Tendon reflex (or T-reflex) is a feedback mechanism that controls increasing muscle tension by causing muscle relaxation before tension force becomes so great it may damage the muscle
The sensory receptor that detects change in tension is the golgi tendon which lie within tendon. It causes the muscle to relax via a polysynaptic reflex in order to decrease tension in the tendons. Another motor neuron sends efferent impulse to its antagonistic muscle, causing it to contract.
The stretch reflex operates as a feedback mechanism to control muscle length by causing muscle contraction. In contrast, the tendon reflex operates as a feedback mechanism to control muscle tension by causing muscle relaxation before muscle force becomes so great that tendons might be torn. Although the tendon reflex is less sensitive than the stretch reflex, it can override the stretch reflex when tension is great, making you drop a very heavy weight, for example. Like the stretch reflex, the tendon reflex is ipsilateral. The sensory receptors for this reflex are called tendon Golgi receptors, which lie within a tendon near its junction with a muscle. In contrast to muscle spindles, which are sensitive to changes in muscle length, tendon organs detect and respond to changes in muscle tension that are caused be passive stretch or muscular contraction. A tendon reflex operates as follows: It has been suggested that this article or section be merged with Feedback loop. ... The anatomical planes The anatomical position is a schematic convention for describing the relative morphology of the human body. ... Organ of Golgi (neurotendinous spindle) from the human tendo calcaneus. ...
As the tension applied to a tendon increases, the Golgi tendon organ (sensory receptor) is stimulated (depolarized to threshold).
Nerve impulses (action potentials) arise and propagate into the spinal cord along a sensory neuron.
Within the spinal cord (integrating center), the sensory neuron activates an inhibitory interneuron that makes a synapse with a motor neuron.
The inhibitory neurotransmitter inhibits (hyperpolarizes) the motor neuron, which then generates fewer nerve impulses.
The muscle relaxes and relieves excess tension.
Look up Threshold in Wiktionary, the free dictionary. ... A. A schematic view of an idealized action potential illustrates its various phases as the action potential passes a point on a cell membrane. ... An interneuron (also called relay neuron or association neuron) is a neuron that communicates only to other neurons. ... Chemical structure of D-Aspartic Acid, a common Amino Acid neurotransmitter. ...
Spinal induction obviously tends to connect to this extensor-thrust flexion of the limb as an after-effect.
If both reflexes are fresh, and the stimuli used are such as, when employed separately, evoke their reflexes respectively with some intensity, in my experience it is the flexion-reflex that is usually prepotent.
From the local spinal grey matter the pain-path is continued headward in the lateral white columns of the cord by secondary afferent neurones.
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