Investigations were made on .serial sections of human embryos at developmental stage 23 (56 days). The oculomotor complex in embryos at this stage consists of lateral, median, and accessory nuclei. The lateral (chief) nucleus forms the greatest part of the oculomotor complex and it is subdivided into ventromedial and dorsolateral groups. Between the posterior portions of lateral nuclear groups is the median nucleus. Dorsally and medially to the lateral nucleus is the accessory (parasympathetic) nucleus.
Investigations were made on serial sections of human embryos at developmental stages 16 and 17 (37-41 days). The oculomotor nucleus in embryos at these stages is located at the cephalic flexure of the neural tube. It consists of paired lateral nucleus which is formed by well defined group of large neurons in the basal plate of the midbrain. Within the lateral nucleus two groups of cells (medial and lateral) can he distinguished. Posteriorly these groups unite and form a single nucleus.
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