Cutaneous Innervation and Dermatomes

Cutaneous Innervation and Dermatomes - suppress reflexes...

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spinal cord Cutaneous Innervation and Dermatomes * each spinal nerve except C1 receives sensory input from a specific area of skin called a dermatome * dermoatomes overlap in their edges by as much as 50%, therefore severance of onw sensory nerve root does not entirely deaden sensation from a dermatome. * Spinal nerve damage is assessed by testing the dermatomes with pinpricks and noting areas in which the patient has no sensation Somatic Reflexes * Reflexes are quick, involuntary, stereotyped reactions tf glands or muscles to stimulation * Four important properties of reflexes * reflexes require stimulation- they are not spontaneous * reflexes are quick- involve few if any interneurons and miminum synaptic delay * reflexes are involuntary- they occur without intent, or awareness, and are difficult to
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Unformatted text preview: suppress * reflexes are stereotyped- they occur in essentially the same way every time. Somatic Reflexes Somatic reflex employ a reflex arc * somatic receptors in the skin, muscle or a tendon * afferent nerve fibers-carry information from receptors into the dorsal horn of the cord * interneurons- integrate information (lacking in some reflexes) * efferent nerve fibers-carry motor impulses to the skeletal muscle * skeletal muscle-the somatic effectors that carry out the response Muscle Spindle * are stretch receptors in the muscle * a type of proprioceptor- sense organs that monitor the position and movements of body parts * more abundant in muscles that require fine control...
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