ATI RN
Pediatric Neurology Test Questions Questions
Question 1 of 5
Select the incorrect statement:
Correct Answer: C
Rationale: The dura mater end in the second lumbar vertebra , which is incorrect. The dura mater extends to the S2 level in adults, not L2, forming the dural sac. ChoicA, B, and D are correct: at three months fetal age, the spinal cord spans the vertebral canal; at birth, it ends around L3; and postnatally, the vertebral column grows faster, causing the cord to end at L1-L2 in adults. Choice C inaccurately statthe dura mater ends at L2, which is too high; it actually terminatat S2, making C the incorrect statement and thus the correct answer to this select the incorrect question.
Question 2 of 5
Wrong about disk on L4 root:
Correct Answer: C
Rationale: It is the most common disk . Herniation at the L4 root (typically L3-L4 disc) affects the L4 nerve, impacting knee jerk (via quadriceps, A), sensation in the anteromedial leg , and knee extension , all correct. However, the most common disc herniation is at L5-S1, not L3-L4 or L4-L5, due to greater mechanical stress lower in the spine. Thus, C inaccurately claims L4 is the most common site, making it the wrong statement and the correct answer.
Question 3 of 5
A 40 years old worker suffered from lower back pain in the gluteal region, physical examination revealed a sensory defect in the anterolateral aspect of his leg. Also, the patient cant stand on his heels. The patient has a herniated disc in what region:
Correct Answer: B
Rationale: L4-L5 . The symptoms gluteal pain, sensory loss in the anterolateral leg, and inability to stand on heels (weak tibialis anterior) indicate L5 nerve root compression, most commonly from an L4-L5 disc herniation. Choice A (L3-L4) affects L4, causing medial leg sensory loss and knee weakness. Choice C (L5-S1) affects S1, causing posterior leg/calf issuand tiptoe weakness. Choice D (S1-S2) affects S2, unrelated to these symptoms. Thus, L4-L5 matchthe L5 root symptoms, making B correct.
Question 4 of 5
Lamina 3 and 4 of grey matter of spinal cord contains:
Correct Answer: C
Rationale: Nucleus proprius . Laminae III and IV of the spinal cord gray matter contain the nucleus proprius, which processsensory input like fine touch and pressure, relaying it to ascending pathways. Choice A (intermedio-medial nucleus) is in lamina VII, for visceral functions. Choice B (intermedio-lateral nucleus) is in lamina VII (T1-L2), for sympathetic neurons. Choice D (substantia gelatinosa) is in lamina II, for pain and temperature. Thus, C correctly identifithe nucleus proprius in laminae III-IV, making it the right answer.
Question 5 of 5
All of the following statements apply to first order neurons that transmit discriminative tactile sensations from the arm EXCEPT:
Correct Answer: C
Rationale: They form internal arcuate fibers as they decussate , which is false for first-order neurons. In the dorsal column pathway, first-order neurons from the arm (pseudounipolar, D) ascend in the fasciculus cuneatus and synapse in the nucleus cuneatus . Second-order neurons from the nucleus cuneatus form internal arcuate fibers and decussate. Choice C attributthis to first-order neurons, which dont decussate they end in the medulla. Thus, C is the exception, making it the correct answer.