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Chapter: Human Nervous System and Sensory Organs : Diencephalon

Frontal Section at the Level of the Mamillary Bodies

The section shows both thalami; their in-crease in volume has lead to secondary fu-sion in the median line, resulting in the in-terthalamic adhesion (B17).

Frontal Section at the Level of the Mamillary Bodies

The section shows both thalami; their in-crease in volume has lead to secondary fu-sion in the median line, resulting in the in-terthalamic adhesion (B17). Myelinated fiberlamellae, the medullary layers of thelies the anterior  nuclear  group  (B18), ven- trally to it the medial  nuclear  group  (B19), which borders medially on several small paraventricular nuclei (B20) and is laterally separated by the internal  medullary  layer (B21) from the lateral  nuclear  group  (B22).

Subdivision of the latter into a dorsal and a ventral area is less distinct. The entire com- plex is enclosed by a narrow, shell-shaped nucleus,  the  reticular  nucleus of the thalamus (B23), which is separated from the lateral nuclear group by the external medul- lary layer (B24). Ventrally to the thalamus lies the sub- thalamus with the zona incerta (B25) and the subthalamic nucleus (Luys’ body) (B26). The zona incerta is delimited by two myelinated fiber   plates, dorsally by Forel’s   field   H1 (thalamic  fasciculus) (B27) and ventrally by Forel’s  field  H2  (lenticular  fasciculus) (B28). Below the subthalamic nucleus appears the rostral pole of the substantia  nigra  (B29). The floor of the diencephalon is formed by the two mamillary bodies (B30). The mamil- lothalamic  fasciculus  (Vicq  d'Azyr’s  bundle) (B31) ascends from the mamillary body to the thalamus.

AB32 Corpus callosum.

A33 Amygdaloid body (amygdala).

B34 Hippocampus.

A35 Anterior commissure.

B36 Medullary stria.






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