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Gross Anatomy Module 4 > Cranial Nerve 5 > Flashcards

Cranial Nerve 5 Flashcards

1
Q

CN5

A

emerges from brainstem as large sensory (GSA) root and small motor (SVE) root

Resident fibers: GSA, SVE *muscles of first pharyngeal arch

Acquired: SA, GVE (parasympathetic fibers to SM and glands)

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2
Q

Emerges from brainstem..

A

and courses anteriorly to reach MIDDLE CRANIAL FOSSA

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3
Q

Trigeminal ganglion

A

Located in Trigeminal impression/cave (Meckel’s cave)

From ganglion, emerge V1, V2, V3

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4
Q

V1

A

passes lateral wall of cavernous sinus to reach superior orbital fissure

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5
Q

V2

A

passes lateral wall of cavernous sinus to reach foramen rotundum

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6
Q

V3

A

inferior course to reach foramen ovale

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7
Q

Branches of Ophthalmic N (V1)

A
  1. Meningeal branch
  2. Lacrimal n
  3. Frontal n
    - Supraorbital n
    - Supratrochlear n
  4. Nasociliary n
    - Sensory root to ciliary ganglion–> short ciliary n
    - Long ciliary n
    - Posterior ethmoidal n
    - Anterior ethmoidal n-> internal and external nasal branches
    - Infratrochlear n
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8
Q

Meningeal branch

A

aka tentorial nerve

sensory branch, emerges from V1 before it traverses superior orbital fissure

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9
Q

Lacrimal, frontal and nasociliary nerves

A

Before opthamlamic n traverses superior orbital fissure to enter orbit, gives off these branches

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10
Q

Lacrimal n

A

Travels along lateral border of orbit to reach lacrimal gland and lateral eye

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11
Q

Frontal n

A

Within orbit, frontal branches into supraorbital and supratrochlear n (course anteriorly through orbit to emerge superior to eye)

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12
Q

Nasociliary n

A

Travels in plane deep to lacrimal and frontal nerves

Branches:

  1. Sensory root –> ciliary ganglion-> short ciliary nerves
  2. Long ciliary nerves
  3. Posterior ethmoidal n (exits orbit via posterior ethmoidal foramen)
  4. Anterior ethmoidal n (exits orbit via anterior ethmoidal foramen)
    - -gives rise to internal/external nasal branches
  5. Infratrochlear n
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13
Q

Branches of Maxillary Nerve (V2)

A
  1. Meningeal branch before traversing foramen rotundum
    Branches in PPF
  2. Zygomatic n (zygomaticotemporal n, zygomaticofacial n)
  3. Communicating branches (2) with pterygopalatine ganglion
    – orbital, medial and lateral posterior superior nasal, has-palatine, greater palatine [greater palatine gives off lateral posterior inferior nasal n], lesser palatine, pharyngeal)
    -Nerve of pterygoid canal carries fibers from CN7–> PPG
  4. Posterior superior alveolar n
  5. Infraorbital n (continuation of maxillary n)
    -Middle superior alveolar n
    -Anterior superior alveolar n
    -Terminal branches (palpebral, nasal, superior labial)
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14
Q

Meningeal branch

A

In middle cranial fossa, before V2 courses foramen rotundum to enter PPF

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15
Q

Zygomatic nerve

A

In PPF, enters orbit via INFERIOR ORBITAL FISSURE –> zygomaticofacial and zygomaticoptermporal nerves, LEAVE orbit and emerge on face via same named foramina.

note: communicating branch from zygomaticotemporal n to lacrimal n

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16
Q

Communicating roots to PPG (pterygopalatine nerves)

A 
PPG suspended from V2 via 2 communicating branches (primary GSA fibers)
GSA fibers pass through PPG, without interruption and into following branches:
1. orbital branches
2. medial posterior superior nasal n
3. lateral posterior superior nasal n
4. nasopalatine n
5. greater palatine n
6. lesser palatine n
7. pharyngeal n
  • Posterior superior alveolar n
  • Infraorbital n
17
Q

Orbital branches

A

traverse inferior orbital fissure to reach orbit

18
Q

Medial posterior superior nasal, lateral posterior superior nasal and nasopalatine nerves

A

Traverse sphenopalatine formane to enter nasal cavity

19
Q

Pharyngeal n

A

Travels in palatovaginal canal to reach nasopharynx

20
Q

Greater palatine and lesser palatine nerves

A

descend in greater palatine canal to reach palate

21
Q

Nerve of pterygoid canal (includes GVE and SA fibers from CN-7)

A

course pterygoid canal to reach PPG

22
Q

Posterior superior alveolar n

A

Leaves PPF through pterygomaxillary fissure and enters maxilla via alveolar foramen

23
Q

Infraorbital nerve

A

Name change occurs as V2 traverses inferior orbital fissure. Courses in infraorbital groove and canal before emerging on face via infraorbital foramen

24
Q

lnfraorbital n gives rise to

A

Middle superior alveolar n
Anterior superior alveolar n

Infraorbital n terminates as palpebral, nasal and labial branches

25
Q

Superior Dental Plexus

A

Formed by nerves that carry sensory info from maxillary teeth and adjacent gingival tissue

26
Q

Structures of superior dental plexus

A
  • Posterior superior alveolar n (branch off maxillary n)
  • Middle superior alveolar n (branch off infraorbital n)
  • inconsistent, when absent, territory supplied by anterior superior alveolar n (or posterior superior alveolar n)
  • Anterior superior alveolar n (branch off infraorbital n)
27
Q

Innervation of Tooth via Dental

A

Dental pulp innervated by A-delta and C-fibers from CN-V (GSA) + postganglionic sympathetic nerve fibers from superior cervical ganglion (GVE).

  • A delta and C fibers enter root canal along with Bfs and ramify as a plexus. Nerve fibers may continue into odontoblast layer and enter dentinal tubules
  • GVA fibers in pulp that provide CNS with info regarding vascular tone
28
Q

Branches of Mandibular Nerve (V3)

A 
Immediate Branches
-Meningeal branch
-N to medial pterygoid 
Anterior Division
-N to lateral pterygoid
-Deep temporal nerves (anterior and posterior)
-Masseteric n
-Long buccal n 
Posterior Division
-Auriculotemporal n
-Lingual n (receives chorda tympani n from CN7)
-Inferior alveolar n
(gives off n to mylohyoid, terminates as mental nerve and incisive n)
29
Q

Nervus spinosus

A

Recurrent meningeal branch, re-enters cranial cavity via foramen spinosum (travels with middle meningeal a) and carries GSA from meninges of anterior and middle cranial fossae

30
Q

Nerve to medial pterygoid

A

motor (SVE) and proprioceptive (GSA) to medial pterygoid muscle; sends small branches to tensor tympani muscle and tensor veil palatine muscle

Gross Anatomy Module 4 (7 decks)

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