A 25-year-old man complains of a sharp pain in the lower back. He has difficulty walking on his heels and has associated weakness in the extensors of the big toes. Which of the lumbar nerves is possibly associated with these symptoms?

Answer and Explanation

The Correct Answer is C

Choice A reason: The L1 nerve root primarily innervates the groin and upper thigh region. Damage to L1 may cause pain or sensory changes in these areas but does not typically affect heel walking or toe extension, which are controlled by more distal nerve roots.

Choice B reason: The L3 nerve root contributes to thigh adduction and knee extension. Symptoms of L3 involvement include anterior thigh pain and weakness in quadriceps muscles, not the dorsiflexion of the foot or toe extension.

Choice C reason: The L5 nerve root innervates muscles responsible for dorsiflexion of the foot and extension of the big toe, such as the extensor hallucis longus and tibialis anterior. Difficulty walking on heels and weakness in toe extension are hallmark signs of L5 radiculopathy. This nerve also contributes to sensation on the dorsum of the foot, aligning with the patient's symptoms.

Choice D reason: There is no L7 nerve root in the human lumbar spine. The lumbar spine consists of five vertebrae (L1–L5), followed by the sacral region. Therefore, this option is anatomically incorrect.

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Correct Answer is B

Explanation

Choice A reason: The amygdala is primarily involved in emotional processing, particularly fear and aggression. While it may influence sleep indirectly through emotional arousal, it is not the central regulator of the sleep-wake cycle.

Choice B reason: The hypothalamus plays a critical role in regulating the sleep-wake cycle. It contains the suprachiasmatic nucleus (SCN), which serves as the body’s master circadian pacemaker. The SCN receives light input from the retina and synchronizes physiological processes, including melatonin release and sleep timing.

Choice C reason: The cerebellum is responsible for coordination of voluntary movements, balance, and motor learning. It does not have a direct role in sleep regulation.

Choice D reason: The frontal lobe is involved in executive functions, decision-making, and personality. Although sleep deprivation affects frontal lobe performance, it is not the primary center for sleep-wake regulation.

A. Inflammation of the bronchial wall leads to mucosal thickening, epithelial cell desquamation, and denudation of the basement membrane. B. An irritant causes an inflammatory response, which leads to destruction of the alveolar air sacs. This causes irreversible obstructive airway physiology. C. Airway obstruction occurs due to the combination of inflammatory cell infiltration, mucus hypersecretion with mucus plug formation, and smooth muscle contraction. D. The inflammatory response initiated by a viral or bacterial infection causes leakage of the alveolar-capillary membrane at the site of inflammation, causing a decrease in lung compliance and shortness of breath.

Correct Answer is C

Explanation

Choice A reason: While mucosal thickening and epithelial damage are part of asthma’s pathology, this description is incomplete and does not fully explain the mechanism of airway constriction. It omits the critical roles of smooth muscle contraction and mucus plugging, which are central to airflow limitation.

Choice B reason: This describes the pathophysiology of emphysema, a form of chronic obstructive pulmonary disease (COPD), not asthma. Emphysema involves destruction of alveolar walls and irreversible airflow obstruction, which is not characteristic of asthma.

Choice C reason: Asthma is a chronic inflammatory disorder of the airways characterized by variable and reversible airflow obstruction. The key mechanisms include infiltration of inflammatory cells (e.g., eosinophils, mast cells), mucus hypersecretion with plug formation, and bronchial smooth muscle contraction. These processes lead to narrowing of the airways and symptoms such as wheezing, dyspnea, and coughing.

Choice D reason: This describes the pathophysiology of acute respiratory distress syndrome (ARDS), not asthma. ARDS involves alveolar-capillary membrane damage and decreased lung compliance due to fluid leakage, which is unrelated to the bronchial hyperresponsiveness seen in asthma.

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A 25-year-old man complains of a sharp pain in the lower back. He has difficulty walking on his heels and has associated weakness in the extensors of the big toes. Which of the lumbar nerves is possibly associated with these symptoms?

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