THE ORGANS OF RESPIRATION 237 



The intrinsic ligaments, meaning those within or 

 on the inside of the larynx, connecting the thyroid 

 and cricoid cartilages, are the cricothyroid membrane, 

 two capsular ligaments. 



The cricoid and arytenoid cartilages are connected 

 by loose capsular ligaments lined by synovial mem- 

 branes, and by a posterior cricoarytenoid ligament 

 running from the cricoid to the inner and back part 

 of the base of the arytenoid. 



The Interior of the Larynx (Cavum Laryngis). This 

 is divided into an upper and a lower part by the rima 

 glottidis. The upper opens into the pharynx by the 

 upper aperture of the larynx, between which and the 

 rima glottidis are the ventricles and their saccules, and 

 the false vocal cords. The lower aperture is continuous 

 with the trachea. 



The rima glottidis is the space between the true 

 vocal cords and the bases of the arytenoid cartilages. 

 It is somewhat less than 1 inch long, and according to 

 its degree of dilatation, from f to J inch wide. In 

 easy respiration its form is triangular with the base 

 posterior, and when fully dilated it is lozenge-shaped. 



The superior or false vocal cords are two mucous 

 folds, each enclosing the corresponding superior 

 thyro-arytenoid ligament. This latter is a thin band 

 running between the angle of the thyroid and the 

 antero-external surface of the arytenoid cartilage. 



The inferior or true vocal cords are two strong bands, 

 the inferior thyro-arytenoid ligaments, covered by 

 mucous membrane and attached to the depression 

 between the alse of the thyroid cartilage in front and 

 the anterior angle of the base (vocal process) of the 

 arytenoid cartilages behind. 



The ventricles of the larynx lie one on each side, 

 between the upper and lower vocal cords, bounded 

 externally by the thyro-arytenoidei. 



The saccule of the larynx is a space on each side, 

 between the false vocal cord and the inner surface 



