Anatomy of the Optic Nerve Head Quiz

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What is the staining characteristic of the nonmyelinated axons in the optic nerve head?

They are only stained by Luxol fast blue at high magnification

They are intensely stained by Luxol fast blue

They are not stained by Luxol fast blue (correct)

They are weakly stained by Luxol fast blue

Which of the following tissues separates the optic nerve fibers from the retinal layers?

Intermediary tissue of Kuhnt (correct)

Lamina cribrosa

Marginal tissue of Elsching

Border tissue of Jacoby

What is the location of the marginal tissue of Elsching?

Behind the lamina cribrosa

Inner to the glial sheets

Outer to the glial sheets (correct)

Within the physiologic cup

What is the purpose of the central meniscus of Kuhnt?

Not mentioned in the text Signup and view all the answers

What is the composition of the spur of collagenous tissue?

Collagenous tissue of scleral derivation Signup and view all the answers

What is the function of the astroglial membrane?

Not mentioned in the text Signup and view all the answers

What is the significance of the dotted lines in Figure 40.32?

They represent the borders of the lamina cribrosa Signup and view all the answers

What is the relationship between the optic nerve fibers and the connective tissue septa?

The connective tissue septa are from the pia mater Signup and view all the answers

What structure separates the nerve fascicles and their surrounding astrocytes at the lamina cribrosa?

Cribriform plate Signup and view all the answers

What is the main component of the septal tissue?

Pial mater Signup and view all the answers

At which point do the nerve fibers become myelinated?

At the lamina cribrosa Signup and view all the answers

What structure sends connective tissue to the anterior part of the lamina?

External choroid Signup and view all the answers

What type of glial cell is present within the nerve fascicles?

Oligodendrocytes Signup and view all the answers

What is the function of the astrocytes in the retina?

To segregate the nerve fibers into bundles Signup and view all the answers

What is the name of the glial lining continuous with the intermediary tissue of Kuhnt?

Mantle of astrocytes Signup and view all the answers

What is the name of the structure where the nerve fibers terminate?

Optic disc Signup and view all the answers

What is the shape of the optic chiasm?

Rectangular Signup and view all the answers

Which nerve fibers connect the optic chiasm to the lateral geniculate visual nuclei?

A combination of magnocellular, contralateral parvicellular, and ipsilateral parvicellular fibers Signup and view all the answers

What is the function of the lateral geniculate nucleus?

To regulate the flow of visual information and ensure it is sent to the visual cortex Signup and view all the answers

Which part of the visual cortex is equivalent to Brodmann area 17?

Striate cortex Signup and view all the answers

What is the name of the tract that nerve fibers from the LGN form as they leave the LGN?

Optic radiations Signup and view all the answers

Which artery supplies the outer retinal layers?

Choroid Signup and view all the answers

What is the name of the network that supplies the superior part of the optic chiasm?

Superior network Signup and view all the answers

Which artery supplies the optic tract?

Anterior choroidal artery Signup and view all the answers

Which artery supplies the middle radiations in the visual pathway?

Middle cerebral artery Signup and view all the answers

What is the functional significance of the visual field?

It is the entire visible area an eye can detect around a point of regard. Signup and view all the answers

Which structure receives fibers from the temporal retina?

Temporal side of the optic disc Signup and view all the answers

What is the pattern of fibers from the nasal retina in the optic disc?

They radiate directly to the nasal side Signup and view all the answers

Which part of the retina gives rise to the papillomacular bundle?

Macula Signup and view all the answers

Which artery supplies the striate cortex?

Posterior cerebral artery Signup and view all the answers

What happens to the nasal fibers in the optic chiasm?

They decussate Signup and view all the answers

What is the arrangement of axons in the nerve fiber layer of the retina?

Three basic patterns Signup and view all the answers

In the optic chiasm, where do inferior peripheral nasal fibers cross?

In the inferoanterior part of the chiasm Signup and view all the answers

What is the name of the loop formed by the superior peripheral nasal fibers in the optic tract?

Posterior knee of von Willebrand Signup and view all the answers

In the optic tract, which fibers occupy the lateral area?

Contralateral inferior nasal retinal fibers Signup and view all the answers

In the lateral geniculate nucleus, which layers receive contralateral nasal retinal fibers?

Layers 1, 4, and 6 Signup and view all the answers

Which fibers follow an indirect route to the occipital lobe through the temporal lobe?

Fibers from the inferior retina Signup and view all the answers

Where do the inferior radiations terminate in the striate cortex?

Lingual gyrus Signup and view all the answers

Which part of the striate cortex receives projections from the macular area?

Superior macular in the cuneus gyrus and inferior macular in the lingual gyrus Signup and view all the answers

Which side of the brain receives sensory input from the left side of the visual environment?

Right side of the brain Signup and view all the answers