Is Nissl bodies a organelle?
The cytoplasm of the motoneurone soma contains several different types of organelle, the most prominent of which is the Nissl body. These bodies range from 0.5 to 3 μm in diameter and electronmicrographs show them to be composed of tightly packed arrays of endoplasmic reticulum.
What are Nissl bodies and their functions?
The functions of Nissl bodies are thought to be the same as those of the rough endoplasmic reticulum in general, primarily the synthesis and segregation of proteins. Similar to the ergastoplasm of glandular cells, Nissl bodies are the main site of protein synthesis in the neuronal cytoplasm.
What are Nissl body composed of?
Subcellular structures found in nerve cell bodies and DENDRITES. They consist of granular endoplasmic reticulum (ENDOPLASMIC RETICULUM, ROUGH) and RIBOSOMES.
What are Nissl’s body?
Medical Definition of Nissl bodies : discrete granular bodies of variable size that occur in the cell body and dendrites but not the axon of neurons, are composed of RNA and polyribosomes, are stained with basic dyes (as methylene blue), and give a striped appearance to the cell.
What is the structure of Schwann cells?
A well-developed Schwann cell is shaped like a rolled-up sheet of paper, with layers of myelin between each coil. The inner layers of the wrapping, which are predominantly membrane material, form the myelin sheath, while the outermost layer of nucleated cytoplasm forms the neurilemma.
What do Schwann cells produce?
Schwann cell, also called neurilemma cell, any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons.
What are Schwann cells and its function?
Function. Schwann cells serve as the myelinating cell of the PNS and support cells of peripheral neurons. A Schwann cell forms a myelin sheath by wrapping its plasma membrane concentrically around the inner axon.