reflex action

action /ac·tion/ (ak´shun) the accomplishment of an effect, whether mechanical or chemical, or the effect so produced.

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ball-valve action  the intermittent obstruction caused by a free or partially attached foreign body in a tubular or cavitary structure, as by a foreign body in a bronchus, a stone in a bile duct, or a tumor in the cardiac atrium.

Ball-valve action. Calculi obstructing the cystic duct (A), common hepatic duct (B), and common bile duct (C) .

cumulative action  action of increased intensity, as the sudden and markedly increased action of a drug after administration of several doses, due to the accumulation of the drug in the body.

reflex action  a response, often involuntary, resulting from passage of excitation potential from a receptor to a muscle or gland over a reflex arc.

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reflex action,

the involuntary functioning or movement of any organ or body part in response to a particular stimulus. The function or action occurs immediately, without the involvement of the will or consciousness.

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reflex

a reflected involuntary action or movement; the sum total of any particular automatic response mediated by the nervous system.

A reflex is built into the nervous system and does not need the intervention of conscious thought to take effect.

For reflexes used in clinical examination of a patient see under individual titles including anal, blink, corneal, conjunctival, crossed extensor, extensor thrust, eyelid, gastrocnemius, hopping, palpebral, panniculus, patellar, perineal, placing, pupillary, withdrawal.

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accommodation reflex

the coordinated changes that occur when the eye adapts itself for near vision; they are constriction of the pupil, convergence of the eyes and increased convexity of the lens.

reflex action

an involuntary response to a stimulus conveyed to the nervous system and reflected to the periphery (see also reflex).

reflex bradycardia

bradycardia occurring as a reflex initiated by severe atrial or ventricular stretch.

chain reflex

a series of reflexes, each serving as a stimulus to the next, making a complete activity.

complete reflex

one requiring no feedback from the forebrain.

conditioned reflex

see conditioned response.

cutaneous trunci reflex

see panniculus reflex.

dazzle reflex

a test of the retina, optic nerve, and central retinal pathways. Shining a bright light into the eye should cause squinting.

reflex dyssynergia

see detrusor-urethral dyssynergia.

gastroileal reflex

increase in ileal motility and opening of the ileocecal valve when food enters the empty stomach.

light reflex

see pupillary light reflex.

nociceptive reflex

reflexes initiated by painful stimuli.

palatal reflex

see swallowing reflex.

rectosphincteric reflex

relaxation of the anal sphincter which occurs with distention of the rectum and during defecation.

stepping reflex

movements of progression elicited when the animal is held upright and inclined forward with the feet touching a flat surface.

stretch reflex

reflex contraction of a muscle in response to passive longitudinal stretching.

superficial reflex

any withdrawal reflex elicited by noxious or tactile stimulation of the skin, cornea or mucous membrane, including the corneal and pharyngeal reflexes.

tapetal reflex

tapetal reflection of light.

tendon reflex

a method of testing the patency of reflex arc. The tendon is stretched sharply by tapping it close to its insertion. A positive reaction is a sharp contraction of the muscle of which the tendon is part. The patellar reflex is the best known of these reflexes. Absence indicates a defect in the reflex arc, an exaggerated response suggests an upper motor neuron lesion. Called also myotactic reflex.

tonic reflex

see tonic neck response.

triceps surae reflex

Achilles reflex.

trigemino-abducens reflex

a test of the ophthalmic and mandibular divisions of the trigeminal nerve, and the abducens nerve. Light touching of the cornea should result in retraction of the globe and protrusion of the nictitating membrane.

reflex walking

spinal reflexes can provide support and uncoordinated use of the hindlegs that resembles walking, in dogs with transection of the spinal cord between T13 and L4.

whisker reflex

pinching the pinna elicits a twitch of the whiskers in cats; used in assessment of depth of anesthesia.

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Patient discussion about reflex action.

Q. Anyone have/hear of RSD (Reflex Sympathetic Dystrophy) CRPS etc ,I have Fibro too Reflex Synmpathetic Dystrophy or CRPS and I have Fibromyalgia any others with CNS problems

A. Ok I would like to ask if any others with RSD would like to get to know each other it looks like they have groups ,no one without RSD can appreciate the pain and the way those who you love the most ,think you are a faker because some RSDers ,you can't see anything readily ,not being believed with Nerve pain thayt is worse than anything I have felt like being shot ,blown up ,Third Degree Burns well kinda like when the nerves stgart to grow back from Third degree burns but 24/7 and the same degree of p[ain since 1968 .IF RSD IS CAUGHT IN THE FIIRST YEAR IT CAN BE Reversed so yes I want knowledge (oops didnt mean caps(to yell)Thank You rsdno