Muscle receptos& Spinal reflexes

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Title: Muscle receptos& Spinal reflexes
Description: A reflex is an involuntary and relatively stereotyped response to a specific sensory stimulus. Two features of the sensory stimulus are particularly important in shaping the reflex response. First, the precise location of the stimulus determines in a fixed way the particular muscle that contract to produce the reflex response. Second the strength of the stimulus determines the amplitude of the response. Reflex therefore are graded behaviors. Spinal reflexes are those in which the sensory stimuli arise from receptors in muscles, joints and skin, and in which the neural circuitry responsible for the motor response is entirely contained within the spinal cord. Although the neural circuits that mediate spinal reflexes are relatively simple, descending influences from higher brain centers often use these spinal circuits to generate more complex behavior. Brian stem reflexes, such as gagging and vestibulo-ocular reflex, follow basically similar rules. First let's examine the neural circuitry of one spinal reflex: the stretch reflex. This is the simplest reflex known; it depends only in the monosynaptic connection between primary afferent fibers from muscle spindles and motor neurons innervating the same muscle.
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Comments:

Name: Donna drover	Date: 2008-10-16
Love this animation. It is the first time that soem of my grade 12's have grasped the concept of muscle spindles and golgi tendon organs

Name: DrMujahid	Date: 2008-05-16
Beautiful explanation

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