Question

white matter of the spinal cord
white matter of the spinal cord is composed of myelinated fiber tracts—some running to higher centers, some traveling from the brain to the cord, and some conducting (1 ) from one side of the spinal cord to the other (figure 7 21, p. 256).
because of the irregular shape of gray matter, the (2 ) matter on each side of the cord is divided into three regions—the dorsal column, lateral column, and ventral column. each of the columns contains a number of fiber tracts made up of (3 ) with the same destination and function. tracts conducting sensory impulses to the brain are sensory, or afferent, tracts. those carrying impulses from the brain to skeletal muscles are (4 ), or efferent, tracts. all tracts in the dorsal columns are ascending tracts that carry sensory input to the brain. the lateral and ventral columns contain both (5 ) and descending (motor) tracts.

o 1. impulses 2. white 3. axons 4. motor 5. ascending

o 1. axons 2. motor 3. ascending 4. impulses 5. white

o 1. white 2. axons 3. motor 4. ascending 5. impulses

o 1. ascending 2. impulses 3. white 4. axons 5. motor

o 1. motor 2. ascending 3. impulses 4. white 5. axons

Explanation:

The white matter of the spinal cord has myelinated fiber - tracts that conduct impulses. It is divided into regions and contains fiber tracts made of axons. Tracts carrying impulses from the brain to skeletal muscles are motor (efferent) tracts, and the white matter columns contain ascending and descending tracts.

Answer:

1. impulses 2. white 3. axons 4. motor 5. ascending