Noaillac-Depeyre J, Gas N
Anat Rec. 1979 Dec;195(4):621-7. doi: 10.1002/ar.1091950405.
An ultrastructural study of the intestinal absorptive epithelium in perch (Perca fluviatilis) has shown that the perch intestine can be divided into three segments: the proximal segment, the middle segment and the distal segment. The enterocytes of the proximal segment are found to be concerned with lipid absorption. The adsorbed fat gives rise to the presence of two forms of inclusions: lipid particles and lipid droplets. Enterocytes of the middle segment exhibit the typical ultrastructural features of pinocytosis; these consist of extensive invaginations of the luminal surface membrane and acculation of vacuoles in the apical cytoplasm. Exogenous proteins are ingested by absorptive cells from the intestinal lumen by a process similar to that described in neonatal mammals. In the distal segment the absorptive cells have few, short microvilli. Besides the absorptive epithelial cells, goblet cells, endocrine cells, pear-shaped cells, and plasma cells are occasionally found.
对鲈鱼（河鲈）肠道吸收上皮的超微结构研究表明，鲈鱼肠道可分为三段：近端段、中段和远端段。已发现近端段的肠上皮细胞与脂质吸收有关。吸附的脂肪导致出现两种形式的内含物：脂质颗粒和脂滴。中段的肠上皮细胞表现出典型的胞饮超微结构特征；这些特征包括腔面膜的广泛内陷以及顶端细胞质中液泡的积累。外源性蛋白质通过与新生哺乳动物中描述的过程相似的方式被吸收细胞从肠腔摄入。在远端段，吸收细胞有很少且短的微绒毛。除了吸收上皮细胞外，偶尔还会发现杯状细胞、内分泌细胞、梨形细胞和浆细胞。
