Testing Your Comprehension Mfz
1. The principle of neuronal convergence is explained on page 472. Discuss its relevance to referred pain and scotopic vision.
2. What type of cutaneous receptor
enables you to feel an insect crawling through your hair? What type enables you to palpate a patient's pulse? What type enables a blind person to read braille?
3. Contraction of a muscle usually puts more tension on a structure, but
Saladin: Anatomy & I 16. Sense Organs I Text I © The McGraw-Hill
Physiology: The Unity of Companies, 2003 Form and Function, Third Edition contraction of the ciliary muscle puts less tension on the lens. Explain how.
4. Janet has terminal ovarian cancer and is in severe pelvic pain that has not yielded to any other treatment. A neurosurgeon performs an anterolateral cordotomy, cutting across the anterolateral region of her lumbar spinal cord. Explain the rationale of this treatment and its possible side effects.
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5. What would be the benefit of a drug that blocks the receptors for substance P?
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