ATI LPN
Medical-Surgical Nursing Neurological System Questions
Question 1 of 5
The nose of a rat is:
Correct Answer: B
Rationale: Anterior refers to the front (nose) in anatomical terms. [Level: Knowledge]
Question 2 of 5
Which of the following best describes an expanded tip tactile receptor found in the dermis of hairy skin that is specialized to detect continuously applied touch sensation?
Correct Answer: B
Rationale: Merkel discs are slow-adapting, expanded tip receptors in hairy skin dermis, detecting continuous touch. TMP13 p. 608
Question 3 of 5
A physiology experiment is conducted in which a glass microelectrode in inserted into a Pacinian corpuscle to record receptor potentials during different levels of stimulation (from 0 percent to 100 percent). Increasing stimulus strength from 10 percent of maximum to 30 percent of maximum causes a 40 percent increase in the amplitude of the receptor potential. Increasing the stimulus potential from 70 percent of maximum to 90 percent of maximum is most likely to cause which increase in the amplitude of the receptor potential (in percent)?
Correct Answer: A
Rationale: Pacinian corpuscles show greater receptor potential increases at lower stimulus strengths; at higher strengths (70-90%), the increase is smaller (10%). TMP13 pp. 597-598
Question 4 of 5
Which body part is represented superiorly and medically within the postcentral gyrus?
Correct Answer: B
Rationale: The lower limb is represented superiorly and medially in the postcentral gyrus somatosensory map. TMP13 p. 612
Question 5 of 5
Which somatosensory deficit is NOT typically seen after the development of lesions that involve the postcentral gyrus?
Correct Answer: D
Rationale: Postcentral gyrus lesions impair sensation, not motor function (precentral gyrus). TMP13 p. 613