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Updated: Apr 23, 2026
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Ex Vivo Oculomotor Slice Culture from Embryonic GFP-Expressing Mice for Time-Lapse Imaging of Oculomotor Nerve Outgrowth
Published on: July 16, 2019
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Development of the human oculomotor nuclear complex: somatic nuclei
1Department of Pathology, Dokkyo University School of Medicine, 880 Kitakobayashi, Mibu 321-0293, Tochigi, Japan.
Summary
Human oculomotor somatic nuclei (OSN) show four subnuclei by mid-gestation. The principal nucleus exhibits distinct neuronal cytoarchitecture compared to other OSN subnuclei during development.
Area of Science:
- Neuroscience
- Developmental Biology
- Human Anatomy
Background:
- Precise anatomical data on human oculomotor somatic nuclei (OSN) development are scarce.
- Understanding OSN development is crucial for comprehending neurodevelopmental disorders.
Purpose of the Study:
- To histologically describe the development of human oculomotor somatic nuclei (OSN).
- To quantitatively evaluate the growth and cytoarchitecture of OSN subnuclei during fetal development.
Main Methods:
- Histological analysis of 11 human fetal specimens (20-43 postmenstrual weeks).
- Staining techniques included Klüver-Barrera and silver impregnation.
- Morphometric analysis of nuclear volume and neuronal area.
Main Results:
- Four OSN subnuclei identified by 20-21 weeks: fascicular, principal, dorsal median, and ventral median.
- Neuronal maturation (Nissl bodies) observed by 27-28 weeks.
- OSN nuclear volume increased exponentially, while neuronal area increased linearly with age; principal nucleus showed largest growth and distinct neuronal size.
Conclusions:
- Four human OSN subnuclei are distinguishable by mid-gestation.
- The principal nucleus demonstrates unique neuronal cytoarchitecture compared to other OSN subnuclei.
- These findings provide foundational data for human OSN development.
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