Quick Reference. A reflex action mediated by the Golgi tendon organs that, when the organs are stimulated by a prolonged stretch, cause the stretched muscle to relax.
Is clonus a spasticity?
Spasticity often occurs with clonus. It involves long-term muscular tightness. Spasticity, as seen in clonus, is caused by damaged nerves among the brain, spinal cord, and muscles. This abnormal activity is thought to disrupt muscle movement by causing involuntary contractions, stiffness, and pain.
What is muscle spindle stretch reflex?
This process is called the stretch reflex. When a muscle spindle’s associated muscle is rapidly stretched, the spindle can cause two things to happen: Functionally, muscle spindles are stretch detectors, and sense how much and how fast a muscle is lengthened or shortened.
What happens when a muscle spindle is stretched?
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.
What is the difference between muscle spindle and Golgi tendon organ?
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.
What is a muscle spindle?
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.
What is Monosynaptic stretch reflex?
The monosynaptic stretch reflex, or sometimes also referred to as the muscle stretch reflex, deep tendon reflex, is a reflex arc that provides direct communication between sensory and motor neurons innervating the muscle.
What is Alpha Gamma Coactivation?
Thus, when the CNS instructs a muscle to contract, it not only sends the appropriate signals to the alpha motor neurons, it also instructs gamma motor neurons to contract the intrafusal fibers appropriately; this coordinated process is referred to as alpha-gamma coactivation.
What are the two types of stretches?
There are two main types of stretches: static stretches and dynamic stretches. Static stretches are those in which you stand, sit or lie still and hold a single position for period of time, up to about 45 seconds.
What is Intrafusal muscle fibers?
Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors). They detect the amount and rate of change in length of a muscle. They constitute the muscle spindle, and are innervated by both sensory (afferent) and motor (efferent) fibers.
What is reciprocal inhibition and why does it exist?
It is a general phenomenon in which the stretch of one muscle inhibits the activity of the opposing muscle. Reciprocal inhibition prevents muscles from working against each other when external loads are encountered.
