CNS. Microglia are responsible for immune surveillance and phagocytosis in the CNS. Ependymal cells line the ventricular system and produce cerebrospinal fluid. White and Grey Matt... CNS. Microglia are responsible for immune surveillance and phagocytosis in the CNS. Ependymal cells line the ventricular system and produce cerebrospinal fluid. White and Grey Matter Distribution The CNS can be divided into white and grey matter based on appearance. Key points include: White matter consists mainly of myelinated axons and appears white due to the presence of myelin. Grey matter consists mainly of neuronal cell bodies and appears grey due to the absence of myelin. White matter is found primarily in the interior of the brain and spinal cord, while grey matter is found on the surface. Ascending and Descending Tracts Nerve tracts can be classified as either ascending or descending based on the direction of information flow. Key points include: Ascending tracts transmit sensory information from the body to the brain. Descending tracts transmit motor information from the brain to the body. Examples of ascending tracts include the spinothalamic tract (pain and temperature sensation) and the dorsal column-medial lemniscal tract (touch and vibration sensation). Examples of descending tracts include the corticospinal tract (motor control) and the vestibulospinal tract (balance and posture).
Understand the Problem
The text provides an overview of the central nervous system (CNS), detailing the functions of microglia and ependymal cells, the distribution of white and grey matter, and the classification of nerve tracts into ascending and descending. It summarizes key characteristics and examples related to these topics.
Answer
Microglia: immune surveillance; Ependymal cells: produce cerebrospinal fluid; White matter: myelinated axons; Grey matter: neuronal cell bodies.
Microglia are responsible for immune surveillance and phagocytosis in the CNS, while ependymal cells line the ventricular system and produce cerebrospinal fluid. White matter consists mainly of myelinated axons, and grey matter consists mainly of neuronal cell bodies.
Answer for screen readers
Microglia are responsible for immune surveillance and phagocytosis in the CNS, while ependymal cells line the ventricular system and produce cerebrospinal fluid. White matter consists mainly of myelinated axons, and grey matter consists mainly of neuronal cell bodies.
More Information
Microglia are derived from myeloid progenitor cells of the yolk sac and serve as the primary immune effector cells in the CNS, similar to macrophages in the peripheral nervous system.
Sources
- Microglia - Wikipedia - en.wikipedia.org
- Glial Cells - an overview | ScienceDirect Topics - sciencedirect.com
- Microglia Function in the Central Nervous System During Health and ... - ncbi.nlm.nih.gov
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