Menu Close

What type of stimulus are muscle spindles most sensitive?

What type of stimulus are muscle spindles most sensitive?

Stretch reflex When a muscle is stretched, primary type Ia sensory fibers of the muscle spindle respond to both changes in muscle length and velocity and transmit this activity to the spinal cord in the form of changes in the rate of action potentials.

What are muscle sensory receptors?

Almost every muscle contains muscle spindles. These delicate sensory receptors inform the central nervous system (CNS) about changes in the length of individual muscles and the speed of stretching.

Are muscle spindles stretch receptors?

Muscle spindles are stretch receptors that signal the length and changes in length of muscles. They lie within an independent capsule, parallel to the main muscle. They are therefore stretched when the muscle lengthens but shorten when the muscle contracts.

What type of sensation the muscle spindle receptors detect?

stretch
Sensory receptors can be classified by location: Cutaneous receptors are sensory receptors found in the dermis or epidermis. Muscle spindles contain mechanoreceptors that detect stretch in muscles.

What stimulus do muscle spindles respond to?

Whenever skeletal muscle is stretched the muscle spindles are stimulated. They detect changes in the length of muscle fibers as well as the rate of change at which the muscles are lengthening. The Muscle Spindle consists of 2-10 specialized muscle fibers enclosed in a connective tissue capsule.

What is the difference between Golgi tendon organs and muscle spindles?

The key difference between muscle spindle and Golgi tendon organ is that muscle spindle is a sensory organ that senses the changes in muscle length and the rate of lengthening, while Golgi tendon organ is a sensory organ that senses the changes in muscle tension.

Do muscle spindles contain sensory endings?

Muscle spindles are more complex. They may have one or more sensory endings as well as their own motor innervation. They are located between fascicles of extrafusal muscle fibers and respond to muscle length and its rate of change.

What do muscle spindles sense?

Functionally, muscle spindles are stretch detectors, i.e. they sense how much and how fast a muscle is lengthened or shortened [19]. Accordingly, when a muscle is stretched, this change in length is transmitted to the spindles and their intrafusal fibers which are subsequently similarly stretched.

Which stimulus causes a muscle to reflexively contract?

A sudden stretch, such as tapping the Achilles’ tendon, causes a reflex contraction in the muscle as the spindles sense the stretch and send an action potential to the motor neurons which then cause the muscle to contract; this particular reflex causes a contraction in the soleus-gastrocnemius group of muscles.

What do Golgi tendon organs detect?

The golgi tendon organ is a proprioceptor, sense organ that receives information from the tendon, that senses TENSION. When you lift weights, the golgi tendon organ is the sense organ that tells you how much tension the muscle is exerting.

How do muscle spindles work?

When muscles lengthen, the spindles are stretched. This stretch activates the muscle spindle which in turn sends an impulse to the spinal cord. This impulse results in the activation of more motor neurons at spinal level that send an impulse back to the muscle.

Which reflex occurs in response to excessive tension on a tendon?

Functions of Golgi tendon reflex The Golgi tendon reflex is a response to extensive tension on a tendon. It helps avoid strong muscle contractions which could tear the tendon from either the muscle or bone. In sports, quick movements can damage the tendon before the reflex can occur.

Are stretch receptors located in the muscle spindle?

Muscle spindles are stretch receptors within the body of a 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.

What do muscle spindles mean?

Here are all the possible meanings and translations of the word MUSCLE SPINDLE. Muscle spindles are sensory receptors within the belly of a muscle, which primarily detect changes in the length of this muscle. They convey length information to the central nervous system via sensory neurons.

What does muscle spindle mean?

muscle spindle. n. A sensory receptor in a muscle that responds to the stretching of tissue.