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Transcript of Reflexes
What is a Reflex?
The Babinski sign is a reflex that is pathological in adults but normal in infants. Scraping the sole of the foot of a normal adult with a tongue depressor results in plantar flexion of the toes.
the stretch reflex and autogenic inhibition play a major role in control of the intercostal muscles during inspiration.
Baroreceptors (pressure receptors) in the carotid sinus, in the aortic arch, and perhaps elsewhere, increase their discharge rates in response to elevated blood pressure.
Reflex is an automatic response of the body to a stimulus
Vomiting is the result of a reflex arc involving receptors in the region of the pharynx, supplied by the IXth and Xth cranial nerves and also receptors in the medulla.
The reflex is triggered by tactile stimulation of the mucosa of the palate, pharynx, and epiglottis.
Swallowing is also a reflex activity
Temperature regulation is a complicated reflex activity, involving both peripheral thermoreceptors and central thermoreceptors
Micturition is a reflex activity that depends upon stretch receptors located in series with smooth muscle cells of the bladder wall.
The Function and Utility of Reflexes
(1) how the nerve circuits of the spinal cord or brain stem are put together and
(2) the condition of various parts of these circuits.
A patient complains of paresis or weakness of the right leg.
There are three possible causes for this paresis:
he is suffering from disease of descending tracts having to do with leg function;
he is suffering from disease of the -motoneurons themselves
something is wrong with the muscle.
Relexes are tested using a percussion hammer.
Several reflexes are normally tested during physical examination: