What is a Myotatic stretch reflex?

What is a Myotatic 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 Myotatic inhibition?

When the tension is extreme, the inhibition can be so great it overcomes the excitatory effects on the muscle’s alpha motoneurons causing the muscle to suddenly relax. This reflex is also called the inverse myotatic reflex, because it is the inverse of the stretch reflex.

Why is myotatic reflex important?

The purpose of the myotatic reflex is to resist changes in muscle length. This is useful when one is trying to maintain the position of a limb during purposeful work or in maintaining posture, but it is counter-productive during purposeful movements when the muscles must contract while their antagonist member relaxes.

What is the Myotatic reflex quizlet?

Myotatic Reflex. aka “the stretch reflex” or “the Deep Tendon reflex” • Definition: Tonic contraction of the muscles in response to a. stretching force, due to stimulation of muscle proprioceptors. • It is the basis of the knee jerk response that is routinely tested in the neurological examination.

What is reverse Myotatic reflex?

The Inverse Myotatic Reflex Involves Sensors of Muscle Force in the Tendon. Stretch receptors called Golgi tendon organs are found within the collagen fibers of tendons and within joint capsules. They are generally located in series with the muscle rather than the parallel arrangement of the intrafusal muscle fibers.

How might this patellar reflex help maintain upright posture?

Stretch reflexes are very important in maintaining your upright posture in humans. Tapping the patellar tendon stretches the quadriceps muscle and causes the sensory receptor of the muscle, called a spindle fiber, to send a signal along the afferent neuron to the spinal cord.

Did the Jendrassik position affect the magnitude of the knee jerk reflex?

The Jendrassik maneuver will heighten (exaggerate) the patellar (knee-jerk) reflex by countering some of the normal descending inhibitory brainstem inputs to reflex arc interneurons.

What is the inverse Myotatic reflex?

The Inverse Myotatic Reflex Involves Sensors of Muscle Force in the Tendon. Stretch receptors called Golgi tendon organs are found within the collagen fibers of tendons and within joint capsules. In this way, high force development that could injure muscles can be prevented by relaxation of the muscle.

Is the Myotatic reflex MonoSynaptic?

The Myotatic Reflex Is a MonoSynaptic Reflex Between Ia Afferents and the α Motor Neuron. The myotatic reflex is the “knee-jerk” reflex in which a muscle contracts in direct response to its stretch. It is typically elicited by tapping on the tendon of a muscle, which deforms the tendon and stretches the muscle.