. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. VOICE. 1497 seven rings of the trachea. It is divided within into two unequal cavities by the os Fig. 914. 2. 1. wards perpendicularly to the axis of the the developement and union of the last six or bonchus of the same side, by which means the area of the latter is varied. The third bone is but very slightly curved (r). It is separated from the second bone by a triangular membrane; having its extremities articulated to the second bone by ligaments which permit of an extensive freedom of mo- tion, particularly of a rotat
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. VOICE. 1497 seven rings of the trachea. It is divided within into two unequal cavities by the os Fig. 914. 2. 1. wards perpendicularly to the axis of the the developement and union of the last six or bonchus of the same side, by which means the area of the latter is varied. The third bone is but very slightly curved (r). It is separated from the second bone by a triangular membrane; having its extremities articulated to the second bone by ligaments which permit of an extensive freedom of mo- tion, particularly of a rotatory movement on its axis, and it is an important agent, accord- ing to Savart, in modulating the voice. The internal surface of this bone is lined with a fibrous cord which forms the external lip of the glottis. The posterior extremities of these three bones are not united, but have a triangular space between them for the passage of the oesophagus. Fis. 913. a. Inferior Larynx of the Haven, Shewing the three bones, a, b, c. The Membrana tympaniformis.— This is a thin transparent membrane, extending from the os transversale to the extremities of the bronchial half-rings g (figs. 912 and 914) : it forms the internal surface of the larynx and bronchi, and is a continuation of the semilunar membrane; so that the tympaniform and semilunar membranes are stretched simul- taneously, and the latter is acted upon through the instrumentality of the former. The Arytenoid Cartilage. — This is a small body situated at the head of the second bone: it is described by Savart as being of a lozenge shape in the starling, but very short in the nightingale. This form of larynx in the Cor- vidae and Sylviadae is provided with six pairs of muscles.* ( See/g. 914.) Palmipedes. — In the genera Anas and Mergus the inferior larynges of the males only are unsymmetrical, and composed of bony ca- vities. In the Anas domesticus, the inferior larynx presents osseous cavities formed by * These muscles a
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