. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1498 VOICE. forms the boundary : the rest of this cavity is composed of bone. On the left side the larynx is furnished with four membranes, of unequal dimensions, which are inclined to each other at different angles ; of these membranes three are lateral, and the fourth forms the base. The internal lateral membrane b lies almost parallel to the superior promontory of the os transversale i, from which it is separated by a channel, leading from the left to the right larynx .* Through this channel the air from the left bron
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1498 VOICE. forms the boundary : the rest of this cavity is composed of bone. On the left side the larynx is furnished with four membranes, of unequal dimensions, which are inclined to each other at different angles ; of these membranes three are lateral, and the fourth forms the base. The internal lateral membrane b lies almost parallel to the superior promontory of the os transversale i, from which it is separated by a channel, leading from the left to the right larynx .* Through this channel the air from the left bronchus must pass to reach the trachea. The internal lateral membrane has a free salient edge inferiorly, over which the air brushes in its passage from the lungs to the The posterior, anterior, and lateral mem- branes are supported by bony rings, of which the anterior is the largest. The membrane forming the base is penetrated by the left bronchial tube, and is connected with several of the bronchial rings through the medium of the membrana tympaniforrnis. Thus the air from the lungs throws into vibration one large membrane in the right, and four in the left laiynx, all of unequal dimensions, and con- stituting a very complex piece of mechanism. In the M. Merganser or Goosander the inferior larynx is most developed on the left side h (Jiff. 916), which is chiefly mem- branous, while the other side d is composed principally of bone. On the left side there are four irregular membranes, a, b, c, supported Fig. Two views of the Inferior Larynx of the Mergus Serrutor. by bones, and that on the external ring h. The os transversale is very small and does not reach the free edge of the internal mem- brane b, which is similar to that of the Atergns serrafor, thus leaving a communi- cation open between the right and left side of the cavity of the larynx, through which the air from the left lung must pass to reach the tube of the trachea, which terminates on the superior pa
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