Exam 9: Sensory Receptors and the Peripheral Nervous System

A 35-year-old roofer is examined in the emergency department after falling two stories and landing abdomen first on a barrel. Examination reveals weakness and loss of pain and temperature sensation in the left and right lower limbs. A magnetic resonance image indicates thrombosis of an artery in the abdomen. Which of the following arteries is most likely involved?

A 58-year-old woman complains of left hand weakness that she noticed while planting flowers in her garden. Neurological examination indicates weak wrist and finger flexion and extension. She also has weakness when abducting, adducting, and opposing her thumb. All other motor and sensory tests are normal. The combined deficits in this patient can most accurately be attributed to a lesion in which of the following?

Lesions rostral to the red nucleus result in which of the following?

A 24-year-old woman is brought to the emergency department from the scene of a motor vehicle collision. A neurological examination reveals that her tongue deviates to the left on protrusion and that she is unable to raise the right corner of her mouth when asked to smile. In addition, she is unable to move the entire right side of her body. Which of the following represents the most likely location of a lesion?

A 32-year-old woman visits her dermatologist several days before her wedding for botulinum toxin injections around her eyes. What effect does this toxin have on the neuromuscular junction?

A 53-year-old man complains to his family physician of cramping, twitching, and weakness in his lower limbs. The man states that the weakness in his lower limbs has progressively worsened over the past 4 months, making it difficult for him to climb stairs and stand from a seated position. He has also begun to notice that his upper limbs have become weak. What is the most likely cause of this patient's weakness?

A 52-year-old woman unable to move her left leg visits your office. Sensory modalities in all of her limbs are retained and there appears to be no sign of weakness in any of her other limbs. In which of the following structures are the cell bodies of lower motor neurons innervating the lower limb located?