Question

When you move your eyes up and down at high speed, those movements are initiated by neurons in the _________. However, high speed side-to-side movements are due to neurons in the pons and medulla.

A.) pons

B.) parotid gland

C.) central ganglia

D.) midbrain

The neurons of the retina that sense light include: (choose all that apply)

A.) Rods

B.) Amacrine cells

C.) Cones

D.) Bipolar cells

E.) Optic nerve cells

Answer 1

The neurons of the retina that sense light include :

Rods: Photoreceptors that detect black, white, and gray and that detect movement. Rods are necessary for peripheral and dim-light vision when cones do not respond. Distributed throughout the retina, except none are in the fovea.

Cones: Photoreceptors that detect color and fine detail in daylight or in bright-light conditions. Most concentrated at the fovea of the retina; none are in the periphery.

Bipolar cells: Second layer of neurons in the retina that transmit impulses from rods and cones to ganglion cells.

Amacrine cells are inhibitory neurons and project their dendritic arbors to the inner plexiform layer (IPL), there interacting with retinal ganglion cells and/or bipolar cells.

Optic nerve: nerve responsible for carrying impulses for the sense of sight from the retina to the brain