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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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late gyrus and isthmus, and the parahippocampal gyrus, which
includes the uncus (see Figure 1-4).
-contains, buried in the parahippocampal gyrus, the hippocampal
formation and the amygdaloid nuclear complex.
6. Hippocampal formation (Figure 20-4)
-functions in learning, memory, and recognition of novelty,
-receives major input via the entorhinal cortex, -projects
major output via the fornixa. . Major structures of the
hippocampal formation
—project output via the fornix to the septal area and the mamillary
nuclei.
_)---------Fornix
Figure 20-4. Limbic connections. Major afferent and
efferent connections of the hippocampal formation. The
circuit of Papez is: hippocampal formation -> mamillary
nucleus -> anterior thalamic nucleus -> cingulate
gyrus -> hippocampal formation. The hippocampal
formation consists of three components: the hip-
pocampus per se (cornu ammonis), the subiculum,
and the dentate gyrus. The hippocampus projects to
the septal area; the subiculum projects to the mamil-
lary nuclei; and the dentate gyrus does not project
beyond the hippocampal formation.



--------------------------------------- 233

Chapter 20 Olfactory, Gustatory, and Limbic Systems I 309
—receive input via the fornix from the septal are a.
-receive input via the entorhinal cortex (area 28) as the alvear
pathway to the hippocampus and the perforant pathway to the
dentate gyrus.
(1) Dentate gyrus (see Figure 1-4)
-has a three-layered archicortex.
-contains granule cells that receive hippocampal input and
project it to the pyramidal cells of the hippocampus and
subiculum.
(2) Hippocampus (cornu ammonis)
-has a three-layered archicortex.
-contains pyramidal cells that project via the fornix to the
septal area and the hypothalamus. -is divided into four
cytoarchitectural areas (CA1-CA4); CA1
(Sommer sector) is especially vulnerable to hypoxi a.
(3) Subiculum
-receives input via the hippocampal pyramidal cells, -projects
via the fornix to the mamillary nuclei and the anterior nucleus
of the thalamus.
b. Major afferent connections to the hippocampal formation
(1) Cerebral association cortices (areas 19, 22, and 7)
(2) Septal area
(3) Anterior nucleus of the thalamus, via the cingulate gyrus,
cingulum, and entorhinal cortex
c. Major efferent connections from the hippocampal formation
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