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KYCO 2020 1st year, Block 3 > Anatomy: Temporal & Infratemporal Fossae Part 2 > Flashcards

Anatomy: Temporal & Infratemporal Fossae Part 2 Flashcards

1
Q

Branches of the anterior division of V3 (mandibular division of the trigeminal nerve

A
  • Nerve to the masseter
  • Nerve to the lateral pterygoid
  • Deep temporal nerves
  • Buccal nerve
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2
Q

Nerve to the masseter innervates the ….

A

Masseter; gives a few sensory fibers to the anterior aspect of the temporomandibular joint because it’s in that vicinity

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3
Q

Nerve to the lateral pterygoid innervates the …

A

Pterygoid

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4
Q

Deep temporal nerves

A

Usually 2 (anterior & posterior) nerves; sometimes there’s a third (middle) nerve

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5
Q

Buccal nerve supplies ….

A

Sensory innervation!!!! To the skin and mucosa of the cheek

Buccal branch of 7 (facial nerve) = motor
Buccal branch of 5 (trigeminal nerve)= sensory

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6
Q

Branches of the posterior division of V3 (mandibular division of trigeminal nerve)

A
  • Auriculotemporal nerve
  • Inferior alveolar nerve
  • Nerve to the mylohyoid
  • Lingual nerve
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7
Q

Auriculotemporal nerve

A
  • Originates as two roots that encircle the middle meningeal artery and reunite posterior to the artery
  • Provides sensory innervation to the auricle, external auditory meatus, tympanic membrane, temporomandibular joint and scalp.
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8
Q

Inferior Alveolar Nerve

A
  • Contains both sensory & motor fibers
  • Enters mandibular foramen to supply all of the mandibular teeth
  • Exits mandible at mental Foramen and continues as mental nerve
  • -Before entering the mandibular foramen, the NERVE TO THE MYLOHYOID is given off

[alveolar = teeth]

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9
Q

Nerve to the mylohyoid

A
  • A motor branch of the inferior alveolar nerve

- Innervates the mylohyoid and the anterior belly of the digastric

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10
Q

Lingual nerve

A
  • Provides general sensory info (touch, pain, temp) to anterior 2/3 of the tongue and the mucosa of the floor of the mouth
  • Joined high in the infratemporal fossa by the chorda tympani
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11
Q

A small, PARASYMPATHETIC GANGLION located inferior to the foramen ovale (in the temporal fossa) and medial to V3; Tympanic branch of CN IX forms the tympanic plexus (supplies the mucosa of the tympanic cavity)

A

Otic ganglion

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12
Q

Fibers in the Otic Ganglion

A
  • Preganglionic Parasympathetic

- Postganglionic Parasympathetic

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13
Q

Fibers that leave the tympanic plexus in the form of the LESSER PETROSAL NERVE and synapse in the otic ganglion

A

Preganglionic Parasympathetic

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14
Q

Fibers that leave the otic ganglion and join the auriculotemporal nerve

A

Postganglionic parasympathetic

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15
Q

What do the postganglionic parasympathetic fibers leaving the otic gland innervate?

A

Parotid Gland

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16
Q

Where does the chorda tympani originate from?

A

CN VII (facial nerve) in the facial canal just above the stylomastoid foramen.

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17
Q

Path of the chorda tympani

A
  • Enters tympanic cavity and courses across the medial side of the tympanic membrane (ear drum)
  • EXITS THE TEMPORAL BONE VIA THE PETROTYMPANIC FISSURE
  • Enters the infratemporal fossa where it JOINS THE LINGUAL NERVE (important b/c it is transmitting the taste fibers (sensory) of the anterior 2/3 of the tongue)
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18
Q

What special fibers does the chorda tympani contain, and what are they for?

A

Special sensory or tats fibers for the anterior 2/3 of the tongue

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19
Q

Fibers of the chorda tympani

A
  • Preganglionic parasympathetic fibers

- Postganglionic parasympathetic fibers

20
Q

Where do the preganglionic parasympathetic fibers of the chorda tympani synapse?

