EVERYDAY SCIENCE

Detailed explanation-1: -Macroglia. Derived from ectodermal tissue. The most abundant type of macroglial cell in the CNS, astrocytes (also called astroglia) have numerous projections that link neurons to their blood supply while forming the blood–brain barrier.

Detailed explanation-2: -One cell providing support to neurons of the CNS is the astrocyte, so named because it appears to be star-shaped under the microscope (astro-= “star”). Astrocytes have many processes extending from their main cell body (not axons or dendrites like neurons, just cell extensions).

Detailed explanation-3: -Astrocytes: These cells fill the spaces between neurons and provide for structural integrity. They also have processes that join to the capillary blood vessels.

Detailed explanation-4: -Astrocytes are star-shaped cells that are commonly found between neurons and blood vessels, where they provide support and hold structures together. They aid in metabolism and help regulate concentrations of ions such as potassium. Astrocytes communicate with one another and other neuroglial cells.

Detailed explanation-5: -Astrocytes, shown in Figure 16.8a make contact with both capillaries and neurons in the CNS. They provide nutrients and other substances to neurons, regulate the concentrations of ions and chemicals in the extracellular fluid, and provide structural support for synapses.