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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
medial pterygoid m.: innervation
medial pterygoid n. branch of V3
26
medial pterygoid m.: action
elevates the mandible, assists in protrusion
27
temporalis m. origin
floor of the temporal fossa (includes frontal, parietal, temporal, and greater wing of sphenoid bones)
28
temporalis m. insertion
medial surface, apex, and anterior border of the coronoid process; anterior border of the mandibular ramus
29
temporalis m. innervation
anterior and posterior deep temporal nn. branches of V3
30
temporalis m. action
elevates the mandible, posterior fibers retrude the mandible (bring it back)
31
masseter m. origin
both heads: inferior border of the zygomatic arch
32
masseter m. insertion
lateral surface of the ramus and angle of the mandible; anterolateral aspect of the coronoid process
33
masseter m. innervation
masseteric n. branch o V3
34
masseter m. action
elevates the mandible; superficial head - protrusion; deep head - retrusion
35
maxillary a. basics
terminal branch of external carotid a. 3 portions: 2 (mandibular and pterygoid portions) in infratemporal fossa, 1 (pterygopalatine portion) in pterygopalatine fossa
36
mandibular portion of maxillary a. location
runs b/w the neck of the mandible and sphenomandibular ligament, on the inferior border of the lateral pterygoid m.
37
mandibular portion of maxillary a. branches
DAM I A ``` deep auricular a. anterior tympanic a. middle meningeal a. inferior alveolar a. (mylohyoid a., mental a.) accessory meningeal a. ```
38
deep auricular a. supplies
lateral surface of the tympanic membrane, lining of external auditory meatus
39
anterior tympanic a. supplies
medial surface of tympanic membrane (after traversing the petrotympanic fissure)
40
middle meningeal a. supplies
dura and bones of skull; enters skull via foramen spinosum
41
accessory meningeal a. supplies
trigeminal ganglion and dura; enters skull via foramen ovale
42
inferior alveolar 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
2nd section of maxillary artery includes
aka the pterygoid portion MDPB masseteric a. deep temporal aa. (anterior and posterior) pterygoid branches buccal a.
44
2nd section of maxillary artery passes
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
masseteric a. supplies
the masseter muscle (traverses the mandibular notch)
46
deep temporal aa. supply
temporalis m.
47
pterygoid branches supply
medial and lateral pterygoid mm.
48
buccal a. supplies
buccinator m. and mucous membrane of oral vestibule
49
3rd section of maxillary artery courses
within the pterygopalatine fosa, just inferior to the maxillary division of the trigeminal nerve (V2)
50
3rd section of maxillary a. branches
``` posterior superior alveolar a. infraorbital a. artery of pterygoid canal pharyngeal a. descending palatine a. sphenopalatine a. ```
51
pterygoid plexus of veins consists of
``` pterygoid vv. masseteric v. deep temporal vv. buccal v. alveolar vv. meningeal vv. palatine vv. sphenopalatine v. ```
52
pterygoid plexus of veins drains into/communicates with
drains into: maxillary v. (tributary of retromandibular v.) communicates with: opthalmic veins, facial vein, and cavernous sinus
53
mandibular division of trigeminal n. (V3) fibers
sensory and motor largest of the trigeminal branches
54
V3 enters through / main trunk between
foramen ovale lateral pterygoing m. and tensor palati m.
55
V3 divides into 3 branches in infratemporal fossa
main trunk anterior division posterior division
56
main trunk of V3
``` MMTT meningeal n. (sensory) nerve to medial pterygoid m. (motor) nerve to tensor palati m. (motor) nerve to tensor tympani m. (motor) ```
57
meningeal n. innervates/path
sensory to dura | foramen spinosum w/ middle meningeal a.
58
main trunk branches to medial pterygoid m., tensor palati m., tensor tympani
motor nerves to respective muscles
59
anterior division, V3
``` 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
nerve to masseter muscle innervates
motor to masseter passes through mandibular notch to reach masseter m. small sensory branch to TMJ??
61
temporalis m. innervated by
anterior and posterior deep temporal nn. (motor)
62
lateral pterygoid m. innervated by
anterior branch of V3 - nerve to lateral pterygoid m. (motor)
63
long buccal n. innervates
sensory to skin/mucous membrane of cheek, retromolar pad, buccal gingiva of mandibular molars
64
long buccal n. path
between two heads of the lateral pterygoid m. | courses under the masseter m. toward buccal/oral region
65
posterior division of V3
mostly sensory auriculotemporal n. inferior alveolar n. (mylohyoid n. and mental n.) lingual n.
66
auriculotemporal n.
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
which nerve goes around which artery?
auriculotemporal n. encircles the middle meningeal a.
68
carries postganglionic parasympathetic fibers from the otic ganglion to the parotid gland
auriculotemporal n. (branch of V3)
69
inferior alveolar n.
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
mylohyoid n.
MOTOR to mylohyoid m. and anterior belly of digastric m. inferior alveolar n. gives rise to it before entering the mandibular canal
71
mental n.
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
lingual n.
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
what types of nerve fibers travel with the lingual?
lingual = sensory chorda tympani n. = taste, preganglionic parasympathetic postganglionic parasympathetic fibers to the glands
74
chorda tympani n.
taste - anterior 2/3 tongue (CN 7) preganglionic parasympathetic fibers to submandibular ganglion - secretions of the submandibular and sublingual salivary glands
75
submandibular ganglion
where preganglionic parasympathetic fibers of the chorda tympani (CN 7) synapse to mediate secretions of the submandibular and sublingual salivary glands
76
otic ganglion
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
auriculotemporal n. carries with it
postganglionic parasympathetic fibers from the otic ganglion to the parotid gland
78
chorda tympani n.
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
taste fibers are what type of fibers?
parasympathetic
80
this cranial nerve acts as a highway or scaffold for other nerves?
trigeminal

Gross Anatomy Unit 3 (4 decks)

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