GENERAL HISTOLOGY

Detailed explanation-1: -Descending tracts are the pathways by which motor signals are sent from the brain to the spinal cord. They are also called motor tracts, due to their involvement in movement coordination. These tracts can be classified by their structural arrangement, into lateral and medial tracts.

Detailed explanation-2: -The ascending tracts carry sensory information from the body, like pain, for example, up the spinal cord to the brain. Descending tracts carry motor information, like instructions to move the arm, from the brain down the spinal cord to the body.

Detailed explanation-3: -Descending motor pathways arise from multiple regions of the brain and send axons down the spinal cord that innervate alpha motor neurons, gamma motor neurons, and interneurons.

Detailed explanation-4: -The white matter of the spinal cord contains a mixture of ascending (sensory or afferent) and descending (motor or efferent) tracts.