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Abstract The innervation of the human bronchial tree is still poorly understood, and few data a~e available on its structural alteration in disease. (Laitenen A., 1985). The vagus nerve includes affe’ent fibres f’om senso’y receptors in the bronchial epithelium, stimulation of these receptors by irritants can initiate a reflex impulse along vagal efferents, causing release of acetylcholine and bronchoconstriction. (Roberts AM, etal., (1981). Bronchial glands are also under parasympathetic control and vagal stimulation can also lead to mucus secretion. The vagal efferent nerves end in ganglia close to bronchial smooth muscle 1n the posterior wall of the larger ai•ways. The post synaptic fibres a•e short and connect with ~uscle and g;ands. (Nadel JA, 19°9:’. Excessive |