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What is a disadvantage of unmyelinated nervous tissue when compared to myelinated tissue?
Unmyelinated tissue is substantially slower in conducting impulses along the axon. With myelinated axons, the action potential (impulse) jumps from node to node greatly increasing the speed of the impulse.
What makes the matter gray?
Grey matter is nerve tissue that primarily consists of nerve cell bodies, dendrites, and unmyelinated axons, thus having a gray appearance.
What connective tissue cover myelinated or unmyelinated axons?
Axons are covered by connective tissue called endoneurium. Multiple axons are bundled together within fascicles, which are surrounded by perineurium. Finally, the entire nerve is enveloped by epineurium.
What is the difference in transmission between myelinated and unmyelinated fibers?
Impulse transmission on an unmyelinated nerve fiber is much slower than the impulse transmission on a myelinated nerve fiber.
Which nerve fiber do impulses travel slowly?
Unmyelinated nerve fibers conduct impulses more slowly than myelinated nerve fibers. Myelinated nerve fibers have a fatty substance called myelin sheath that allows for faster transmission of impulses compared to unmyelinated fibers without this sheath.
What is the medical term meaning destruction of a nerve?
Neurolysis is destruction of a nerve or nervous tissue. Neuropathy, in contrast, means any disease of a nerve or nerve tissue.
Gray matter in the spinal cord is mostly?
unmyelinated axons.
What is the medical term meaning Inflammation of the fibrous tissue surrounding a nerve?
Myelitis is the medical term meaning inflammation of the fibrous tissue surrounding a nerve. An example is poliomyelitis.
What are the differences between myelinated and unmyelinated nerve fibers in terms of their conduction speed and efficiency?
Myelinated nerve fibers conduct electrical signals faster and more efficiently compared to unmyelinated nerve fibers. This is because the myelin sheath insulates and speeds up the transmission of signals along the nerve fibers.
Are unmyelinated cortical fibers found in the cerebral hemispheres?
Yes, unmyelinated cortical fibers can be found in the cerebral hemispheres. These fibers are a type of nerve cell projection that lack the protective myelin sheath, which is typically found in myelinated fibers. Unmyelinated fibers are involved in transmitting nerve impulses and can be found throughout the brain, including the cerebral hemispheres.
What are masses of nerve tissue called?
Masses of nerve tissue are called ganglia. Ganglia are clusters of nerve cell bodies located outside of the central nervous system.
What is the name of a autoimmune disease characterized by patches of unmyelinated nerve fibers?
multiple sclerosis (MS)
