01820nas a2200217   4500008004100000020001400041245011100055210006900166260000900235300001200244490000700256520107300263653005001336653003501386653007601421653002101497653001401518100001401532700001501546856004101561       1988                        eng d  a1122-949700aDigestion in spiders: histology and fine structure of the midgut gland of Coelotes terrestris (Agelenidae)0 aDigestion in spiders histology and fine structure of the midgut   c1988  a709-7180 v203 aThe fine structure of the midgut gland and its changes according to the nutritional state have been examined in the spider Coelotes terrestris (Agelenidae). In the epithelium of the midgut gland two types of cells are present: secretory cells and digestive cells. The epithelia are connected by an intermediate tissue. Secretory cells, characterized by great amounts of rER extrude enzyme containing granula into the lumen where extracellular digestion takes place. The digestive cells take up predigested food by pinocytosis and the resorbed nutrients are digested in nutritional vacuoles. Fat and glycogen originating from intracellular digestion in these vacuoles are stored in the intermediate tissue. Some nutritional vacuoles serve as an intracellular store in digestive cells. Metabolic wastes are collected in excretory vacuoles and extruded into the lumen. Histochemical examinations reveal that unspecific esterase and aminopeptidase seem to play an important role in digestive processes, whereas alkaline phosphatase is involved in transportation processes.10a/ / Midgut gland histology & ultrastructure].10aCoelotes terrestris (Araneae).10aCoelotes terrestris [Digestion / / Midgut gland role] [Digestive system10aDigestive system10aNutrition1 aLudwig, M1 aAlberti, G  u<Go to ISI>://ZOOREC:ZOOR12500053246