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MD2S3: Anatomy 203 > The Third, Fourth and Sixth Cranial Nerves > Flashcards

The Third, Fourth and Sixth Cranial Nerves Flashcards

1
Q

3rd Cranial Nerve
Origin

A

Midbrain medial to crus cerebri

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2
Q

3rd Cranial Nerve
Nuclei

A

Paired Occulomotor Nuclei
Pair EW Nuclei
Single Caudal Central Nucleus

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3
Q

3rd Cranial Nerve
Paired Occulomotor Nuclei function

A

Efferents to Extra-Occular Muscles

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4
Q

3rd Cranial Nerve
Paired EW Nucleus function

A

Efferents to Ciliary and Constrictor Pupilae Muscles

Parasympathetic

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5
Q

3rd Cranial Nerve
Single Caudal Central Nucleus function

A

Supply Levator Palpebrae Superioris Muscle

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6
Q

3rd Cranial Nerve
Course

A

Emerges from Midbrain medial to Crus Cerebri
Runs in Interpeduncular Fossa
Pierces lateral wall of Cavernous Sinus

Interpeduncular Fossa
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7
Q

3rd Cranial Nerve
Boundaries of Interpeduncular Fossa

A

Anterior: Optic Chiasma
Anterolateral: Optic Tracts
Posterolateral: Crus Cerebri
Posterior: Pons

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8
Q

3rd Cranial Nerve
Contents of Interpeduncular Fossa

A

Infundibulum
Mammilary Bodies
Posterior Perforated Substance

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9
Q

3rd Cranial Nerve
Divisions

A

Upper Division
Lower Division
Ciliary Ganglion

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10
Q

3rd Cranial Nerve
Upper Division supplies …

A

Levator Palpebri Superioris
Superior Rectus

Skeletal Muscles

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11
Q

3rd Cranial Nerve
Lower Division supplies …

A

Medial Rectus
Inferior Rectus
Inferior Oblique

Skeletal Muscles

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12
Q

3rd Cranial Nerve
Ciliary Ganglion supplies …

A

Ciliary Muscles
Sphincter Pupillae

Smooth Muscles responsible for reflexes (Light and Accommodation pathways)

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13
Q

3rd Cranial Nerve
Roots of Ciliary Ganglion

A

Motor Root: EW nucleus → 3rd Nerve → Ciliary Ganglion
Sensory Root: Nasocilliary Nerve (5th Cranial Nerve branch)
Sympathetic Root: Plexus around Internal Carotid Artery supplying CM and SP

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14
Q

3rd Cranial Nerve
What is Oculomotor Nerve Palsy

A

LMNL lesion affecting Occulomotor Nerve or Nuclei in the Midbrain

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15
Q

3rd Cranial Nerve
Is the Lesion Ipsilateral or Contralateral?

A

Ipsilateral

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16
Q

3rd Cranial Nerve
Consequences of Oculomotor Nerve Palsy

A

Ptosis (paralysis of Levator Palpebrae Superioris)
Lateral/Divergent Squint (Paralysis of Adductors)
Diplopia - Double Vision
Mydriasis - Pupillary Dilatation
Loss of Accommodation and Light Reflexes

17
Q

4th Cranial Nerve
Origin

A

Dorsal surface of Midbrain

18
Q

4th Cranial Nerve
Nuclei

A

Trochlear Nucleus gives somatic efferent fibers to Superior Oblique

19
Q

4th Cranial Nerve
Course

A

Emerges from Dorsum of Midbrain
Winds around Superior Cerebellar Peduncle
Pierces Lateral Wall of Cavernous Sinus

20
Q

4th Cranial Nerve
Effects of Trochlear Nerve Palsy

A

LMNL causing Paralysis of Superior Oblique
Contralateral Convergent Squint (Eye up and Medial)
Diplopia (when going down stairs and reading books)

21
Q

6th Cranial Nerve
Origin

A

Pontomedullary Groove between Pons and Pyramid

22
Q

6th Cranial Nerve
Nucleus

A

Abducent Nucleus gives Somatic Efferents to Lateral Rectus

23
Q

6th Cranial Nerve
Course

A

Nerve emerges between Pons and Pyramid
Runs upwards and forwards piercing wall of Cavernous Sinus

24
Q

6th Cranial Nerve
Abducent Nerve Palsy

A

LMNL Paralysis of Lateral Rectus
Ipsilateral Convergent Squint
Diplopia when looking lateral

MD2S3: Anatomy 203 (31 decks)

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