What are ipsilateral 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 is contralateral acoustic reflex?
During contralateral acoustic reflex measures, direct interactions of the probe and the activating stimuli are not possible, since the probe is presented to the test ear and the reflex activating stimuli are presented to the contralateral ear.
What does positive reflex decay mean?
The test is positive if the magnitude of the reflex decreases by more than 50% in ten seconds. In a normal ear, the reflex should stay contracted for the full 10 seconds. You are testing the ear which received the stimulus (not the probe ear). This concept tends to trouble many of my students.
What is the difference between ipsilateral and contralateral reflexes?
Ipsilateral refers to structures on the same side of the body or brain (left or right), whereas contralateral refers to structures on opposite sides of the body.
Is the reflex ipsilateral or contralateral?
Both are examples of ipsilateral reflexes, meaning the reflex occurs on the same side of the body as the stimulus. The crossed extensor reflex is a contralateral reflex that allows the body to compensate on one side for a stimulus on the other.
What is a contralateral response?
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.
Which reflex stimulates ipsilateral extensors?
The crossed extensor reflex or crossed extensor response or crossed extension reflex is a reflex in which the contralateral limb compensates for loss of support when the ipsilateral limb withdraws from painful stimulus in a withdrawal reflex.
Is withdrawal reflex ipsilateral or contralateral?
This contralateral stimulation of motor neurons to stabilize the body is called the crossed extension reflex, and is a result of the withdrawal reflex (usually in the lower extremities).
What does ipsilateral mean in relation to reflex arcs?
on the same side of the body
Both are examples of ipsilateral reflexes, meaning the reflex occurs on the same side of the body as the stimulus. The crossed extensor reflex is a contralateral reflex that allows the body to compensate on one side for a stimulus on the other.