What is the definition of oligodendrocytes?
What is the definition of oligodendrocytes?
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 the main function of oligodendrocytes?
In the central nervous system (CNS), oligodendrocytes assemble myelin, a multilayered sheath of membrane, spirally wrapped around axonal segments and best known for its role in enabling fast saltatory impulse propagation1,2.
Why is cell body called Perikaryon?
somas), perikaryon (pl. perikarya), neurocyton, or cell body is the bulbous, non-process portion of a neuron or other brain cell type, containing the cell nucleus. Although it is often used to refer to neurons, it can also refer to other cell types as well, including astrocytes, oligodendrocytes, and microglia.
What is a Telodendria?
Telodendria (transmissive) – the terminal branches of an axon; make contact with other neurons at synapses.
How do oligodendrocytes work?
Oligodendrocytes are one of the members of the neuroglial population. In order to do so, the oligodendrocyte extends parts of its membrane to the axon and twists around it thereby forming a wrap of myelin sheaths around each axon. A single oligodendrocyte can extend its processes to 50 axons.
How do you identify oligodendrocytes?
Mature oligodendrocytes are broadly classified into either myelinating or non-myelinating satellite oligodendrocytes. Precursors and both mature types are typically identified by their expression of the transcription factor OLIG2.
Which is called perikaryon?
The cell body of neurons is also called as neurocyton or perikaryon, containing the nucleus. Hence, Cell body of the neuron is called perikaryon.
Which is called cell body or perikaryon?
The region of the neuron containing the nucleus is known as the cell body, soma, or perikaryon (Figure 8.2). The cell body is the metabolic center of the neuron.
What is a Neurolemmocyte?
Schwann cells or neurolemmocytes (named after German physiologist Theodor Schwann) are the principal glia of the peripheral nervous system (PNS). Myelinating Schwann cells wrap around axons of motor and sensory neurons to form the myelin sheath.
What do oligodendrocytes look like?
The cell has a rounded, dark nucleus with clumped chromatin. The cytoplasm is also electron dense and contains short cisternae of rough endoplasmic reticulum with numerous short mitochondria. It is common for these cells to have some dark inclusions in their cytoplasm.
Which is the correct definition of the term perikaryon?
[per′iker′ē·on] Etymology: Gk, peri + karyon, nut. the cytoplasm of a cell body exclusive of the nucleus and any processes, specifically the cell body of a neuron. Also called cyton. perikaryontic, adj.
Which is the best definition of the word integrity?
honor suggests an active or anxious regard for the standards of one’s profession, calling, or position. integrity implies trustworthiness and incorruptibility to a degree that one is incapable of being false to a trust, responsibility, or pledge.
What’s the difference between integrity, honor, and probity?
Choose the Right Synonym for integrity. honesty, honor, integrity, probity mean uprightness of character or action. honesty implies a refusal to lie, steal, or deceive in any way. honor suggests an active or anxious regard for the standards of one’s profession, calling, or position. integrity implies trustworthiness…
Where does the perikaryon break up into branches?
From the base often near its middle arises one large fibre—the axone fibre, which conducts impulses away from the perikaryon. In some few cells the axone breaks up into branches in the immediate neighbourhood of its own perikaryon in the cortex.