Orbit Picture Cards

Question 1

Name the bones, holes, and the things that go through the holes.

Answer 1

1. Sphenoid bone
2. Superior orbital fissure: CNs III, IV, V1, VI, and ophthalmic veins
3. Supraorbital foramen: supraorbital nerve (V1)
4. Optic canal: optic nerve (CN II) and ophthalmic artery
5. Palatine bone
6. Lacrimal bone
7. Infraorbital foramen: infraorbital nerve (V2) and infraorbital artery
8. Ethmoid bone
9. Zygomatico-facial canal: zygomatico-facial nerve (V2)
10. Zygomatic bone
11. Inferior orbital fissure: infraorbital and zygomatic nerves and arteries (nerves are from V2)

Question 2

Name these holes. What spaces do these connect? What do they contain?

Answer 2

1. Anterior and posterior ethmoidal foramina. They connect the orbit and nasal cavities and contain anterior and posterior ethmoidal nerves (V1) and arteries (from ophthalmic a.).
2. Nasolacrimal duct opening. Drains tears to the inferior nasal concha.

Question 3

What happened?

Answer 3

Blowout fracture with protrusion of orbital contents into the maxillary sinus.

Question 4

Answer 4

1. Conjunctiva
2. Sclera
3. Cornea
4. Iris
5. Lens

Question 5

Answer 5

1. Check ligaments
2. Periorbital fascia
3. Tenon’s capsule - separates eye from periorbital fat.

Question 6

Answer 6

1. Supratrochlear nerve (V1)
2. Supraorbital nerve (V1)
3. Lacrimal nerve (v1)
4. Frontal nerve (V1)
5. V1 at the superior orbital fissure
6. V2 –> foramen rotundum
7. V3 –> foramen ovale
8. CN VI
9. CN III
10. CN IV going to the superior oblique

Question 7

Which one is the ophthalmic artery?

Answer 7

a

Question 8

Answer 8

1. Anterior ethmoidal artery
2. Posterior ethmoidal artery
3. Central artery of the retina
4. Ophthalmic artery
5. Posterior ciliary arteries
6. Lacrimal artery
7. Supraorbital artery
8. Supratrochlear artery

Question 9

Answer 9

1. Anterior ciliary arteries
2. Retina
3. Choroid
4. Sclera
5. Posterior ciliary arteries
6. Central artery and vein of the retina

Question 10

How would vision be affected if the right optic nerve were cut as seen here?

Answer 10

Right monocular blindness.

Question 11

How would vision be affected if the optic chiasm were compromised as seen here?

Answer 11

Bitemporal hemianopsia (loss of peripheral vision)

Question 12

How would vision be affected if the right optic tract were cut as seen here?

Answer 12

Loss of the left visual field.

Question 13

Answer 13

Infraorbital nerve and artery

Question 14

Also name their innervation.

Answer 14

1. Inferior oblique muscle
2. Inferior rectus
3. Medial rectus

CN III oculomotor

Question 15

Answer 15

1. Oculomotor nerve (CN III)
2. Abducens nerve (CN VI)
3. Ciliary ganglion

Question 16

Also name its innervation.

Answer 16

Lateral rectus - CN VI (abducens)

Question 17

Answer 17

1. Oculomotor nerve (CN III)
2. Ophthalmic artery

Question 18

Also name their innervation.

Answer 18

1. Superior rectus - CN III oculomotor
2. Superior oblique - CN IV trochlear

Question 19

Answer 19

1. Supraorbital nerve
2. Supratrochlear nerve