Ocular Anatomy - optic nerve

Question 1

what makes up the posterior pole

Answer 1

optic nerve
blood vessels
macula

Question 2

the intraocular optic nerve occupies the

Answer 2

posterior scleral foramen

Question 3

length of ION and diameter

Answer 3

length = 1 mm
diameter = 1.5 mm

Question 4

what is the shortest component of the ON

Answer 4

intraocular optic nerve

Question 5

ION contains 1.2 million axons which pass through the

Answer 5

lamina cribrosa

Question 6

axons are grouped into fascicles and supported by

Answer 6

astrocytes (neuroglia = supportive in nature)

Question 7

ION is the site of entry and exit of

Answer 7

blood vessels (part of CRA and CRV)

Question 8

does the ION contain myelinated or unmyelinated axons of ganglion cells

Answer 8

unmyelinated axons of ganglion cells = nerve fiber layer

Question 9

what cell myelinates in CNS?

Answer 9

oligodendrocytes

Question 10

what keeps myelinated cells out of the retina?

Answer 10

lamina cribrosa