Orbital Anatomy

Question 1

Average dimensions of adult orbit?
1. volume
2-3. entrance height and width
4. medial wall length
5. distance from posterior globe to optic foramen
6. length of orbital segment of ON
7. distance between medial walls

Answer 1

1. 30 cc
2. 35 mm
3. 40-45 mm
4. 40-45 mm
5. 18 mm
6. 25-30 mm
7. 25 mm

Question 2

What bones compose the orbital roof?

Answer 2

orbital plate of frontal bone and lesser wing of sphenoid

Question 3

Location of fossa for trochlea and SO tendon?

Answer 3

5 mm behind the superior nasal orbital rim

Question 4

What passes through supraorbital notch/foramen?

Answer 4

supraorbital artery and vein, supraorbital branch of frontal nerve

Question 5

What bones compose the lateral orbital wall?

Answer 5

zygomatic bone and greater wing of sphenoid

Question 6

Attachments to lateral orbital tubercle of Whitnall?

Answer 6

Lateral canthal tendon, lateral horn of levator aponeurosis, check ligament of lateral rectus, Lockwood ligament (suspensory ligament of globe), and Whitnall ligament.