Anatomy Of The Orbit

Question 1

Optic Canal is made up of how many bones? Show the boundary they form

Answer 1

7

Roof: frontal bone
Roof and posterolateral: sphenoid bone
Lateral wall: zygomatic bone
Floor: maxilla
Medial wall: lacrimal, ethmoid and palatine bones

Question 2

Orbit is the anatomical bonded superiorly, inferiorly, medially and laterally by what?

Answer 2

Anterior cranial fossa
Maxillary sinus
Nasal cavity and ethmoidal air cells
Middle cranial fossa

Question 3

Orbit develops through which ossification?

Answer 3

— Endochondrial ossification (the part derived from the base of the skull)
— Membranous ossification(the remaining part)

Question 4

Orbit is derived embryonically from where
. Above
. Below and laterally
. Medial
. Behind

Answer 4

> Mesenchyme that encircle the optic vessels
Maxillary process
Fronto nasal process
Orbitisohenoid

Question 5

By what month will the laying down of bone start with the maxillary process

Answer 5

6-7th month

Question 6

During this month, the optic vessels which are —— apart and rotated ——

Answer 6

170•
Anteriorly

Question 7

At birth, what’s the shape of the eyeball

Answer 7

Hemispherical

Question 8

Growth of the eyeball corresponds till what period

Answer 8

Puberty