Answer to Question #193590 in Human Anatomy and Physiology for And

Question

Good day,Is this statement True or False?

Descending pathways that inhibit pain stimulate inckude the periaqueductal gray nucleus.

Answer 1

The above statement is true

Explanation

Descending pathways can be defined as a group of myelinated nerve fibres which contain motor information from the brain to the effector muscle and spinal cord. They are divided into two groups are given below:

• Pyramidal tract: this tract control the voluntary muscular movement in the body and consist of two distinct pathway are distinct and corticobulbar tract.
• extrapyramidal tract: this tract originate from the brain and carries the motor fibres to the spinal cord and responsible for involuntary and automatic control of muscle

In descending pathway, the circuit contains the periaqueductal grey matter in the upper brain stem. Descending pain suppression occurs by locus coeruleus, nucleus raphe magnus and nucleus reticularis gigantocellularies which inhibit the pain information signal to the spinal cord. These receptors normal target site for the neurotransmitter and endogenous opiates like endorphins and enkephenkephalins which results in the binding of the receptor at subcortical sites and changes the electrophysiological properties of neurons.