part_of adult salivay gand type I acinus adult salivary gland type II acini adult salivary gland type III acini adult salivary gland peritubular cell Cells reponsible for secreting the intralobular acinar duct. In type I acini, the acinar duct is extremely short and leads directly into the main salivary duct. Thus the agranular type I acini appear to communicate directly with the main salivary duct. In the type II and type III acini, the acinar duct is bifurcated and communicates with the secondary ducts, not the main salivary duct. Fig. 8-5, in Biology of Ticks ISBN:0-19-505910-7. Neck cells TADS:0000134 TADS:0000134 default_namespace cell