What is a tract?

What is a tract?

• A. collection of axons in the CNS
• B. collection of axons in the PNS
• C. collection of neuron cell bodies in the CNS
• D. collection of dendrites in the CNS

Answer: (A)

A tract is a bundle of axons in the central nervous system that carries information from one region to another. These axons form the brain’s white matter pathways, like the corticospinal or spinothalamic tracts, and are myelinated by oligodendrocytes as they travel within the CNS. This is different from the peripheral nervous system, where a collection of axons is called a nerve. A cluster of neuron cell bodies in the CNS is called a nucleus, not a tract, and dendrites are extensions of neurons rather than bundled pathways. So the correct description is the collection of axons in the CNS.

A tract is a bundle of axons in the central nervous system that carries information from one region to another. These axons form the brain’s white matter pathways, like the corticospinal or spinothalamic tracts, and are myelinated by oligodendrocytes as they travel within the CNS. This is different from the peripheral nervous system, where a collection of axons is called a nerve. A cluster of neuron cell bodies in the CNS is called a nucleus, not a tract, and dendrites are extensions of neurons rather than bundled pathways. So the correct description is the collection of axons in the CNS.