alveolar n.

passes through mental foramen - sensory to chin/lower lip, mucous membrane of lower lip, and labial gingiva near mandibular incisors, canines, and premolars

72
Q

lingual n.

A

sensory to anterior 2/3 of tongue, floor of mouth, and adjacent lingual gingiva

CARRIES taste fibers from chorda tympani n. (CN 7): taste on anterior 2/3 of tongue AND preganglionic parasympathetic fibers (also from chorda tympani) to the submandibular ganglion (and some postganglionic parasympathetic fibers from the ganglion to the glands) to mediate secretions of the submandibular and sublingual salivary glands

73
Q

what types of nerve fibers travel with the lingual?

A

lingual = sensory
chorda tympani n. = taste, preganglionic parasympathetic
postganglionic parasympathetic fibers to the glands

74
Q

chorda tympani n.

A

taste - anterior 2/3 tongue (CN 7)
preganglionic parasympathetic fibers to submandibular ganglion - secretions of the submandibular and sublingual salivary glands

75
Q

submandibular ganglion

A

where preganglionic parasympathetic fibers of the chorda tympani (CN 7) synapse to mediate secretions of the submandibular and sublingual salivary glands

76
Q

otic ganglion

A

parasympathetic ganglion
just inferior to the foramen ovale
preganglionic parasympathetic fibers from the LESSER PETROSAL N. branch of glossopharyngeal n. (CN 9) synapse there

postganglionic parasympathetic fibers pass from the otic ganglion to the parotid gland via. auriculotemporal n. - secretomotor fibers that mediate parotid gland secretion

77
Q

auriculotemporal n. carries with it

A

postganglionic parasympathetic fibers from the otic ganglion to the parotid gland

78
Q

chorda tympani n.

A

taste, anterior 2/3 tongue
carries preganglionic parasympathetic secretomotor fibers that target the submandibular ganglion to regulate secretions of the submandibular and sublingual salivary glands

joins the lingual n.

79
Q

taste fibers are what type of fibers?

A

parasympathetic

80
Q

this cranial nerve acts as a highway or scaffold for other nerves?

A

trigeminal

Gross Anatomy Unit 3 (4 decks)

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