Morphological studies on the development of the tracheal cartilage in the Korean native cattle fetus

Lee, Young-hoon; Kim, In-shik; Yang, Hong-hyun; Paik, Young-ki

Korean Journal of Veterinary Research 1997;37(1):15-24.

Young-hoon Lee, In-shik Kim, Hong-hyun Yang, Young-ki Paik

Colleg of Veterinary Medicine, Chonbuk National University

한우태자의 기관연골 발생에 관한 형태학적 연구

이영훈, 김인식, 양홍현, 백영기

전북대학교 수의과대학

Abstract

This study was undertaken to obtain basic data on the histological changes in the tracheal cartilage of the embryos and fetuses of the Korean native cattle. Twenty-two embryos and fetuses of the Korean native cattle, ranging from 30mm(peesumptive fetal age 44 days) to 440mm(presumptive fetal age 168 days) in crown-nump(C-R) length, were used for present study. The results were summerized an follows; 1. Mesenchymal cells differentiated as chondroblasts were condensed into tracheal cartilage in the CRL 30mm of the Korean native cattle embryo, and the chondrocytes begun to appear in the tracheal cartilage in the CRL 40mm fetus. 2. The tracheal cartilage in the CRL 70mm fetus was composed of the large number of chondrocytes. The histochemi8cal reactions for glycosaminoglycans showed strong positive reaction in the CRL 380mm, and for collagen substance showed mildly in the 6th experimental group.

Key Words: cattle fetus, Tracheal cartilage, chondrogenesis, histochemistry