A

Submandibular ganglion

21
Q

What do the postganglionic parasympathetic fibers from the chorda tympani supply?

A

Submandibular and Sublingual Salivary Glands

22
Q

What are the two terminal branches of the external carotid artery?

A

Maxillary Artery

Superficial Temporal Artery

23
Q

Terminal branch of the external carotid artery; Arises posterior to the neck of the mandible; Divided into 3 parts based on its relation to the lateral pterygoid muscle, with each part having a specific branch.

A

Maxillary Artery

24
Q

Parts of the maxillary artery (wouldn’t ask us on the test)

A
  1. Mandibular Part
  2. Pterygoid Part
  3. Pterygopalatine Part
25
Q

Part of Maxillary artery that lies between the neck of the mandible and the sphenomandibular ligament.

A

Mandibular (first) part

26
Q

What accompanies the mandibular part of the maxillary artery?

A

AURICULOTEMPORAL NERVE

MAXILLARY VEIN

27
Q

Five branches of the mandibular part of the maxillary artery

A
  • Deep auriculotemporal
  • Anterior tympanic
  • Middle meningeal
  • Accessory meningeal
  • Inferior alveolar
28
Q

Artery that supplies the external auditory meatus and the outer surface of the tympanic membrane

A

Deep auricular artery

29
Q

Artery that passes through the petrotympanic fissure with the chorda tympani to supply the mucosa of the tympanic cavity

A

Anterior tympanic artery

30
Q

Artery that passes between the two roots of the auriculotemporal nerve; passes through the foramen spinosum to enter the middle cranial fossa to supply the dura mater and skull

A

Middle meningeal artery

31
Q

What is an epidural, and which artery does it correspond to?

A

Epidural: hematoma on top of the dura

Middle meningeal artery

32
Q

Artery that passes through the Foramen ovale (along with V3) to supply the trigeminal ganglion and adjacent dura mater.

A

Accessory meningeal artery

33
Q

Artery that accompanies the inferior alveolar nerve in the mandibular canal; exits the mental Foramen with the mental herve.

A

Inferior alveolar artery

34
Q

What does the inferior alveolar artery give off before entering the mandibular foramen?

A

Artery to the mylohyoid

35
Q

Part of the maxillary artery that passes anteriorly and superiorly in the infratemporal fossa.

A

Pterygoid (second) part

36
Q

What are the branches of pterygoid part of the maxillary artery, and what accompanies them?

A
  • Masseteric artery
  • Anterior and Posterior deep temporal arteries
  • Pterygoid arteries
  • Buccal artery

-Branches all accompany branches of V3 (Mandibular part of the trigeminal nerve).

37
Q

Masseteric artery supplies the …?

A

Masseter

38
Q

Anterior & Posterior deep temporal arteries supply the …?

A

Temporalis muscle

39
Q

Pterygoid arteries supply the …?

A

Medial and lateral pterygoids

40
Q

Buccal artery supplies the …?

A

Buccinator
Skin of cheek
Mucosa of oral cavity

  • *Buccal branch of 5 = sensory
  • *Buccinator gets supplied by 7 = motor
41
Q

Why is venous drainage in the brain/head so important?

A

Everything is interconnected: deep vessels are connected to superficial vessels and vice versa

42
Q

A complex network of veins located partly between the temporalis and the pterygoid muscles

A

Pterygoid venous plexus

43
Q

What mainly drains into the pterygoid venous plexus?

A

Most of the veins that accompany branches of the maxillary artery

44
Q

What other deep venous structures does the pterygoid venous plexus communicate with?

A
  • Cavernous sinus
  • Inferior ophthalmic vein
  • Facial vein
45
Q

How does the pterygoid venous plexus communicate with the cavernous sinus?

A

Via small veins passing through the foramen ovale, foramen lacerum and sometimes a sphenoidal emissary (“weird little vein that runs into the cavernous sinus”) foramen.

46
Q

How does the pterygoid venous plexus communicate with the facial vein?

A

Via the deep facial vein

KYCO 2020 1st year, Block 3 (7 decks)

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