Nerves of the eye

Question 1

Identify 1 -> 2

Answer 1

1. Frontal n. (CN V1)
2. Lacrimal n. (CN V1)

Question 2

Identify 3 → 4

Answer 2

3. Nasociliary n. (CN V1)
4. Trochlear n. (CN IV)

Question 3

Identify 5 → 6

Answer 3

5. Optic n. (CN II)
6. Abducens n. (CN VI)

Question 4

Identify 1 → 2

Answer 4

1. Frontal n. (CN V1)
2. Lacrimal n. (CN V1)

Question 5

Identify 3

Answer 5

3. Nasociliary n. (CN V1)

Question 6

Identify 4

Answer 6

4. Trochlear n. (CN IV)

Question 7

Identify 5

Answer 7

5. Optic n. (CN II)

Question 8

Identify 6 - 8

Answer 8

• 6/ Abducens n. (CN VI)
• 7/ Superior division of oculomotor n. (CN III)
• 8/ Inferior division of oculomotor n. (CN III)

Question 9

2 major types of sensory innervation of the eye

Answer 9

• Vision (special somatic afferent) via optic n.
• General sensation (general somatic afferent) via ophthalmic (and some maxillary) divisions of trigeminal

Question 10

2 major types of sensory innervation of the eye

1. Vision (special somatic afferent) via ___
2. General sensation (general somatic afferent) via ____

Answer 10

1. optic n.
2. ophthalmic (and some maxillary) divisions of trigeminal

Question 11

2 major types of motor innervation of the eye

Answer 11

• Motor to extraocular mm. (general somatic efferent)
• Autonomics to intrinsic muscles of the eye (general visceral efferent)

Question 12

2 major types of motor innervation of the eye

• Motor to extraocular mm. (general somatic efferent) via ____
• Autonomics to intrinsic muscles of the eye (general visceral efferent)

Answer 12

oculomotor, trochlear, and abducens nn.

Question 13

2 major types of motor innervation of the eye

• Autonomics to intrinsic muscles of the eye (general visceral efferent) via ____ (2)

Answer 13

• Parasympathetics associated with ciliary ganglion
• Sympathetics associated with superior cervical ganglion

Question 14

2 major types of motor innervation of the eye

• Autonomics to intrinsic muscles of the eye (general visceral efferent) via…
  
  1. Parasympathetics associated with____
  2. Sympathetics associated with ____

Answer 14

1. ciliary ganglion
2. superior cervical ganglion

Question 15

Ophthalmic Sensory Innervation to the Orbit

→ identify

Answer 15

1. Frontal nerve
2. Lacrimal nerve
3. Supraorbital n
4. Supratrochlear n
5. Nasociliary n

Question 16

Ophthalmic Sensory Innervation to the Orbit

Source of lacrimal and frontal nn.

Answer 16

Ophthalmic division of CN V

Question 17

Ophthalmic Sensory Innervation to the Orbit

Lacrimal n.

→ Passes anteriorly to enter orbit through (1)_____

→ Before reaching lacrimal gland, it communicates with (2)____ to receive autonomic nervous fibers

Answer 17

1. superior orbital fissure
2. zygomatic branch of maxillary division of trigeminal

Question 18

Ophthalmic Sensory Innervation to the Orbit

Frontal n.

→ Passes anteriorly to enter orbit through (1)_____

→ About halfway in orbit, it divides into 2 terminal nerves which are (2)____

Answer 18

1. superior orbital fissure
2. Supraorbital and supratrochlear nn.

Question 19

Identify

Answer 19

1. Sensory root of the ciliary ganglion
2. Long ciliary nn.
3. Infratrochlear n.
4. Anterior ethmoidal n.
5. Posterior ethmoidal n.

Question 20

Source of these nerves

1. Sensory root of the ciliary ganglion
2. Long ciliary nn.
3. Infratrochlear n.
4. Anterior ethmoidal n.
5. Posterior ethmoidal n.

Answer 20

1 → Ophthalmic division of trigeminal

2 - 5 → Nasociliary nerve

Question 21

Maxillary Sensory Innervation to the Orbit

Answer 21

1. Zygomaticofacial n.
2. Zygomaticotemporal n.
3. Maxillary n.
4. Zygomatic n.
5. Infraorbital n.

Question 22

Maxillary Sensory Innervation to the Orbit

Zygomatic nerve

→ Enters orbit via (1)_____
→ Within orbit, it divides into (2)____ and ___

Answer 22

1. inferior orbital fissure
2. zygomaticotemporal and zygomaticofacial branches

Question 23

Motor Innervation to the Orbit

→ identify

Answer 23

1. Trochlear n. (CN IV)
2. Superior division of CN III
3. Inferior division of CN III
4. Abducens n. (CN VI)