Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Development of the Central Nervous System in the Wolf Spider Arctosa kwangreungensis (Araneae: Lycosidae)

광릉늑대거미(Arctosa kwangreungensis) 중추신경계 발생에 관한 연구

  • 양성찬 (단국대학교 생명과학과) ;
  • 문명진 (단국대학교 생명과학과)
  • Received : 2012.05.18
  • Accepted : 2012.06.25
  • Published : 2012.06.30
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Abstract

The morphological and histologic differentiation of the central nervous system (CNS) in the wolf spider Arctosa kwangreungensis with respect to postembryonic development are studied using light and scanning electron microscopes. The organization of CNS which consisted of supraesophageal ganglion (SpG) and subesophageal ganglion (SbG) are established prior to the postembryo stage. The brain of first instar spiderling after a molt of the postembryo is also made up of supraesophageal ganglion and subesophageal ganglion. Although development of the optic nerve and optic lobe in SpG are not completed during the postembryoic stage, completion of whole neural system resemble to that of adult are established during the second instar stage. In particular, optic gangalion is developed from the undifferentiated cell clusters of the SpG, moreover four pairs of appendage ganglia and another pairs of abdominal ganglia are produced from the SbG. Nerve cells of the most developing stages are composed of typical monopolar neur1ons, and total three types of neurons can be identified through the histological and morphological basis of present study. These cell clusters are differentiated into neurons and grow dendritic fibers according to further development of the CNS.

배회성거미류인 광릉늑대거미(Arctosa kwangreungensis)를 실험재료로 배후발생에 따른 거미 중추신경계의 형태적 분화와 그 조직학적 변화를 관찰하였다. 식도를 중심으로 위쪽의 식도상신경절과 아래쪽의 식도하신경절이 서로 연결된 구조를 지닌 광릉늑대거미의 중추신경계는 부화가 이루어지는 후기배아 시기 이전에 확립되었고, 전대뇌(protocerebrum) 영역도 구분되었다. 후기배아 단계에서는 시각정보를 수용하는 시엽(optic lobe)의 발달이 미진하였으나 알주머니를 벗어나 본격적인 먹이활동을 시작하는 제2령 시기를 전후하여 성체와 동일한 신경계의 체제가 구축되었다. 후기배아 시기에 관찰된 식도상신경절의 미분화 세포들로부터 시각기 신경절이 발생되었고, 식도하신경절에서는 네 쌍의 부속지 신경절과 복부 신경절이 분화되었다. 또한, 발생 중인 유충의 중추신경계에서는 조직학적 특성이 다른 세 유형의 신경세포들이 관찰되었고, 발생단계에 따라 이들 세포집단의 이동과 분포상의 차이가 확인되었다.

Keywords

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