THE ORBIT - ORBITAL WALLS (normal anatomy)

Question 1

What composes the roof of the orbit?

Answer 1

Orbital Plate of the Frontal Bone

Question 2

Where is the lacrimal gland located?

Answer 2

Lacrimal Fossa (in the anterior lateral aspect of the roof)

Question 3

This completes the roof and is posteriorly located

Answer 3

Lesser Wing of the Sphenoid bone

Question 4

What contains the lesser Wing of the Sphenoid bone?

Answer 4

Optical Canal

Question 5

What separates the lateral wall from the roof?

Answer 5

Superior Orbital Fissure

Question 6

It divides the lesser from the greater wing of the sphenoid bone

Answer 6

Superior Orbital Fissure

Question 7

What forms the anterior portion of the lateral wall

Answer 7

Orbital surface of the zygomatic bone

Question 8

It is known to be the strongest part of the bony orbit

Answer 8

Orbital surface of the zygomatic bone

Question 9

It separates the orbital floor from the lateral wall

Answer 9

Inferior Orbital Fissure

Question 10

It forms the large central area of the floor

Answer 10

Orbital plate of the Maxilla

Question 11

Is the region where blowout fractures most frequently occur

Answer 11

Orbital plate of the Maxilla

Question 12

What completes the inferior orbital rim?

Answer 12

Frontal process of the Maxilla Medially and Zygomatic bone Laterally

Question 13

It forms a small triangular area in the posterior floor

Answer 13

Orbital process of the palatine bone

Question 14

True or False: boundaries of the medial wall are more distinct

Answer 14

False (it is less distinct)

Question 15

True or False: As the ethmoid bone meets the lacrimal bone, it gets thinner

Answer 15

False (ethmoid bone is paper-thin but thickens anteriorly)

Question 16

It forms the most posterior aspect of the medial wall

Answer 16

Body of the sphenoid

Question 17

It forms the upper part of the posterior lacrimal crest

Answer 17

Angular process of the frontal bone

Question 18

What makes the lower portion of the posterior lacrimal crest?

Answer 18

Lacrimal Bone

Question 19

True or False: The anterior lacrimal crest is easily palpated through the lid

Answer 19

True

Question 20

It is composed of the frontal process of the maxilla

Answer 20

Anterior Lacrimal Crest

Question 21

Lies between the two crests and contains the lacrimal sac

Answer 21

Lacrimal Groove