The Puranics conceived the bronchial bronchial tree as a lotus having several sheaths or compartments. The innermost sheath (kosa) is not constituted of petals; rather like in typical flower anatomy, this central portion consists of the pericarp (karnika) of the lotus and the filaments (kesara) surrounding it. The principal bronchus, Meru, is that pericarp; alongwith the four lobar bronchi (conceived as its base (mula)). The segmental bronchi, that emerge from the secondary (lobar) bronchi, are the "filament mountains." The segmental bronchi are like compasses for the anatomist, serving to identify the various quarters (anatomical) of the lung [anterior, posterior, superior , lateral, medial pertaining to every lobe and division]. Each segment is an autonomous zone of the lung. There should be in total 20 segments, 10 on each side, but due to certain developmental peculiarities (fusion etc.) there are 18 in reality. The Puranics seem to have opted for 20 which is also okay from an idealized, theoretical point of view.
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