Baskin D G, Detmers P A
Cell Tissue Res. 1976 Feb 12;166(2):167-78. doi: 10.1007/BF00227038.
Both primary and secondary (tongue) bars of the pharyngeal gill basket are covered by epithelial cells that are continuous with the cells that line the atrium. Anterior and posterior faces of the gill bars are covered with lateral ciliated cells, which possess a single cilium, ringed by microvilli, and an elaborate basal mitochondria-rootlet apparatus. Pharyngeal faces of the gill bars are covered with ciliated pharyngeal cells, atrial faces by mucus secreting atrial cells. The surface epithelium rests on a stromal septum, a flattened tube of basal lamina which dilates to form the visceral blood vessel (along the pharyngeal face) and skeletal blood vessel (along the atrial face). This basal lamina surrounds paired skeletal rods which run through the longitudinal axis of the gill bars near the atrial face. Between the skeletal rods and atrial cells of primary gill bars is a coelomic channel lined by epithelioid coelomic cells. Neuronal processes, some with neurosecretory granules, are located among the bases of the atrial cells. Some axons may contact lateral ciliated cells where the latter meet atrial cells, but synaptoid endings have not been found here or elsewhere in the gill bars. Nervous tissue has not been identified among lateral ciliated cells even though ciliary activity of these cells is supposedly regulated by atrial nervous tissue.
咽鳃篮的初级和次级（舌）鳃弓均由上皮细胞覆盖，这些上皮细胞与心房内衬的细胞相连。鳃弓的前表面和后表面覆盖着外侧纤毛细胞，这些细胞具有一根纤毛，周围环绕着微绒毛，还有一个复杂的基部线粒体 - 根丝装置。鳃弓的咽面覆盖着纤毛咽细胞，心房面则覆盖着分泌黏液的心房细胞。表面上皮位于基质隔膜上，基质隔膜是一层扁平的基膜管，它会扩张形成内脏血管（沿着咽面）和骨骼血管（沿着心房面）。该基膜围绕着成对的骨骼杆，这些骨骼杆在靠近心房面的鳃弓纵轴上穿行。在初级鳃弓的骨骼杆和心房细胞之间是一个由类上皮体腔细胞衬里的体腔通道。神经突起，有些带有神经分泌颗粒，位于心房细胞基部之间。一些轴突可能在外侧纤毛细胞与心房细胞相遇的地方与之接触，但在这里或鳃弓的其他地方尚未发现突触样末梢。即使这些细胞的纤毛活动据推测受心房神经组织调节，但在外侧纤毛细胞中尚未鉴定出神经组织。
