What is Supraspinal reflex?

What is Supraspinal reflex?

Supraspinal control of the stretch reflex means the signal travels above the spinal cord before traveling back down to the same segment it entered the spinal cord from.

What is Supraspinal motor control?

Abstract. The control of spinal reflex mechanisms from supraspinal structures is exerted in the most developed form (in mammals) by four descending systems (cortico-, rubro-, reticulo- and vestibulo-spinal).

Which reflex is contralateral?

The crossed extensor reflex
The crossed extensor reflex is contralateral, meaning the reflex occurs on the opposite side of the body from the stimulus. To produce this reflex, branches of the afferent nerve fibers cross from the stimulated side of the body to the contralateral side of the spinal cord.

What is the function of the supraspinal descending inhibitory motor pathways?

briefly explain the function of the supraspinal descending inhibitory motor pathways. they modulate reflex arc sensitivity, normally preventing hypereflexia, or exaggerated reflexes. there are two pathways by which the jendrassik maneuver facilitates alpha motor neuron output.

Why does UMN lesion cause spasticity?

How does UMN lesion cause spasticity and associated phenomena? The major problem is a loss of control of the spinal reflexes. Spinal reflex activity is normally tightly regulated and if inhibitory control is lost, the balance is tipped in favor of excitation, resulting in hyperexcitability of the spinal reflexes.

What does Supraspinal mean?

above a spine
Medical Definition of supraspinal : situated or occurring above a spine especially : situated above the spine of the scapula.

What is stretch reflex physiology?

Introduction. 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 difference between ipsilateral and contralateral reflexes?

Ipsilateral means ‘same side’ and contralateral means ‘opposite side’. The reflexes are always indicated by the probe ear. For both pathways, the loud sound travels through the outer, middle, and inner ear, then along the vestibulocochlear nerve (CNVIII) to the brainstem arriving at the cochlear nucleus.

What reflexes are controlled by the spinal cord?

A major part of the spinal cord function is regulated by the brain. Many functions of the spinal cord are also executed independently from the brain, such as a spinal reflex….Monosynaptic reflex.