The gamma MN is an efferent neuron regulating the contraction In the stretch reflex, alpha-gamma co-activation Thus a stretch could indirectly activate the.
Stretch Reflex Mechanism. To emphasize the importance of the gamma efferent system, an effect called co-activation of the alpha and gamma motor neurons.
2.1 Spinal Reflexes. Gamma motor neurons, If contraction of a muscle causes the activation of the stretch reflex of the antagonist muscle.
co-activation of both the alpha and gamma motor neurons (step 3) prevents the spindle afferents from becoming completely silent during step 5 (i.e., the gap in firing shown in the diagram doesn't happen in real life!) activation of the gamma motor neurons contracts the intrafusal fibres and lengthens the central region of the spindle, maintaining the stretch on the sensory nerve endings, keeping the receptor in the middle of its dynamic range this is the key to maintaining tone resistance of a muscle to stretch is called TONE (or TONUS) severing the motor nerve to a muscle (or causing a LOWER MOTOR NEURON LESION) eliminates resistance à FLACCID PARALYSIS
Reflex Activity. Is regulated by activation/inhibition of the gamma motor neuron Opposite of Stretch Reflex the stretched or contracting muscle.
Due to the same mechanism described below for the stretch reflex ; muscle stretch of a stretch reflex muscle spindles in the gamma efferent discharge is.
Review of reflex arc. Muscle Stretch Reflex These alpha-gamma co-activation. Review of reflex arc. The stretch receptor. C gamma efferent neuron to.
Gamma motor neuron
Spindle physiology
Gamma motor neurons (γ motor neurons), also called gamma motoneurons, are a type of lower motor neuron that take part in the process of muscle contraction, and represent about 30% of fibers going to the muscle. Like alpha motor neurons, their cell bodies are located in the anterior horn of the spinal cord. They receive input from the bulboreticular facilitatory region of the pons in the brainstem. Their axons are smaller than alpha motor neurons, with a diameter of only 5 μm.