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Larger diameters are typical of invertebrates and are nonmylenated
Invertebrates
Cuttlefish (Sepia sp.) 200 micron Large central fibers
Squid (Loligo sp.) 400 micron Large central fibers
(Both used in early nerve research)
Crab 100 to 250 micron Central fiber
Lobster 60 to 90 micron Leg axons
Earthworms 40 to 90 micron
Cockroach 50 micron Central fiber
Vertebrates
Carp 20 micron Lateral neuron
Human 10 to 20 micron Mylenated - to/from skeletal muscle
0.3 to 1.3 Nonmylenated - deep pain
Data from Rainer Flindt, Amazing Numbers in Biology,2003. (More specific citations within.)
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Can a myelinated axon have a larger diameter than an unmyelinated axon?
Yes, a myelinated axon can have a larger diameter than an unmyelinated axon. Myelin sheath covers the axon, and the diameter of the axon itself can vary independently of myelination. The larger diameter of a myelinated axon allows for faster conduction of nerve impulses compared to unmyelinated axons.
What is the relationship between the diameter of axon and conduction velocity?
There is a positive relationship between the diameter of an axon and its conduction velocity. Larger axon diameters result in faster conduction velocities due to decreased resistance to ion flow. This relationship is described by the principle of "the larger the diameter, the faster the conduction."
Do small unmyelinated axon travel signal faster than large unmyelinated axon?
no
What part of the neuron carries impulses away from the neuron?
Axons send information away from a cell body.
The longest part of a motor neuron is likely to be the?
axon, which is the elongated fiber that transmits electrical impulses away from the cell body to other neurons or muscle cells. The axon can extend a great distance from the cell body to reach its target, such as a muscle fiber.
Is and axon bulb and an axon hillock the same thing?
axon hillock = where cell body meets the axon axon bulb = end of the axon...lies very close to the dendrites of another neuron so impulses can pass over the synapse. AP Biology student *
The axon is made up of?
what is the axon made of
The axon is connected to the soma by the?
axon hillock
What is a axon hillock?
An axon hillock is a special cell body that connects an axon to a neuron. It is the last place where propagated membrane potentials are transmitted to the axon.
What does not belong axon terminal synaptic knob bouton axon collateral?
Bouton does not belong as it refers to a swollen region along an axon where synapses are found, while axon terminal, synaptic knob, and axon collateral are all parts of the structure of a neuron.
What synapses release acetylcholine?
sympathetic preganglionic axon parasympathetic preganglionic axon parasympathetic postganglionic axon
Why was the squid axon particularly appropriate for nerve research?
The squid axon is the largest axon known in the whole animal kingdom, the axon of the squid is also very much like humans and most mammal axon, thus making is an ideal axon to use during research
