The oculomotor nuclear complex at the end of the embryonic period (stage 23)

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.