Anatomy

Question 1

Name the bones that form the orbital cavity.

Answer 1

1- Maxilla.
2- Zygomatic bone.
3- Greater wing of sphenoid bone.
4- Frontal bone.
5- Ethmoid bone.
6- Lacrimal bone.
7- Palatine bone.

Question 2

what does the space between the eyelids called?

Answer 2

Palpebral fissure.

Question 3

What is the :
1- nerve supply.
2- Function.
of the Orbicularis oculi muscle ?

Answer 3

1- Facial nerve.

2- closes the eyelids.

Question 4

Loss of function of either the ……….. muscle or the ………… muscle results in a Ptosis or drooping of the upper eyelid.

Answer 4

Levator palpebrae superioris - superior tarsal -

Question 5

What is the function of the Lacrimal apparatus ?

Answer 5

production, movement and drainage of fluid from the surface of the eyeball.

Question 6

What are the components of lacrimal apparatus?

Answer 6

1- Lacrimal gland and its ducts.
2- Lacrimal canaliculi.
3- Lacrimal sac.
4- naso-lacrimal duct.

Question 7

Name the structures that pass through the optic canal.

Answer 7

1- Optic nerve.

2-Ophthalmic artery.

Question 8

Name the structures that pass through the Superior orbital fissure.

Answer 8

1- Superior and Inferior branches of the oculomotor nerve.
2- Trochlear nerve.
3- Abducent nerve.
4- Lacrimal, frontal and nasociliary branches of the Ophthalmic nerve.
5- Superior ophthalmic vein.

Question 9

Name the structures that pass through the Inferior orbital fissure.

Answer 9

1- Maxillary nerve and its zygomatic branches.
2- Infra-orbital vessels.
3- A vein communicating with the pterygoid plexus of veins.

Question 10

Name the Extrinsic muscle of the eyeball.

Answer 10

1- Levator Palpebrae supreioris.
2- Superior rectus.
3- Inferior rectus
4- medial recrus.
5- Lateral rectus.
6- Superior oblique.
7- Inferior oblique.

Question 11

Name the intrinsic muscle within the eyeball.

Answer 11

1- Ciliary muscle.
2- Sphincter pupillae.
3- dilator pupillae.

Question 12

All of the extra-ocular muscles are innervated by ……………… except ……………. which is innervated by …………… .

Answer 12

oculomotor nerve - the Lateral rectus =Abducent nerve and and Superior obligue = Trochlear nerve .

Question 13

What is the function of Meibomian glands “Tarsal glands”?

Answer 13

Production of the oily layer of the tear film.

Question 14

What is a Limbus ?

Answer 14

It’s the marginal region of the cornea that continuous with the sclera.

Question 15

What’s an orbital septum?

Answer 15

It’s a fibrous tissue that originate from the periosteum of orbital rim and acts as a barrier between eyelid skin and orbit.