Where are these astrocytes found?
Astrocytes are star-shaped cells found in the brain. Similarly to other neuronal cells, astrocytes are comprised of synapses, or cell ends that allow for chemical and electrical communication between cells.
Where are microglia found?
Microglia are a type of neuroglia (glial cell) located throughout the brain and spinal cord. Microglia account for 10–15% of all cells found within the brain. As the resident macrophage cells, they act as the first and main form of active immune defense in the central nervous system (CNS).
What is the oligodendrocyte function?
Oligodendrocytes are the myelinating glia of the central nervous system. Myelination of axons allows rapid saltatory conduction of nerve impulses and contributes to axonal integrity.
What is a astrocyte anatomy?
astrocyte, star-shaped cell that is a type of neuroglia found in the nervous system in both invertebrates and vertebrates. Astrocytes can be subdivided into fibrous and protoplasmic types. Fibrous astrocytes are prevalent among myelinated nerve fibres in the white matter of the central nervous system.
What is Pericyte?
Abstract. Pericytes, spatially isolated contractile cells on capillaries, have been reported to control cerebral blood flow physiologically, and to limit blood flow after ischaemia by constricting capillaries and then dying.
Do Microglias come monocytes?
Microglia arise predominantly from YS-derived macrophages (Fig. 1) (Ginhoux et al. 2010; Kierdorf et al. 2013a), whereas Langerhans cells originate mainly from FL-derived monocytes, but retain a detectable YS-derived macrophage (MF) component (Hoeffel et al.
What Microglias look like?
Microglia nuclei are typically oval-shaped, and projecting out from their cell bodies are slender elongated processes that enable the cells to move via chemotaxis (movement along a chemical gradient). The embryonic origin of microglia is distinct from other types of neuroglia.
What is oligodendrocyte made of?
Oligodendrocytes are the myelinating cells of the central nervous system (CNS). They are the end product of a cell lineage which has to undergo a complex and precisely timed program of proliferation, migration, differentiation, and myelination to finally produce the insulating sheath of axons.
What is Endoneurial?
Endoneurium is the intrafascicular connective tissue. It is composed of several nerve fibers making up a primary fascicle. The endoneurial tube is a distensible elastic structure composed of a dense matrix of collagen tissue, which has a nutritive and protective function.
Do astrocytes produce cerebrospinal fluid?
Astrocytes also form the blood-brain barrier—a structure that blocks entrance of toxic substances into the brain. They are involved in the production of cerebrospinal fluid, which serves as a cushion for the brain, moves the fluid between the spinal cord and the brain, and is a component of the choroid plexus.
What are fibrous astrocytes?
Fibrous astrocytes are prevalent among myelinated nerve fibres in the white matter of the central nervous system. Organelles seen in the somata of neurons also are seen in astrocytes, but they appear to be much sparser. These cells are characterized by the presence of numerous fibrils in their cytoplasm.