The pathway of which system crosses in the ventral white commissure of the spinal cord within a few segments of entry and then courses to the thalamus contralateral to the side of the body from which the signal originated?

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Question 1 of 5

The pathway of which system crosses in the ventral white commissure of the spinal cord within a few segments of entry and then courses to the thalamus contralateral to the side of the body from which the signal originated?

Correct Answer: A

Rationale: The anterolateral system crosses in the ventral white commissure near entry, ascending contralaterally. TMP13 pp. 616-617

Question 2 of 5

An input neuron to a diverging circuit causes the membrane potential of a target neuron to change from -65 millivolts to -55 millivolts. Which of the following best describes this change in membrane potential (in millivolts)?

Correct Answer: A

Rationale: A depolarizing shift from -65 to -55 mV is an excitatory postsynaptic potential of +10 mV. TMP13 p. 588

Question 3 of 5

A 53-year-old woman with celiac disease visits the physician because of difficulty seeing at night. The woman has frequent, foul-smelling stools. Stool analysis reveals a high content of partially digested fat. A decrease in blood levels of which of the following is the most likely cause of her night blindness?

Correct Answer: D

Rationale: Vitamin A malabsorption in celiac disease reduces rhodopsin synthesis, causing night blindness. TMP13 pp. 648-649

Question 4 of 5

A 40-year-old woman is admitted emergently to the hospital because of sudden, severe pain in her right eye. Tests show an intraocular pressure of 30 mm Hg in her right eye; the intraocular pressure of her left eye is 15 mm Hg. Which of the following is the most likely cause of eye pain in this woman?

Correct Answer: A

Rationale: Acute angle-closure glaucoma causes sudden, severe pain with high intraocular pressure due to angle closure. TMP13 p. 646

Question 5 of 5

Loss of which structure is most likely to contribute to the hearing deficit?

Correct Answer: B

Rationale: Noise-induced hearing loss primarily damages inner hair cells, the sensory receptors. TMP13 pp. 682, 683

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