HEAD AND NECK OF THE HORSE 



101 



it is related to the ventricular muscle, while iu the opposite direction 

 it is in contact with the vocal and lateral crico-arytenoid muscles. 

 The cavity of the appendix should be explored, and its communication 

 with the cavity of the larynx through the ventricle determined. 



Dissection. — If the glosso-epiglottic fold of mucous memljraue be 

 removed, the under-lying hyo-epiglottic muscle will be revealed. At 

 the same time the hyoid attachment of the geuio-glossal muscle will 

 be made more clear than was previously possible. 



M. HYO-EPIGLOTTICUS. — The right and left hyo-epiglottic muscles 

 lie so close together, and are so ill defined medially, that they are 



Arytenoid cartilage. 



Corniculate cartilage. 

 I Aryepiglottic fold. 



glottic fold, 

 palate. 



Cricoid cartilage. 



Lateral ventricle. 



Vocal fold. ' 



Ventricular fold. 



Lig. cr 



Fig. 39. — The larynx in median section, to show 



Hyoid bone. 

 \ M. hyo-epiglotticus. 

 > Thyroid cartilage. 



M. thyreohyoideus. 



.ledian ventricle, 

 cothyreoideum. 



ts lateral wall from within. 



often described as one muscle. ' They are covered by the elastic 

 hyo-epiglottic ligament. Pale in colour and plentifully intermixed 

 with fat, the muscular fibres arise mainly from the body of the hyoid 

 bone, though a few of them may be traced into the root of the tongue. 

 Their insertion is into the lingual surface of the base of the epiglottis. 



Dissextion. 

 larynx. 



-Clean the nerves and vessels on the intact side of the 



The Nerves and Vessels of the Larynx. — The nerves that supply 

 the larynx are the cranial laryngeal and the recurrent, both branches 

 of the vagus. The former enters the larynx by the thyroid notch 

 and is distributed mainly to the mucous membrane of the larynx, 



