chapter 14 gambar

Question 1

Questions 17-24
Match the description in items 17-24 with the appropriate lettered structure shown in the figure.

17. Paralysis of upward gaze
18. Loss of pain and temperature on the left side of the body
19. Deviation of the tongue to the left side and the uvula to the right side
20. Intention tremor on the right side
21. Complete third nerve palsy on the right side
22. Loss of vibration sensation in the right extremities
23. A Babinski sign on the left side
24. Lesion leads to terminal axonal degeneration in the right transverse gyrus of Heschl

Answer 1

17-B. Paralysis of upward gaze results from compression of the mesencephalic tectum by a tumor in the pineal region; this is called Parinaud syndrome.
18-C. Loss of pain and temperature on the left side of the body is due to a lesion on the right side of the lateral spinothalamic tract.
19-E. Deviation of the tongue to the left side results from transection of the right corticobulbar fibers (CN XII) located in the medial aspect of the crus cerebri. Deviation of the uvula to the right side results from transection of the right corticobulbar fibers (CN X) found in the medial aspect of the crus cerebri.
20-A. Transection of the left dentatothalamic tract results in an intention tremor on the right side. The dentatothalamic tract decussates in the caudal midbrain, below the level of this lesion.
21-E. A complete third nerve palsy on the right side results from transection of the oculomotor nerve fibers as they pass through the right side of the crus cerebri.
22-A. A loss of vibration sensation in the right extremities results from destruction of the left medial lemniscus.
23-E. A Babinski sign on the left side results from transection of the corticospinal tract withinthe middle three-fifths of the crus cerebri.
24-D. Destruction of the right medial geniculate body results in terminal axonal degeneration of the auditory radiation in the right transverse gyrus of Heschl.