1282 



A MANUAL OF ANATOMY 



Root of Tongue 





yellow elastic tissue, and, with its fellow, is attached in front to 

 the receding angle of the thyroid cartilage at its centre, and 

 behind to the vocal process of the arytenoid cartilage. Its inner 

 border, which is covered by mucous membrane, is free and clearly 

 defined. In its front part there is a small nodule of elastic cartilage 

 called the cartilage of Luschka (Klein). 



Crico-thyroid Joint. — This belongs to the class diarthrosis. The 

 articular surfaces are the facet on the inner surface of the inferior 

 cornu of the thyroid cartilage, and that on the outer surface of the 

 cricoid cartilage posteriorly. The joint is surrounded by a capsular 

 ligament, and this is lined with a synovial membrane. The move- 

 ments allowed are as follows: (i) rotation of the thyroid cartilage 

 round an axis passing transversely through both joints; and 

 (2) ghding, in which the cricoid moves upwards and backwards, or 

 downwards and forwards, this movement par- 

 taking somewhat of a swinging character. 



The recurrent laryngeal nerve ascends close 

 behind the crico-thyroid joint preparatory to 

 entering the larynx. 



Crico-arytenoid Joint. — This belongs 

 Epiglottis to the class diarthrosis. The articular 

 surfaces are the convex facet on the 

 superior border of the cricoid 

 cartilage posteriorly, and the 

 concave under surface of the 

 base of the arytenoid cartilage. 

 The joint is surrounded by a 

 ^^caniiag^V'wHsberg capsular ligament, and this 

 is lined with a s5niovial mem- 

 brane. The movements allowed 

 are as follows: (i) rotation, in 

 which the arytenoid cartilage 

 rotates on a nearly vertical axis, 

 the effect being to invert, or 

 evert, the vocal process; and 

 (2) gliding in a lateral direction, 

 in which one cartilage moves in- 

 wards towards its fellow, or outwards away from its fellow. 



The cornicula laryngis are usually connected to the arytenoid 

 cartilages by fibrous tissue, but in some cases there is a synovial 

 articulation. 



Prelaryngeal Lymphatic Glands. — These glands are inconstant. 

 When present, there may be one, or there may be two. They lie upon 

 the median portion of the crico-thyroid membrane, in the interval 

 between the crico-thjn-oid muscles. Their afferent vessels are derived 

 from (i) the infraglottic portion of the larynx, the lymphatics from 

 which pierce the crico-thyroid membrane; (2) the commencement of 

 the trachea; and (3) the upper part of the isthmus of the thyroid 

 body. Their efferent vessels pass either to the inferior deep cervical 

 glands, or to the pretracheal glands as an intermediate gland-station. 



Aryteno- 

 epiglottidean Fold 

 ..False Vocal Cord 

 Ventricle 

 True Vocal Cord 



Vocal Process of 

 Arytenoid Cartilage 



Rima Glottidis Cartilage of Santorini 



Fig. 530. — The Superior Aperture 



OF THE Larynx and Adjacent 



Parts. 



