Braekevelt C R
Department of Anatomy, University of Manitoba, Winnipeg, Canada.
Ophthalmologica. 1988;196(3):151-9. doi: 10.1159/000309892.
The pecten oculi of the diurnally active pigeon (Columba livia) has been examined by light and electron microscopy. In this species the pecten is of the pleated type. It is situated over the optic nerve head and extends out into the vitreous. Fifteen to 17 accordion folds are joined apically by a heavily pigmented ridge of tissue which holds the pecten in a fan-like shape, widest at the base. The entire pecten is enclosed by a fine basal lamina. Within each fold are numerous capillaries, larger blood vessels and melanocytes. The capillaries are surrounded by thick fibrillar basal laminae which often contain pericytes. These capillaries display numerous microfolds on both the luminal and abluminal borders. The endothelial cell body is extremely thin with most organelles present in a paranuclear location. The melanocytes which are more plentiful in the bridge region form an incomplete sheath around the capillaries and other blood vessels. The morphology of the pecten in the pigeon is indicative of a heavy involvement in the transport of materials.
通过光学显微镜和电子显微镜对昼行性活动的鸽子（家鸽）的栉膜进行了检查。在这个物种中，栉膜是褶皱型的。它位于视神经乳头上方，并延伸到玻璃体中。15到17个手风琴状褶皱在顶端由一条色素沉着很重的组织嵴连接在一起，该组织嵴将栉膜保持成扇形，基部最宽。整个栉膜被一层精细的基膜所包围。在每个褶皱内有许多毛细血管、较大的血管和黑素细胞。毛细血管被厚厚的纤维状基膜包围，基膜中常常含有周细胞。这些毛细血管在管腔和管腔外边界上都有许多微褶皱。内皮细胞体极其薄，大多数细胞器位于核旁位置。在桥区域更丰富的黑素细胞在毛细血管和其他血管周围形成不完整的鞘。鸽子栉膜的形态表明其在物质运输中发挥着重要作用。
