Global Information Lookup Global Information

Muscle spindle information


Muscle spindle
Mammalian muscle spindle showing typical position in a muscle (left), neuronal connections in spinal cord (middle) and expanded schematic (right). The spindle is a stretch receptor with its own motor supply consisting of several intrafusal muscle fibres. The sensory endings of a primary (group Ia) afferent and a secondary (group II) afferent coil around the non-contractile central portions of the intrafusal fibres. Gamma motor neurons activate the intrafusal muscle fibres, changing the resting firing rate and stretch-sensitivity of the afferents. [a]
Details
Part ofMuscle
SystemMusculoskeletal
Identifiers
Latinfusus neuromuscularis
MeSHD009470
THH3.11.06.0.00018
FMA83607
Anatomical terminology
[edit on Wikidata]

Muscle spindles are stretch receptors within the body of a skeletal muscle that primarily detect changes in the length of the muscle. They convey length information to the central nervous system via afferent nerve fibers. This information can be processed by the brain as proprioception. The responses of muscle spindles to changes in length also play an important role in regulating the contraction of muscles, for example, by activating motor neurons via the stretch reflex to resist muscle stretch.

The muscle spindle has both sensory and motor components.

  • Sensory information conveyed by primary type Ia sensory fibers which spiral around muscle fibres within the spindle, and secondary type II sensory fibers
  • Activation of muscle fibres within the spindle by up to a dozen gamma motor neurons and to a lesser extent by one or two beta motor neurons[citation needed]


Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

and 28 Related for: Muscle spindle information

Request time (Page generated in 0.8429 seconds.)

Muscle spindle

Last Update:

Muscle spindles are stretch receptors within the body of a skeletal muscle that primarily detect changes in the length of the muscle. They convey length...

Word Count : 1482

Gamma motor neuron

Last Update:

muscles. However, their role is important in keeping muscle spindles taut, thereby allowing the continued firing of alpha neurons, leading to muscle contraction...

Word Count : 2801

Spindle

Last Update:

make spindles Spindle apparatus or mitotic spindle, a cellular structure in cell biology Muscle spindle, stretch receptors within the body of a muscle Spindle...

Word Count : 248

Type Ia sensory fiber

Last Update:

of a stretch receptor called the muscle spindle found in muscles, which constantly monitors the rate at which a muscle stretch changes. The information...

Word Count : 571

Proprioception

Last Update:

length (group II neurons). These two types of sensory neurons compose muscle spindles. There is a similar division of encoding in invertebrates; different...

Word Count : 6842

Intrafusal muscle fiber

Last Update:

length of a muscle. They constitute the muscle spindle, and are innervated by both sensory (afferent) and motor (efferent) fibers. Intrafusal muscle fibers...

Word Count : 453

Proprioception and motor control

Last Update:

generators (CPGs). At the base level, sensory input is relayed by muscle spindles in the muscle and Golgi tendon organs (GTOs) in tendons, alongside cutaneous...

Word Count : 1729

Hypotonia

Last Update:

intrafusal muscle fibers thereby controlling muscle spindle sensitivity. On examination a diminished resistance to passive movement will be noted and muscles may...

Word Count : 2486

Stretch reflex

Last Update:

muscle length or velocity. It can also include a polysynaptic component, as in the tonic stretch reflex. When a muscle lengthens, the muscle spindle is...

Word Count : 1156

Spinocerebellar tract

Last Update:

Proprioceptive information is obtained by Golgi tendon organs and muscle spindles. Golgi tendon organs consist of a fibrous capsule enclosing tendon...

Word Count : 1434

Delayed onset muscle soreness

Last Update:

sensory fiber terminals within the muscle spindle. Although delayed onset muscle soreness is a symptom associated with muscle damage, its magnitude does not...

Word Count : 2643

Mechanoreceptor

Last Update:

the muscle called muscle spindles. Each muscle spindle consists of sensory nerve endings wrapped around special muscle fibers called intrafusal muscle fibers...

Word Count : 2660

Nuclear chain fiber

Last Update:

contained within a muscle. Nuclear chain fibers are intrafusal fibers that, along with nuclear bag fibers, make up the muscle spindle responsible for the...

Word Count : 355

Stretch receptor

Last Update:

Golgi organ Muscle spindle, sensory receptors within the belly of a muscle, which primarily detect changes in the length of this muscle Pulmonary stretch...

Word Count : 118

Trigeminal nerve

Last Update:

the motor root of the trigeminal nerve and terminate in the muscle spindles in the muscles of mastication. They are proprioceptive fibers, conveying information...

Word Count : 4141

Group A nerve fiber

Last Update:

fibers of the alternative classification system, and are the fibers from muscle spindle endings and the Golgi tendon, respectively. Type Aβ fibres, and type...

Word Count : 751

Reflex arc

Last Update:

muscle reflexes (patellar reflex, achilles reflex), brief stimulation to the muscle spindle results in contraction of the agonist or effector muscle....

Word Count : 594

Multifidus muscle

Last Update:

The multifidus (multifidus spinae; pl.: multifidi) muscle consists of a number of fleshy and tendinous fasciculi, which fill up the groove on either side...

Word Count : 549

Ankle

Last Update:

(CNS). Muscle spindles are thought to be the main type of mechanoreceptor responsible for proprioceptive attributes from the ankle. The muscle spindle gives...

Word Count : 3153

Motor neuron

Last Update:

neurons innervate intrafusal muscle fibers found within the muscle spindle. They regulate the sensitivity of the spindle to muscle stretching. With activation...

Word Count : 2987

Nuclear bag fiber

Last Update:

A nuclear bag fiber is a type of intrafusal muscle fiber that lies in the center of a muscle spindle. Each has many nuclei concentrated in bags and they...

Word Count : 223

Skeletal muscle

Last Update:

of muscles into muscle compartments. Two types of sensory receptors found in muscles are muscle spindles, and Golgi tendon organs. Muscle spindles are...

Word Count : 13876

Hypertonia

Last Update:

excitability of muscle spindles, and decreased synaptic inhibition. These consequences result in abnormally increased muscle tone of symptomatic muscles. Some authors...

Word Count : 1646

Afferent nerve fiber

Last Update:

example, a specific muscle fiber called an intrafusal muscle fiber is a type of afferent neuron that lies parallel to the extrafusal muscle fibers thus functions...

Word Count : 690

Golgi tendon reflex

Last Update:

with a muscle. In contrast to muscle spindles, which are sensitive to changes in muscle length, tendon organs detect and respond to changes in muscle tension...

Word Count : 1402

Spasticity

Last Update:

resistance offered by the muscle is directly proportional to velocity of the passive movement. It is caused by increased muscle spindle excitability and velocity...

Word Count : 3969

Extrafusal muscle fiber

Last Update:

doi:10.1038/nbt.3297. PMID 26237517. S2CID 21241434. "Chapter 1: The Muscle Spindle and the Central Nervous System". Neuromuscular Reeducation with Electromyometric...

Word Count : 349

Spindle cell sarcoma

Last Update:

Spindle cell sarcoma is a type of connective tissue cancer. The tumors generally begin in layers of connective tissue, as found under the skin, between...

Word Count : 336

PDF Search Engine © AllGlobal.net