What is the role of muscle spindles in the stretch reflex?
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.
What reflex does the muscle spindle participate in?
stretch reflex
The responses of muscle spindles to changes in length also play an important role in regulating the contraction of muscles, by activating motor neurons via the stretch reflex to resist muscle stretch.
Which spinal reflex is initiated by stretching of the muscle spindle?
myotatic reflex
The myotatic reflex is initiated by the muscle spindle, not the Golgi tendon organ.) As discussed below, spinal reflexes can be modulated by higher levels of the hierarchy, and thus a hyperactive or hypoactive stretch reflex is an important clinical sign to localize neurological damage.
What happens when the 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 muscle stretch reflex?
The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching. When a muscle is stretched, the stretch reflex regulates the length of the muscle automatically by increasing its contractility as long as the stretch is within the physiological limits.
What is the stretch reflex?
What happens when muscle spindle is stretched?
How does a stretch reflex occur?
The stretch reflex is activated (or caused) by a stretch in the muscle spindle. When the stretch impulse is received a rapid sequence of events follows. The motor neuron is activated and the stretched muscles, and its supporting muscles, are contracted while its antagonist muscles are inhibited (relaxed).
What is the response of a muscle stretch reflex?
The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching by increasing its contractility as long as the stretch is within physiological limits.
What initiates the stretch reflex?
What’s a stretch reflex?
What are the simple stretch reflexes?
The stretch reflex is also referred to as the deep tendon reflex or myotatic reflex. It is a simple pre-programmed response by the human body in response to the muscle being passively stretched e.g. by a tendon hammer, or a sudden change in the ground surface.
What is stimulus in a stretch reflex?
The stretch reflex (also called the myotatic reflex, the muscle stretch reflex and sometimes the knee-jerk reflex), is a pre-programmed response by the body to a stretch stimulus in the muscle . When a muscle spindle is stretched an impulse is immediately sent to the spinal cord and a response to contract the muscle is received.
What muscle spindles are receptors sensitive to?
Muscle spindles are sensitive to both the phasic stretch (the rate at which a muscle stretches) and the tonic stretch (the extent to which the muscle is stretched).
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.