Sannus Story

Topics: Nervous system, Central nervous system, Sensory system Pages: 3 (987 words) Published: April 25, 2013
A. Leprosy, caused by the bacterium Mycobacterium leprae, is leading cause of peripheral neuropathy worldwide; although it is treatable, the damage caused by the disease is irreversible. In Sannu’s case, why is there both sensory loss and muscle weakness? From the repeated injuries Sannu is having repeated nerve damage. When someone has Leprosy and it is untreated they can lose sensation in that extremity due to the body’s defense mechanism. This will cause loss of feeling in the skin and weakens muscle. B. Leprosy can affect the skin and Schwann cells of peripheral nerves. Which events of sensation processing are most likely not functioning properly in Sannu’s leprosy? Generation of nerve impulses is probably not working properly. Sensory neurons conduct impulses from the peripheral nervous system, so when the leprosy affects the Schwann cells of the peripheral nerves it is not conducting the impulse to integrate the sensory input. C. Were somatic, visceral, or special senses being investigated when Dianna evaluated Sannu’s Achilles and Babinski reflex activity? No, Dianna was just evaluating somatic and visceral when investigating Sannu, not special senses. She was checking sensation by pressure and reflexes rather than vision, hearing, and taste. D. Sannu has lost sensation of pain, temperature, light touch, and pressure. What types of receptors endings mediate the detection of these sensations? Free nerve endings are receptors for pain, temperature, itch, and some touch sensations. Encapsulated nerve endings are receptors for pressure, vibration and also some touch.

E. Leprosy infects the body via the skin, typically in the cooler regions of the body. Based on this information, would you expect Sannu’s interoceptors to be affected? No, the interceptors are located in blood vessels, organs, muscles, and the nervous system. Judging by this information if leprosy infects the skin and interceptors are made to monitor the internal environment....
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