Henry Gray (18251861). Anatomy of the Human Body. 1918.
The medial borders of the two muscles are separated by a triangular interval, occupied by the middle cricothyroid ligament.
The Cricoarytænoideus posterior (posterior cricoarytenoid) (Fig. 958)arises from the broad depression on the corresponding half of the posterior surface of the lamina of the cricoid cartilage; its fibers run upward and lateralward, and converge to be inserted into the back of the muscular process of the arytenoid cartilage. The uppermost fibers are nearly horizontal, the middle oblique, and the lowest almost vertical.
The Cricoarytænoideus lateralis (lateral cricoarytenoid) (Fig. 959) is smaller than the preceding, and of an oblong form. It arises from the upper border of the arch of the cricoid cartilage, and, passing obliquely upward and backward, is inserted into the front of the muscular process of the arytenoid cartilage.
FIG. 959 Muscles of larynx. Side view. Right lamina of thyroid cartilage removed. (See enlarged image)
The Arytænoideus(Fig. 958) is a single muscle, filling up the posterior concave surfaces of the arytenoid cartilages. It arises from the posterior surface and lateral border of one arytenoid cartilage, and is inserted into the corresponding parts of the opposite cartilage. It consists of oblique and transverse parts. The Arytænoideus obliquus, the more superficial, forms two fasciculi, which pass