Which two nerves are involved in the pupillary reaction?

Which two nerves are involved in the pupillary reaction?

The pupillary light reflex pathway involves the optic nerve and the oculomotor nerve and nuclei.

What two cranial nerves are involved in the pupillary reflexes?

Pupillary light reflex is an example of a brainstem reflex. When light is directed toward eye, CN II (Optic – sensory nerve) will carry the input to CN III. Light directed toward either eye will immediately stimulate CN III in both eyes. Thus, both pupils constrict in reponse to light directed into either eye.

What nerves does PLR test?

Further Clinical Evaluation of the optic nerve – The optic nerve is the common part of the afferent pathways involved in the vision and is tested with the menace response, visual placing and pupillary light reflex (PLR). These tests use different integration centres within the brain and different efferent pathways.

Which part of the brain controls pupillary changes?

The hypothalamus

What are the symptoms of weak nervous system?

Signs and symptoms of nervous system disorders

• Persistent or sudden onset of a headache.
• A headache that changes or is different.
• Loss of feeling or tingling.
• Weakness or loss of muscle strength.
• Loss of sight or double vision.
• Memory loss.
• Impaired mental ability.
• Lack of coordination.

Can concussions cause problems later in life?

Long-term effects of concussion are rare. In fact, the vast majority of people see any symptoms resolve within a few weeks. Only about 20 percent of people might suffer from post-concussion syndrome, where they continue to experience symptoms after six weeks.

How does frontal lobe damage affect personality?

As a whole, the frontal lobe is responsible for higher cognitive functions such as memory, emotions, impulse control, problem solving, social interaction, and motor function. Damage to the neurons or tissue of the frontal lobe can lead to personality changes, difficulty concentrating or planning, and impulsivity.

What is the most striking feature of frontal lobe syndrome?

Frontal lobe syndrome is due to a broad array of pathologies ranging from trauma to neurodegenerative diseases. The most important clinical feature is the dramatic change in cognitive function such as executive processing, language, attention, and behavior.

What are some of the first symptoms noticed in frontal lobe dementia?

With FTD, unusual or antisocial behavior as well as loss of speech or language are usually the first symptoms. In later stages, patients develop movement disorders such as unsteadiness, rigidity, slowness, twitches, muscle weakness or difficulty swallowing.

Can frontal lobe damage cause anxiety?

On the other hand, a different part of the frontal lobe, called the ventromedial prefrontal cortex, seems to dampen the signals coming from the amygdala. Patients with damage to this brain region are more likely to experience anxiety, since the brakes on the amygdala have been lifted.

Does frontal lobe damage get worse?

The short answer is yes. Some brain injuries do get worse over time. Secondary brain injuries are complications that arise after the initial injury, such as hematomas or infections. Sometimes these injuries cut off blood circulation to certain portions of the brain, killing neurons.