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Board Review Series - Fix J.D.

Fix J.D. Board Review Series - London, 1995. - 430 p.
Download (direct link): boardreviewseries1995.djvu
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pain control.
d. Dorsal nucleus of raphe
-contains serotonergic neurons.
8. Trochlear nucleus of CN IV (see Figure 9-8)
-gives rise to GSE fibers, which encircle the periaqueductal gray mat-
ter, decussate in the superior medullary velum, and exit the midbrain
from its dorsal aspect to innervate the superior oblique muscle.
9. Medial longitudinal fasciculus
Ścontains vestibular fibers that coordinate eye movements, -
interconnects the ocular motor nuclei of CN III, CN IV, and CN VI.
10. Decussation of the superior cerebellar peduncles (see Figure 9-8)
-is the most conspicuous structure of this level.
11. Interpeduncular nucleus
-receives input from the habenular nuclei via the habenulointerpedun-
cular tract (fasciculus retroflexus of Meynert).

--------------------------------------- 65

Chapter 9 Brainstem I 157
12. Substantia nigra (see Figures 9-8 and 9-9)
-is divided into the dorsal pars compacta, which contains large pig-
mented (melanin) cells, and the ventral pars reticularis. -receives
GABAergic input from the caudatoputamen (striatonigral
fibers), -projects dopaminergic fibers to the caudatoputamen
fibers), -projects nondopaminergic fibers to the ventral anterior
nucleus, the
ventral lateral nucleus, and the centrum medianum of the thalamus
(nigrothalamic fibers).
13. Medial lemniscus
Śmediates dorsal column modalities to the ventral posterolateral
14. Spinal lemniscus
-contains the lateral and ventral spinothalamic tracts and the spino-
tectal tract.
15. Central tegmental tract
Ścontains rubro-olivary and reticulothalamic fibers.
16. Basis pedunculi (crus cerebri) [see Figures 9-8 and 9-9]
D. Superior collicular level of the midbrain (see Figure 9-9)
1. Superior colliculus
-receives visual input from the retina and from frontal (area 8) and
occipital (area 19) eye fields.
-receives auditory input from the inferior colliculus to mediate audiovi-
sual reflexes.
-is concerned with detection of movement in visual fields, thus facili-
tating visual orientation, searching, and tracking.
2. Commissure of the superior colliculus
-interconnects the two superior colliculi.
3. Brachium of the superior colliculus
Śconducts retinal and corticotectal fibers to the superior colliculus and
to the pretectum, thus mediating optic and pupillary reflexes.
4. Cerebral aqueduct and periaqueduct gray matter
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