100 EQUINE ANATOMY. 



elsewhere. Blood vessels : laryngeal arteries. ]N^erves : 

 the superior and inferior laryngeal, furnished by the 

 pnenmo-gastric. 



The external surface of the larynx offers four planes : 

 a superior, inferior and two laterals. 



The internal surface offers three regions: a middle, 

 the glottis; a superior, the supra-glottis, and an infe- 

 rior, the sub-glottis. Tlie first is comprised between 

 the vocal cords; the second shows the two ventricles 

 of tlie larynx, the sub-epiglottic sinus and the entrance 

 of the larynx ; the third exhibits the posterior border 

 of the vocal cords and the sub-arytenoid sinus. 



Salivary glands.— 1. Parotid. Division: Two faces, 

 two borders and two extremities. External face shows 

 a longitudinal groove for the jugular vein, and is cov- 

 ered by the parotido auricularis muscle. Internal face 

 covers the guttural pouch, the insertion of the small 

 oblique muscle of the head and mastoido humeralis, 

 occipito-hyoideus, styloid bone, digastricus, sterno-max- 

 illaris, maxillary gland, external carotid artery and 

 facial nerve. Anterior border rests on the teraporo- 

 maxlllary joint, subzygomatic vessels and nerves and 

 maxillo-muscular vessels. Posterior border is separated 

 from the wing of the atlas by the levator humeri. 

 Superior extremity embraces concha. Inferior extrem- 

 ity is comprised in the angle formed by the jugular 



