Neuro Final - Exam 3 Review

Front 1

What is the derivative of the otic vesicle?

Back 1

Membranous labyrinth: Semicircular ducts, Utricle, Saccule, Cochlear ducts

Front 2

The mesenchyme surrounding the membranous labyrinth (otic capsule) forms what structure(s)?

Back 2

Bony labyrinth: Semicircular canals, cochlea, vestibule

Front 3

What is the embryological origin of the middle ear?

Back 3

First pharyngeal pouch; Ossicles from the 1st and 2nd pharyngeal arches

Front 4

What is the embryological origin of the external ear?

Back 4

First pharyngeal groove or cleft

Front 5

What is the cause of neurosensory deafness?

Back 5

1. Abnormal development of cochlea, CN VIII, or brain stem
2. Rubella in 1st trimester can damage Organ of Corti

Front 6

What is the cause of conduction deafness?

Back 6

Persistance of meatal plug (as seen in 1st Arch Syndrome); Fixation of footplate of stapes

Front 7

Describe the visual pathway

Back 7

Retina --> Optic Nerve, Chiasm, Tract --> Lateral geniculate nucleus of thalamus --> Geniculocalcarine tract (optic radiation) --> Visual cortex (Area 17)

Front 8

Describe the Marcus Gunn pupil

Back 8

Lesion of CNII -- leads to decreased response of pupil to light in the affected eye

Front 9

Describe the Argyll Robertson pupil

Back 9

The pupil accommodates to near objects but does not react to light

Front 10

The visual association cortex has projections to where?

Back 10

Superior colliculus via optic radiation and brachium of superior colliculus for AUTO SCANNING and ACCOM/CONVERGE reflexes

Front 11

Which axons of the optic nerve cross in the optic chiasm?

Back 11

Temporal fields

Front 12

The areas at the sides of the visual field are the temporal monocular crescents of the visual field. They are seen by what part of the eye?

Back 12

The nasal portion of the retina

Front 13

What are the retinal cell types in the macula?

Back 13

Cones ONLY