00178062

open access

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ニワトリ ノ ヨクジョウコツ ニオケル レンケツブ ノ ソシキ ケイセイ

Histological Study on the Development of Articulations in the Chick Pterygoid

Japanese (日本語)

神戸大学農学部研究報告

22(1)

1-6

神戸大学農学部

1996-01-30

2006-09-15

本文ファイルは、国立情報学研究所CiNiiより提供されたものです。

The development of articulations in the pterygoid of White Leghorn chick, and of adventitious cartilages associated with them, was histologically studied at different periods of incubation and posthatching. At 10 days of incubation, the pterygoid ossification center was recognizable within a connective tissue sheath. The pterygoid was at first a rod-like condensation of mesenchyme within the sheath and became a hollow bony tube as the age of the embryo advanced. Later, this membrane bone articulated at its medial end with the parasphenoid and also with the palatine and at its laterodistal end with the quadrate. In 11-day-old embryo, the articulation of the pterygoid showed definitely recognizable young adventitious cartilage. The changes between 14 days of incubation and the day of hatching included an enlargement of the articular face of the pterygoid, causing its articulation to be more extensive, and further development of the articular cavity. Growth of the adventitious cartilage on the pterygoid continued at least until before hatching. With advancing age after hatching, the articular cartilage of the pterygoid at its articulation with the parasphenoid became progressively more prominent. The nodules of adventitious cartilage which underlay the articular cartilage in the embryo were small in the hatched chick. In 5-day-old chick, a small amount of adventitious cartilage was still present on the pterygoid at its articulation with the quadrate. There was no such articular cartilage at the pterygoid-palatine articulation as was so prominent between the pterygoid and the parasphenoid. In 3-week-old chick, the pterygoid-parasphenoid articulation has increased in overall size but there was little change in the thickness of the articular cartilage. Where there were articular cavities, fibrous membranes lining the articulations appeared on each side of the cavity and these usually became fibrocartilaginous. The fibrous articular membrane of the pterygoid at its articulation with the palatine was much thicker than that in the 5-day-old chick. The adventitious cartilage of the pterygoid was partially replaced by bone and at the articular surface by a fibrocartilage which formed the adult articular cartilage.

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