Visual Pathways

A map of the visual field is represented by the...

Retina and Brain

The visual field is mapped in the...

Visual Cortex

The visual cortex is in the...

Posterior Cortex

Signals from the retinal ganglion axons travels to where before going to the visual cortex?

Lateral Geniculate Nucleus

Animals with what type of eyes have a higher frequency of decussation at the optic chiasm?

Laterally Placed Eyes

1 multiple choice option

Which animal has a 100% of optic axons decussate at the optic chiasm?

Fish

A lesion in the left brain will result in (right/left) visual field impairment.

Right

1 multiple choice option

A lesion in the right brain will result in (right/left) visual field impairment.

Left

1 multiple choice option

Place these animals in order of highest to lowest frequency of decussation at the optic chiasm: Pig, Primate, Dog, Cat.

Pig -> Dog -> Cat -> Primate

3 multiple choice options

Which animal's visual pathway decussates twice?

Owl

T/F: Shining a light in one eye causes pupillary constriction in both eyes

True

1 multiple choice option

What is the visual pathway for the menace response of the left eye?

Signal from left retina -> Right Lateral Geniculate Nucleus -> Motor Cortex -> Right Pontine Nucleus -> Middle Cerebellar Peduncle -> Left Cerebellar Cortex -> Left CN VII Motor Nucleus -> CN VII

Where along the visual pathway of the menace response does decussation occur?

-Optic Nerve

-Pons to Cerebellum

T/F: The menace response emerges postnatally.

True

1 multiple choice option

Which animal's menace response develops sooner? Horse or Dog

Horse

1 multiple choice option

What is associated with early development of the menace response?

Early Socialization

If the parasympathetic system is compromised, what condition of the eye occurs?

Mydriasis

If the sympathetic system is compromised, what condition of the eye occurs?

Miosis (Horner's Syndrome)

T/F: The PLR elicits a direct and indirect response.

True

1 multiple choice option

What is the visual pathway for the PLR of the right eye?

Right Retina -> Optic Chiasm -> Left Pretectal Nuclei -> Right PN3 -> Right Constrictor Muscle