456 



MUSCULAR MOTION. 



tilages, likewise, enter into the constitution of the larynx. These are, 

 the epiglottis ; and two small bodies, that tip the arytenoid cartilages, 

 and are met with only in man capitula Santorini, supra-arytenoid 

 cartilages or capitula cartilaginum arytenoldarum. 



Fig. 195. 



Fig. 196. 



View of the interior of the left half of the 

 Larynx, to show the Ventricle and Laryngeal 

 Pouch. (After Hilton.) 



a. Left arytenoid cartilage, e, e. Sections of the 

 cricoid cartilage, t. Thyroid cartilage, e. Epiglot- 

 tis, v. Left ventricle of the larynx, r. Left inferior 

 or true vocal cord. s. Laryngeal pouch, b. Ary- 

 teno-epiglottidean muscle, or compressor sacculi 

 laryngis. /. Inside of trachea, which has been 

 added to this figure. 



Larynx from above. (Willis.) 



G E H. Thyroid cartilage, embracing the 

 ring of the cricoid r u x w, and turning upon 

 the axis x z. N F, N F. The arytenoid carti- 

 lages, connected by the arytenoideus transver- 

 sus. TV, TV. The vocal ligaments. NX. The 

 right crico-arytenoideus lateralis (the left 

 being removed), vkf. The right thyro-aryte- 

 noideus (the left being removed). N 1. N I. The 

 crico-arytenoidei postici. B^B. The crico-ary- 

 tenoid ligaments. 



On examining the interior of the larynx, two clefts are seen one 

 above the other ; the uppermost being usually oblong-shaped ; ten or 

 eleven lines long, and two or three broad ; having the shape of a tri- 

 angle, the apex forwards. It is circumscribed, anteriorly, by the thy- 

 roid cartilage and epiglottis ; posteriorly, by the arytenoid cartilages ; 

 and, laterally, by two folds of mucous membrane, which pass from the 

 epiglottis to each arytenoid cartilage, and are called superior ligaments 

 of the glottis and superior vocal cords. A few lines below this is a 

 second cleft, also oblong from before to behind and of a triangular 

 shape, the base of which is behind. It is bounded anteriorly by the 

 thyroid cartilage ; posteriorly, by a muscle extending from one aryte- 

 noid cartilage to the other the arytenoideus; and, laterally, by two 

 folds, formed of the thyro-arytenoid ligament, passing from the ante- 

 rior part of the arytenoid cartilage to the posterior part of the thy- 



