What is the inverse 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.
What is an example of a stretch reflex?
The patellar reflex (knee jerk) is an example of the stretch reflex and it is used to determine the sensitivity of the stretch reflex. Reflexes can be tested as part of a neurological examination, often if there is an injury to the central nervous system. To test the reflex, the muscle should be in a neutral position.
What is stretch and inverse stretch reflex?
This reflex, which connects high force in the Golgi tendon organs with relaxation, is the opposite of the myotatic reflex, the stretch reflex, in which stretch elicits a reflex contraction. Thus, this reflex is called the inverse myotatic reflex even though the muscle is not necessarily stretched.
What are the differences between a stretch and Golgi tendon reflex?
When the organs are stimulated by a prolonged stretch they cause the stretched muscle to relax. This reflex, which connects high force in the Golgi tendon organs with relaxation, is the opposite of the myotatic reflex (or stretch reflex), in which stretch elicits a reflex contraction.
What is tonic stretch reflex?
The tonic stretch reflex was first described by Charles Sherrington nearly one hundred years ago. It represents an involuntary change in muscle activation and force with a change in muscle length.
Are Golgi tendon organs Intrafusal or Extrafusal?
Extrafusal muscle fibers attach to bones with tendons which are a specific type of connective tissue. These tendons have proprioceptors called golgi tendon organs which lie at the ends of these extrafusal fibers.
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 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 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 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 is the difference between Extrafusal and Intrafusal muscle fibers?
Muscles have receptors for stretch and force. Extrafusal muscle fibers comprise the bulk of muscle and form the major force-generating structure. Intrafusal muscle fibers are buried in the muscle, and they contain afferent receptors for stretch, but they also contain contractile elements.
Why is a muscle spindle considered a Proprioceptor?
Muscle spindles are proprioceptors that consist of intrafusal muscle fibers enclosed in a sheath (spindle). They run parallel to the extrafusal muscle fibers and act as receptors that provide information on muscle length and the rate of change in muscle length. The spindles are stretched when the muscle lengthens.
What is the inverse stretch reflex Quizlet?
What is inverse 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. Click to see full answer.
What is an example of the stretch reflex?
Another example of the stretch reflex is the knee-jerk test performed by physicians. When the patellar tendon is tapped with a small hammer, or other device, it causes a slight stretch in the tendon, and consequently the quadriceps muscles. The result is a quick, although mild, contraction of the quadriceps muscles,…
How is the stretch reflex activated and inhibited?
The motor neuron is activated and the stretched muscles, and its supporting muscles, are contracted while its antagonist muscles are inhibited (relaxed). The stretch reflex can be activated by external forces (such as a load placed on the muscle) or internal forces (the motor neurons being stimulated from within.)
Where are the spindles of the stretch reflex?
Anatomy of the Stretch Reflex Located within the belly of the muscle, between and parallel to the main muscle fibers, are muscle spindles. These muscle spindles are made up of spiral threads called intrafusal fibers, and nerve endings, both encased within a connective tissue sheath.