Question

Describe and draw a neat labelled diagram of the salivary Apparatus of cockroach? (S)

Answer 1

Morphology of the salivary glands in the cockroach Periplaneta americana a: Low-power micrograph of the salivary gland complex. The salivary glands are paired and consist of several lobes of secretory acini. The ducts (arrowheads) of each gland unite to a single efferent salivary duct (long arrows) that then fuses with the opposite duct to form the main salivary duct. Two reservoirs (asterisks) are associated with the secretory tissue. The reservoirs open into reservoir ducts (broad arrows) that accompany the efferent salivary ducts. b: Schematic representation of the structural organization of secretory acini. Each acinus consists of two peripheral cells with long microvilli and several central cells with numerous secretory granules. The apical surface of the central cells is covered by a sheath of flattened fenestrated centroacinar cells and by a thin discontinuous layer of cuticule. The central cells are stimulated only by serotonin, whereas the peripharal cells respond to dopamine and probably also to serotonin. The duct cells have basal and apical infoldings and are only responsive to dopamine. Scale bar = 2 mmEntire salivary glands were isolated, fixed for 2 h in 0.1% (w/v) glutaraldehyde, 3% (w/v) paraformaldehyde, 0.2% (w/v) picric acid, 0.2 M sucrose in 0.1 M Naphosphate buffer (pH 7.4), and processed for immunofluorescence labeling as described previously (Baumann et al., 2002). Brains were fixed for 2 h in 3% (w/v) paraformaldehyde, 0.075 M L-lysine HCl, 0.01 M sodium periodate, 0.2 M sucrose in 0.1 M Na-phosphate buffer (pH 7.0). ...

Answer 2

the first part of the salivary gland of the cockroach is the glandular portion which secretes the glands in the required amount to be used at the time. then comes the receptacle which is the primary storage organ of the cockroach that can store a large amount of the saliva. then the duct of reservior is that which gets saliva from the receptacle. duct of salivary gland brings secretions.