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Encyclopedia > Type II sensory fiber

Type II sensory fiber are the second of the two main groups of stretch receptors. They are non-adapting, meaning that they keep responding even when the muscle has stopped changing its length. Stretch receptor are mechanoreceptors responsive to distenstion. ...


Their firing rate is directly related to the muscle's instantaneous length, or position. This information would indicate the position of one's leg once it has stopped moving.


Type I fibers connect to nuclear chain fibers, but not to nuclear bag fibers. These connections are also called "flower spray endings". Brief Outline: There are 3-9 nuclear chain fibres per muscle spindle that are half the size of the nuclear bag fibres. ... Brief Outline: 1-3 nuclear bag fibres lie in the centre of each intrafusal muscle fibre of a muscle spindle. ...


External links

  • http://www.lib.mcg.edu/edu/eshuphysio/program/section8/8ch3/s8ch3_15.htm

  Results from FactBites:
 
Muscle spindle - Wikipedia, the free encyclopedia (546 words)
Primary and secondary sensory fibers spiral around and terminate on the central portions of intrafusal fibers, providing the sensory component of the structure via stretch-sensitive ion-channels of the axons.
When a muscle is stretched, primary sensory fibers (Group Ia afferent neurons) of the muscle spindle respond to both the velocity and the degree of stretch, and send this information to the spinal cord.
This information is transmitted monosynaptically to an alpha efferent motor fiber, which activates extrafusal fibers of the muscle to contract, thereby reducing stretch, and polysynaptically through an interneuron to another alpha motoneuron, which inhibits contraction in opposing muscles.
Chapter 4b - Sensory Receptors II (3118 words)
Both types of receptors have an inner segment, consisting of the cell body and efferent process, and an outer segment, connected to the inner segment by a cilium and consisting mainly of layers of folded membrane (Fig.
We have seen that generator or receptor potentials in all types of receptors except those in the eye are hypopolarizing.
Suppose that these mainly defenseless fish-like creatures developed a type of cell (a receptor) that contained a photopigment and was capable of secreting a substance (let’s call it a hormone) that could cause the animal to begin swimming.
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