1. The laminar pattern and distribution of cell body area has been studied in the lateral geniculate nucleus of man.2. When the lateral geniculate nucleus is sectioned at right angles to the dorsal crest, the laminar pattern is noteworthy in the following respects: a. except for tin1 rostral and caudal poles, and the lateral horn, there are 6 distinct laminae which show no evidence of fusing medially; b. the 6 laminae are separate in the median rhomboid-shaped area and the medial portion of the nucleus. In as much as laminae 5 and 6 do not extend into the lateral horn, the latter is formed by laminae 1, 2, 3 and 4; and e. since laminae 5 and 6 drop out at the caudal portion of the posterior third of the nucleus, there are only 4 laminae at the caudal pole.i.e.laminae 1,2,3 and 4.3. There is no regular gradient of cell body area from lamina to lamina and the neurons of each lamina have a unimodal distribution with respect to cell body area. In addition, the mean cell body areas of laminae 3 and 5 taken together exceed that of laminae 4 and 6 together.
展开▼
