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17 Cards in this Set
- Front
- Back
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What are neurolemmocytes |
also known as schwan cells |
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How will neurolemmocytes appear on a micrograph? |
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Where can a schwann cell lay in relationship to a nerve? when does each occur? |
It can either gunlf a cell completely or just simply lay to the side. When a cell is unmyelinated schwann cells will do this |
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When you see a nucleus around a nerve cell what is it from |
Schwann cell |
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What is a satellite cell? |
It is going to surround a ganglia in a concentric circle |
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How are nerves bundled together |
hey are composed of bundles of axons and Schwann cells embedded in a connective tissue matrix |
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How are unmyelinated axons protected? |
1. Neurolmmocyte starts to enveop multiple axons
2. The unmyelinated axons are enveloped by the neurolemmocyte but ther are no myelin sheath wraps around each axon |
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What are the layers of a mylenated axon? |
Axon, layer of myelin, endoneurium surrounds individual nerve fibers and is kind of what forms the solid, schwann cell lays on top, Perineuirum encloses a fascicle, Epineurium encloses multple fascials to form nerve |
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What are the types of ganglia and what are their functions |
1. Dorsal root ganglia of the spinal cord and ganglia of spinal nerves
2. Receive different afferent impulses from environment 3. Transmit effector impusles to muscles an glands from CNS motor ganglia |
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What are the appearance of sensory ganglia? |
You have ganglion cells in perpherary and nerve fiber is centralized |
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What is the appearance of autonomic ganglia? |
1. Large ovidic eccentric nuclei
2. Less numerous satellite celsl, not forming continuous layer |
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What do PNS ganglia have? |
Sattellite cells that form a ring around a ganglion cells |
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What composes myelin? What is its function? |
1. omposed of lipoprotein material dervived from Schwann cells in PNS wrapping and fusing around axons
2. Insulates and protects long axons and speed up nerve conduction |
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What does a node of ranvier look like on a micrograph |
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how does the process of myelination occur
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1. Neurolemmocyte starts to wrap around a portion of an axon
2. Neurolemmocyte cytoplasm and plasma membrane begin to form consecutive layers around axon 3. The lover lappy pwarst of the neurolemmocyte pm form the myelin sheath 4. Eventually the neurolemmocyte cytoplasm and nucleus are pushed to the periphery of cell as myelin sheath is formed 5. LIKE MAKING A JELLY ROLL |
