What is the function of the pupillary light reflex quizlet?

The pupillary light reflexes function to protect the retina (part of the CNS) from damage resulting from excessively bright light.

What happens during the pupillary light reflex?

A greater intensity of light causes the pupil to constrict (miosis/myosis; thereby allowing less light in), whereas a lower intensity of light causes the pupil to dilate (mydriasis, expansion; thereby allowing more light in). Thus, the pupillary light reflex regulates the intensity of light entering the eye.

What is the specific effector in the pupillary accommodation reflex What is the purpose of this reflex?

What is the receptor and effector in the pupillary reflex? The retina is the receptor and the effector is the smooth muscle of the iris. They both work together to restrict or enlarge the pupil according to how bright the light it. when a person is looking as a far object the pupil is enlarged.

What kind of reflex is pupillary light reflex?

Pupillary reflexes involve the autonomic (Edinger-Westphal) component of the oculomotor nucleus. In the light reflex, the pupils constrict when light is shone on the retina. If one eye only is stimulated, both pupils constrict, the so-called consensual reflex.

What is a pupillary reflex quizlet?

pupillary light reflex. the reduction of pupil size in response to light.

Is pupillary light reflex cranial or spinal?

Similar reflex arcs exist between cranial nerves with sensory and motor function. Because most of the cranial nerves are arranged along the brainstem, these reflex arcs are referred to as “brainstem reflexes”. Pupillary light reflex is an example of a brainstem reflex.

What are the five basic components of the pupillary light reflex pathway?

It consists of a pupillary accommodation reflex, lens accommodation reflex, and convergence reflex. Afferent pathway for pupillary constriction, lens accommodation, and convergence: Afferent input from the retina is sent to the lateral geniculate nucleus via the optic tract.

Is the pupillary light reflex sympathetic or parasympathetic?

Pupil dilation is mediated by a sympathetic output acting in opposition to parasympathetically mediated pupil constriction. While light stimulates the parasympathetic output, giving rise to the light reflex, it can both inhibit and stimulate the sympathetic output.

What was the response of the pupil when light was shone on it quizlet?

The patient’s pupils are fixed and dilated in response to light. Both pupils dilate in response to light.

What is the category of pupillary reflex quizlet?

The pupillary light reflex is an example of a(n) Autonomic reflex.

Is pupillary light reflex somatic or autonomic?

Autonomic Reflexes- The autonomic reflexes include the pupillary reflexes as well as many others.

Is the pupillary light reflex a somatic or autonomic reflex?

Autonomic Reflexes- The autonomic reflexes include the pupillary reflexes as well as many others. 1. Pupillary Reflexes- There are several types of pupillary reflexes- the pupillary light reflex and the consensual reflex.

Why are the pupillary light reflex and the corneal reflex important?

The Pupillary Light Reflex and the Corneal Reflex (or Blink Reflex) are two important reflexes because the Light Reflex prevents damage to eye compopents related to over exposure to light and also helps the eye to accommodate visually, when there is less light; The Blink Reflex prevents objects from entering the eye and lubricates the eye.

What is the function of the pupil in the eye?

The pupil is able to adjust to light in the surroundings, allowing us to see in both light and dark environments. The pupillary light reflex is the reflex that controls the diameter of the pupil when it is exposed to varying intensities of light.

What is the difference between left direct and left consensual pupillary reflex?

Left direct pupillary reflex is the left pupil’s response to light entering the left eye. Left consensual pupillary reflex is the left pupil’s indirect response to light entering the right eye, the contralateral eye.

What causes the pupillary reflex to stop working?

Lack of the pupillary reflex or an abnormal pupillary reflex can be caused by optic nerve damage, oculomotor nerve damage, brain stem death and depressant drugs, such as barbiturates. Normally, both pupils should constrict with light shone into either eye alone.