What is white matter? White matter is composed of bundles of myelinated axons, which connect various gray matter areas of the brain to each other, and carry nerve impulses between neurons.
What makes up the white matter in the central nervous system?
The white matter of your brain and spinal cord is composed of bundles of axons. These axons are coated with myelin, a mixture of proteins and lipids, that helps conduct nerve signals and protect the axons.
What is the composition of white matter in the central nervous system quizlet?
The white matter composed of myelinated and unmyelinated axons.
What makes up the gray and the white matter in the central nervous system?
The central nervous system is made up of tissue known as grey matter and white matter. … Grey matter also contains unmyelinated axons. White matter on the other hand is mainly composed of long-range myelinated axons, which transmit signals to the grey matter, and only very few neuronal cell bodies.
What makes up white matter?
White matter is found in the deeper tissues of the brain (subcortical). It contains nerve fibers (axons), which are extensions of nerve cells (neurons). Many of these nerve fibers are surrounded by a type of sheath or covering called myelin. Myelin gives the white matter its color.
What are white matter tracts in the brain?
White matter refers to areas of the central nervous system (CNS) that are mainly made up of myelinated axons, also called tracts. … However, the tissue of the freshly cut brain appears pinkish-white to the naked eye because myelin is composed largely of lipid tissue veined with capillaries.
What forms the white matter of the spinal cord quizlet?
The white matter of the spinal cord is composed of myelinated and nonmyelinated nerve fibers that allow communication between different parts of the spinal cord and between the cord and brain.
What makes the white matter of the spinal cord appear white quizlet?
Myelin is a fatty substance that covers some axons. It appears white under a microscope and is often referred to as white matter.
What is white matter and what role does it play in the brain quizlet?
White matter in brain is known as the cerebral white matter. The white matter deep to the cortical gray matter is responsible for communication between cerebral areas and between the cerebral cortex and lower CNS.
What is white matter and gray matter?
Grey matter is distinguished from white matter in that it contains numerous cell bodies and relatively few myelinated axons, while white matter contains relatively few cell bodies and is composed chiefly of long-range myelinated axons. The colour difference arises mainly from the whiteness of myelin.
What is white matter called?
Overview. The tissue called “gray matter” in the brain and spinal cord is also known as substantia grisea, and is made up of cell bodies. “White matter”, or substantia alba, is composed of nerve fibers.
Why is white matter on the outside of the spinal cord?
The type of fat in myelin makes it look white, so myelin-dense white matter takes on a white hue as well. … The spinal cord, which transmits nerve impulses to and from the rest of the body, has the opposite arrangement: gray matter at its core with insulating white matter on the outside.