What is the basic circuit of muscle stretch reflex?
David Jones
Updated on April 04, 2026
If the antagonistic group did not relax, both groups of muscles would contract, resulting in no corrective movement. The stretch reflex is an example of a circuit that skips the brain, and follows the simple neural loop connecting the muscle to the spinal cord and back. This enables a rapid response.
What stimulates the myotatic reflex?
The myotatic reflex is the “knee-jerk” reflex in which a muscle contracts in direct response to its stretch. It is typically elicited by tapping on the tendon of a muscle, which deforms the tendon and stretches the muscle.
What is static stretch reflex?
Static Stretch Reflexes. – Is the stretch reflex ability to prevent oscillation or jerkiness. of body movements. – -Signals from the spinal cord are transmitted to a muscle in an unsmooth form, with increasing or decreasing in intensity for few milliseconds, the muscle contraction will be jerky such signals.
What is the function of the stretch reflex in everyday life?
The stretch reflex can be a monosynaptic reflex which provides automatic regulation of skeletal muscle length, whereby the signal entering the spinal cord arises from a change in muscle length or velocity.
Is Golgi tendon a stretch reflex?
The Golgi tendon reflex (also called inverse stretch reflex, autogenic inhibition, tendon reflex) is an inhibitory effect on the muscle resulting from the muscle tension stimulating Golgi tendon organs (GTO) of the muscle, and hence it is self-induced.
How does the myotatic reflex work?
The stretch reflex (myotatic reflex), or more accurately “muscle stretch reflex”, is a muscle contraction in response to stretching within the muscle. The reflex functions to maintain the muscle at a constant length. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases.
When does the myotatic reflex occur?
When a muscle spindle is stretched an impulse is immediately sent to the spinal cord and a response to contract the muscle is received. Since the impulse only has to go to the spinal cord and back, not all the way to the brain, it is a very quick impulse. It generally occurs within 1-2 milliseconds.
What are two important roles of the stretch reflex?
The stretch reflex (myotatic reflex), or more accurately “muscle stretch reflex”, is a muscle contraction in response to stretching within the muscle. The reflex functions to maintain the muscle at a constant length….Clinical significance.
| Grade | Response | Significance |
|---|---|---|
| 4+ | clonus | always abnormal |
Are humans born with stretch reflexes?
In the current study of newborns, we recorded stretch reflex responses from all major muscle groups of the lower limb. This “irradiation of reflexes” is a normal phenomenon of the newborn CNS. This pathway becomes suppressed during normal maturation and control of coordinated limb movements.
How long does it take for the stretch reflex to occur?
It generally occurs within 1-2 milliseconds. The stretch reflex is designed as a protective mechanism for the muscles, to prevent tearing. The muscle spindle is stretched and the impulse is also immediately received to contract the muscle, protecting it from being pulled forcefully or beyond a normal range.
What is the monosynaptic stretch reflex?
The Monosynaptic Stretch Reflex. A monosynaptic reflex, such as the knee jerk reflex, is a simple reflex involving only one synapse between the sensory and motor neurone. The pathway starts when the muscle spindle is stretched (caused by the tap stimulus in the knee jerk reflex). The muscle spindles are responsible for detecting the length…
What is the threshold of the muscle spindle stretch reflex?
By contrast, the threshold of the muscle spindle stretch reflex is set much lower. The stretch reflex is very important in posture. It helps maintain proper posturing because a slight lean to either side causes a stretch in the spinal, hip and leg muscles to the other side, which is quickly countered by the stretch reflex.
Is the muscle stretch reflex a high frequency tremor?
Muscle stretch reflexes demonstrate a rigid hypertonus, but there is no plastic rigidity, and repeated testing will produce fluctuations in the tonus. The tremor is a high-frequency postural tremor (8–10 Hz), but a parkinsonian, resting tremor is not observed. However, adult onset patients may show resting tremor of lower frequency.
