Week 8

Lesion to what cranial nerve would result in ptosis and the loss of the pupillary constriction light reflex to the left eye?

• Right CN 2

• Left CN 2

• Right CN 3

• Left CN 3

Which artery, when compromised, would limit blood supply to the labyrinthine artery?

• basilar artery

• anterior inferior cerebellar artery

• posterior inferior cerebellar artery

• posterior cerebral artery

Which statement best describes the vestibular apparatus?

• There are three semicircular canals, arranged orthogonally to each other.

• There are three semicircular canals, arranged in the sagittal, transverse, and frontal planes.

• There are three labyrinths, the bony, membranous, and endolymph labyrinths

• There are three labyrinths, arranged orthogonally to each other.

What serves as the efferent signal for the pupillary light reflex?

• signals from the pretectal midbrain to ipsilateral iris sphincter muscles

• signals from retinal photoreceptors to the pretectal midbrain region

• signals from retinal photoreceptors to the lateral geniculate nucleus

• signals from the pretectal midbrain to the bilateral iris sphincter muscles

Damage to what part of the visual pathway results in the loss of vision out of the left eye?

• Optic Chiasm

• Left optic nerve

• Right optic nerve

• Right optic tract

• Left optic tract

Which vestibular nuclei send signals to the medial and lateral vestibulospinal tracts?

• inferior and medial

• medial and lateral

• superior and lateral

• superior and medial

What impairment would be due to a partial lesion in the region labeled 4?

• bitemporal hemianopsia

• quadrantopia

• loss of vision from one eye

• homonymous hemianopsia

Which structure primarily detects the movement sensed during lift-off of a rocket ship blasting upwards into space?

• anterior semicircular canal

• horizontal semicircular canal

• saccule

• utricle

Which labeled structure would be significantly impaired by a cranial nerve 4 lesion?

• A

• C

• D

• F

Which best describes somatosensory ataxia?

• Ataxia presenting as incoordination regardless of gravitational forces

• Ataxia presenting as symptoms and functional limitations arising when challenged by gravity

• Ataxia presenting as dysmetria, dysdiadochokinesia, and dysarthria

• Ataxia presenting as the excessive reliance on visual and audio cueing