. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. RESPIRATION, ORGANS OF. fibres proceed, under a modified form how- ever, over the walls of the intercellular pas- sages and air-cells. The muscular and fibrous structures are discoverable in the walls of the bronchi "after these latter have penetrated within the bounds of the lobuli; but never the cartilaginous. This latter element, how- ever, exists in the walls of the smallest of the extra-lobular bronchi. The extreme end of each bronchus is the common mouth of the infundibulum of Rossig- nol; the peduncle of the
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. RESPIRATION, ORGANS OF. fibres proceed, under a modified form how- ever, over the walls of the intercellular pas- sages and air-cells. The muscular and fibrous structures are discoverable in the walls of the bronchi "after these latter have penetrated within the bounds of the lobuli; but never the cartilaginous. This latter element, how- ever, exists in the walls of the smallest of the extra-lobular bronchi. The extreme end of each bronchus is the common mouth of the infundibulum of Rossig- nol; the peduncle of the pulmonary vesicles of Reisseissen ; the origin of the interlobular passages of Addison. The bronchi divide on no constant or r»gii/tir plan. — Small branches sometimes proceed from a large stem, at different angles, from every point of its circumference. Fig. Diagram of portions of the human lung imperfectly injected with wax, exhibiting the mode in which the intercellular passages a, a, a, spring from the ultimate bronchi b, b. These are smooth-walled, those alveolated. {Original.') Frequently they multiply dichotomously (b, Jig. 210.) ; that is, a single tube divides into two of equal diameters. Sometimes the main bronchus exhibits a zigzag outline, the branches proceeding from the alternate angles. This latter method obtains with great con- stancy in the case of the intralobular bronchi. The number of branches within the lobule into which a bronchus subdivides bears a general proportion to the size of that lobule. In the smallest, the intercellular passages begin from two or three bronchial peduncles; in the largest, from eight or ten. In some instances a second or supplementary bronchus enters a lobule at the side. It is, however, the rule, that each lobule is supplied only with a single central bronchus. The point of attachment of the bronchus is the apex (a) of the lobule (b) ; the opposite point being the base. The angle of division in the bron- chial tree is,
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