What is a dermatome?
A papule with irregular borders
A hearing test that uses a tuning fork
A large, leather-covered book
An area of skin that is innervated by a particular spinal nerve
The Correct Answer is D
A. A papule with irregular borders: This description refers to a morphological characteristic of a primary skin lesion, often seen in dysplastic nevi or cutaneous malignancies. It describes a solid, elevated circumscribed growth rather than a sensory mapping of the human body. It lacks any association with the segmental distribution of the peripheral nervous system.
B. A hearing test that uses a tuning fork: This clinical procedure is known as a Weber or Rinne test, used to differentiate between conductive and sensorineural hearing loss. It assesses the auditory pathways of the eighth cranial nerve rather than cutaneous sensory distribution. It has no relevance to the topographical anatomy of the integumentary system.
C. A large, leather-covered book: This choice describes a tome, which is a strictly literary or historical object with no medical or anatomical significance. It is a distractor based on phonetic similarity rather than scientific terminology or clinical practice. It does not relate to the biological functions of the human organism.
D. An area of skin that is innervated by a particular spinal nerve: Dermatomes represent the specific cutaneous regions supplied by the sensory fibers of a single dorsal root. These segments are critical for localizing spinal cord injuries or assessing the progression of viral infections like herpes zoster. They provide a predictable map for clinical neurological examinations and sensory testing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Hyperresonance: This lower-pitched, booming sound is typically elicited over hyperinflated lung tissue, such as in emphysema or pneumothorax. It occurs when an abnormally large amount of air is trapped. It is not the physiological sound produced by solid abdominal viscera.
B. Borborygmus: This term refers to the audible hyperactive bowel sounds produced by the movement of gas and fluid through the intestines. It is an auscultatory finding rather than a percussion tone. It does not describe the sound produced by percussing the liver.
C. Dullness: This medium-pitched, thud-like sound is the standard percussion note over solid organs. The liver, being a dense parenchymal organ, absorbs sound waves rather than reflecting them. It is the expected finding when percussing the right upper quadrant.
D. Tympany: This high-pitched, drum-like sound is heard over air-filled structures like the stomach or intestines. It predominates in the abdomen due to presence of gas. It would be an abnormal finding if heard directly over the solid liver.
Correct Answer is D
Explanation
A. Multiple sclerosis: The pain associated with this condition is primarily neurogenic, resulting from the demyelination and damage of nerves within the central nervous system. It does not stem from the activation of peripheral pain receptors by external tissue damage. It is classified as a neuropathic pain process.
B. Phantom limb: This type of pain occurs when the brain continues to receive sensory signals from a limb that has been surgically removed. It is a complex form of neuropathic pain involving the reorganization of the somatosensory cortex. It lacks an active peripheral noxious stimulus or nociceptor activation in the missing tissue.
C. Shingles (herpes zoster): Postherpetic neuralgia and the acute pain of shingles are caused by viral inflammation of the dorsal root ganglia and peripheral nerves. This is a neuropathic pain condition characterized by burning or lancinating sensations due to nerve dysfunction. It is not a primary nociceptive response to musculoskeletal injury.
D. Touching a hot stove: This represents classic nociceptive pain caused by the activation of specialized nerve endings (nociceptors) in response to actual or potential tissue damage. The thermal stimulus triggers a predictable physiological response that travels via intact neural pathways to the brain. It is the body's protective mechanism against external injury.
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