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Anatomy Quarter 2- 2023 > Lecture 24: Temporal and Infratemporal fossa > Flashcards

Lecture 24: Temporal and Infratemporal fossa Flashcards

1
Q

mastication

A

mechanical breakdown of food within the oral cavityw

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2
Q

what are the two types of mastication

A

slicing/puncture and grinding

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3
Q

what bones make up the temporomandibular joint

A

condyle of the mandible and the mandibular fossa of the temporal bone

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4
Q

what divides the TMJ into dorsal and ventral halves

A

thin cartilaginous disc

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5
Q

what does the dorsal half of TMJ allow

A

permits mandibular condyle to slide rostrally or caudally back into place

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6
Q

what does ventral half of TMJ allow

A

permits a hinge-like opening and closing

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7
Q

what ligament in TMJ prevents lateral displacement of condyle and when the mouth is open, excessive rostral displacement

A

lateral ligament

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8
Q

what prevents posterior displacement of TMJ

A

retroarticular prodcess

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9
Q

what prevents ventral displacement of TMJ

A

joint capsule and surrounding muscles

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10
Q

what cranial nerve innervates all muscles of mastication

A

CN V3- mandibular branch of trigeminal

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11
Q

what are the four major muscles of mastication

A

temporalis, lateral pterygoid, medial pterygoid and masseter

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12
Q

temporalis OINA

A

O: temporalis fossa (some fibers from nuchal crest)
I: coronoid process on mandible
N: CN V3- mandibular
A: bilateral- jaw closing

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13
Q

Masseter OINA

A

O: zygomatic arch
I: angular process and masseteric fossa of mandible
N: CN V3- mandibular
A: bilateral- jaw closing, unilateral- superficial fibers protract and deep fibers retract or move laterally

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14
Q

medial pterygoid OINA

A

O: pyterygopalatine fossa
I: medial aspect of mandibular ramus and angular process
N: CN V3- mandibular
A: bilateral- jaw closing, unilateral- protraction

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15
Q

lateral pterygoid OINA

A

O: pterygoidpalatine fossa
I: capsule of TMJ and the articular disk
N: CN V3- mandibular
A: control the position of the articular disk during jaw movement

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16
Q

what muscles are the predominant muscles for mastication in carnivores and omnivores

A

temporalis muscle

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17
Q

what is the difference between the zygomatic arch and coronoid process in carnivores and omnivores vs herbivores

A

carnivores and omnivores- zygomatic arch flares laterally to accommodate for larger coronoid process and muscle mass

herbivores: zygomatic arch is usually less prominent and coronoid process is greatly reduced

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18
Q

what are the predominant muscles for mastication in herbivores

A

masseter and medial pterygoid

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19
Q

how is the TMJ restricted in species where slicing and crushing are primary mastication functions

A

unilateral protraction and retraction are restricted by a more hinge-like TMJ

20
Q

how is the TMJ restricted in a species where grinding is more important

A

unilateral protraction and retraction is very important therefore TMJ is less restricted rostrally

21
Q

mylohyoid OINA

A

O: along the length of the medial aspect of the mandibular body
I: midline raphe with fibers from opposite muscle and basihyoid
N: myloyhoid nerve from CN V3
A: raises the floor of oral cavity to support the tongue and draws basihyoid rostrally

22
Q

diagastric muscle OINA

A

O: paracondylar process
I: medial and ventral aspect of the mandible
N: rostral-mylohyoid CN V3 and facial CN VII
A: active depression of mandible

23
Q

occipitomandularis

A

accessory belly of caudal diagastric found in horses

24
Q

what nerve provides motor innervation to muscles of mastication and sensory innervation to ear, cheek, jawline, lower lip, tongue, and mandibular teeth

A

mandibular nerve

25
Q

where does buccal nerve run

A

runs rostrally passing dorsal to lateral ptyergoid

26
Q

what nerve innervates the skin of the cheek and underlying oral mucosa

A

buccal nerve

27
Q

where does the auriculotemporal nerve run

A

travels laterally passing caudal to retroarticular process to emerge on the superficial surface of face between masseter and auricular cartilage

28
Q

what nerve innervates parts of the external ear, most of skin overlying temporalis, masseter, and zygomatic arch

A

auriculotemporal nerve

29
Q

what is the pathway for the inferior alveolar nerve

A

travels ventrally passing between two pterygoids to enter mandibular foramen

30
Q

what nerve innervates mandibular teeth

A

inferior alveolar nerve

31
Q

what nerve carries sensory information from skin of the chin

A

mental nerve

32
Q

what nerve innervates skin ventral to mandibular body and continues rostrally to innervate mylohyoid and rostral diagastric muscles

A

mylohyoid nerve

33
Q

what is the pathway of lingual nerve

A

runs parallel and rostral to inferior alveolar nerve passing medially to mandible to enter the caudal aspect of the oral cavity

34
Q

what nerve carries sensory innervation to the rostral two thirds of the tongue and lingual mucosa

A

lingual nerve

35
Q

what nerve carries special sensory (taste) and preganglionic PNS fivers from facial nerve

A

lingual nerve

36
Q

what artery is the main blood supply to deep and extra cranial regions of the head

A

maxillary artery

37
Q

what are the 3 parts of maxillary artery

A

mandibular, pterygoid, pterygopalatine

38
Q

what supplies blood to temporalis, masseter and part of pterygoid mass, TMJ and ear

A

mandibular portion of maxillary artery

39
Q

what are two branches of mandibular artery

A

inferior alveolar- runs with nerve
middle meningeal artery

40
Q

where does the middle meningeal artery enter

A

oval foramen

41
Q

what is the largest of the blood vessels to the dura and calvaria

A

middle meningeal artery

42
Q

what supplies blood to part of temporalis, pterygoid, orbit, palate and nasal cavity

A

pterygopalatine portion of maxillary artery

43
Q

what artery branches off pterygopalatine artery

A

buccal artery

44
Q

what vein provides the primary connection between venous drainage of deep parts of the head and superficial venous system

A

maxillary vein

45
Q

how is the maxillary vein formed

A

union of smaller veins from pterygoid plexus caudal to alar canal

46
Q

what two veins join together to form external jugular vein

A

maxillary and linguofacial

Anatomy Quarter 2- 2023 (39 decks)

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