이태아 서비기의 발생에 대하여
The Development of the Vomeronasal organ in the Humanl Fetus
김선헌, 황인남,
소속 상세정보
김선헌 ( ) - 전남대학교
황인남 ( ) - 전남대학교
KMID : 0355819950190010013
Abstract
The development of the vomeronasal organ was observed in the human fetus ranging from 40mm to 250mm crown-rump length.
The vomeronasal organ was a bilateral tubular formation integrated by the vomeronasal cartilage at 40mm fetus. It was located in the anteroinferior part of the nasal septum, just above the floor of the nasal cavity. It was communicated with the
nasal
cavity anteriorly and ended in blind pouch posteriorly. The organ consisted of stratified columnar epithelium which was surrounded by connective tissue near the nasal septal and the vomeronasal cartilage.
The vomeronasal epithelium at 90mm to 130m was separated from adjacent connective tissue by basal lamina and consisted of 3 different types of cell according to their ultrastruclture. Type I cells wer most numerous and characterized by having no
microtubules and centrioles in the apical cytoplasm. Type II cells were characterized by containing numerous microtubules and several centrioles in the apical cytoplasm and regarded as analogy of neurosensory epithelial cells. Type III cells were
small
basal cells in the basal region. Occactionally nerve fibers and axons were observed in the basal region of the vomeronasal organ and adjacent connective tissue.
Type II cells had notable changes at 200mm fetus. The cells showed expanded surfaces that protruded into the lumen and had one to two cilia at the free border. And there wee no remarkable change in the other types of cell, but degenerating type
II
cells
were observed frequently.
At 250mm fetus, most of the vomeronasal organ was degenerated and replaced by connective tissue. The anterior opening of the organ consisted of ciliated, nonciliated, goblet and basal cells.
These results suggested that the human vomeronasal organ may be temporary neurosensory organ in fetal period.
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