. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. A B A, an anterior, B, the side view of the cricoid cartilage; a, the posterior superior margin -, b, b, the crico-arylenoid articulating surface; b,g,f,e, the superior descending margin ; d, e, the trachea! aperture of the cricoid ; a, d, the greatest, a, e, the least depth of surface ; a, e, the obliquity of the superior section to the axis ; h, the left surface articulating with the inferior cornua of the thyroid cartilage. The anterior external surface gives attach- ment to the crico-thyroid muscles (seeJig. 26); mor
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. A B A, an anterior, B, the side view of the cricoid cartilage; a, the posterior superior margin -, b, b, the crico-arylenoid articulating surface; b,g,f,e, the superior descending margin ; d, e, the trachea! aperture of the cricoid ; a, d, the greatest, a, e, the least depth of surface ; a, e, the obliquity of the superior section to the axis ; h, the left surface articulating with the inferior cornua of the thyroid cartilage. The anterior external surface gives attach- ment to the crico-thyroid muscles (seeJig. 26); more posteriorly we find an apophysis for the articulation of the thyroid (h,Jig. 20, B). Its posterior surface is divided into two equal por- tions by a vertical ridge along its middle line, a, d, Jig. 20, B. This ridge, which was first noticed by Galen, gives attachment to some longitudinal fibres of the oesophagus. On each side of it a concave surface is observed, which gives origin to the crico-arytenoidei postici, e, e,fig. 27. The internal surface is smooth, and lined by the mucous membrane of the larynx. The inferior margin is horizontal, and nearly circu- * Galen describes only three, j^ovJpo? 6wsosi$>)?, lar; but the superior, which is bevelled obliquely inwards and upwards, about c, e, (fig- 20,) ascends backwards in the direction ofe,f,g, b, (Jig. 20,) being slightly curved downwards between Jf and g. The anterior superior outline of this cartilage presents that of the section of a cylinder, whose obliquity to its axis is in the direction «, e, and therefore is elliptical. It recedes anteriorly from the lower margin of the thyroid cartilage in the direction of g,f, e, (fig. 20,) leaving an interval called the crico-thyroid space, a, (, B,) which is occupied by the crico-thyroid ligament; on each side, in the lines e, f, g, by the lateral liga- ments, and more posteriorly by the crico- arytenoidei laterales, in the space,/", g, to the external side of b (fi
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