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A nerve fiber is a threadlike extension of a nerve cell and consists of an axon andmyelin sheath (if present) in the nervous system. There are nerve fibers in the central nervous system and
peripheral nervous system. A nerve fiber may be myelinated and/or unmyelinated. In the central nervous system (CNS), myelin is produced byoligodendroglia cells. Schwann cells form myelin in the peripheral nervous system (PNS). Schwann cells can also make a thin covering for an axon which does not consist of myelin (in the PNS). A peripheral nerve fiber consists of an axon, myelin sheath, Schwann cells and its endoneurium. There are no endoneurium and Schwann cells in the central nervous system.
A myocyte (also known as a muscle cell or muscle fiber)
[1] is the type of cell found inmuscle tissue. They are long, tubular cells that arise developmentally from myoblasts to form muscles in a process known as myogenesis.
[2] There are various specialized forms of myocytes: cardiac, skeletal, and smooth muscle cells, with various properties. Cardiac myocytes are responsible for generating the electrical impulses that control the heart rate, among other things
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List three reasons why the connective tissue wrapping of skeletal muscles are important?
1. Provide a route for entry and exit of nerves and blood vessels that serve the muscle fibers. 2. Provide strength to muscle as a whole3. Support and bind muscle fibers
At what junction do nerves contact skeletal muscle fibers?
Motor neurons meet the muscle cells at neuromuscular junctions. Neurotransmitters are passed from the nerve across a synaptic cleft to the muscle to make it contract. Any damage to this nerve will mean that those cells will not contract (move).
Does epimysium contain nerves and blood vessels?
Yes, the connective tissues of the epimysium contain the blood vessels and nerves that supply the muscle fibers
What type of muscle fibers are there?
You have three types of muscle fibers. 1) Skeletal muscle fibers. 2) Cardiac muscle fibers. 3) Smooth muscle fibers.
What types of fibers are there?
You have three types of muscle fibers. 1) Skeletal muscle fibers. 2) Cardiac muscle fibers. 3) Smooth muscle fibers.
What types of muscle are there?
You have three types of muscle fibers. 1) Skeletal muscle fibers. 2) Cardiac muscle fibers. 3) Smooth muscle fibers.
What kind of nerves control skeletal muscle contraction?
The muscle spindle helps to control the contraction of muscles. It is a special sensory organ that uses sensory neuronal fibers to find how long the intrafusal muscle fibers are.
Why do muscle fibers need to be wrapped and bundled into groups?
So that nerves can send a signal to the bundle instead of each individual fiber.
What is the cardioacceleratory center?
innervates SA and AV nodes, heart muscle, and coranary arteries through parasympathetic fibers in the vagus nerves
What is the psoas nerve?
The psoas nerve is the nerve that innervates the psoas major muscle. It is formed by fibers of spinal nerves L2-L4.
What is the term for nerves carrying both sensory and motor fibers?
Nerves carrying both sensory and motor fibers are called sensorimotor nerves.
What nerve carries only sensory fibers?
nerves carrying just sensory fibers are referred to as sensory and or what nerves?
