THE KAIL 



relatively to the palate somewhat lower in the child than in the adult. Through 

 this aperture the mucous membrane of the pharynx is continuous with that which 

 lines the tympanum, and under certain conditions air passes into and out of that 

 cavity. Mucous glands open on the inner surface of the cartilaginous part of 

 the tube : they are most numerous near the pharyngeal orifice. There is also a 







Fig. 96. VIEW OF THE RIGHT NASAL FOSSA AS SEEN IN A SECTION THROUGH THE SKULL TAKEX 



TO THE RIGHT OF THE SEPTUM. (E. A. S.) 



1, incisor canal ; 2, bone of hard palate ; 3, 4, 5, parts of the cartilage of the aperture : 6, 

 cartilage of the septum ; 7, atrium leading to middle meatus ; 8, agger nasi ; 9, frontal sinus ; 10, 

 inferior ethmoidal concha ; 11, superior ethmoidal concha ; 12, spheno-ethmoidal recess ; 13, entrance 

 to sphenoidal sinus ; 14, pituitary fossa ; 15, sphenoidal sinus ; 16, inferior turbinal ; 17, rod passed 

 into Eustachian txibe ; J8, salpingo-pharyngeal fold, immediately behind this is the lateral recess of 

 the pharynx, not specially indicated in the drawing ; 19 ; soft palate ; 20, uvula ; 21, tongue. 



considerable amount of lymphoid tissue especially in young subjects, and near the 

 pharyngeal end of the tube. 



Vessels and Nerves. The arteries of the tube are derived on the one hand from 

 the pharyngeal branch of the external carotid, and on the other from the middle 

 meningeal and vidian branches of the internal maxillary. The nerves arise from 

 the tympanic plexus and pharyngeal twigs of the vidian nerve. 



Muscles. Besides the middle part of the tensor palati muscle, which takes 

 origin along the whole length of the lateral plate of the hooked cartilage of the tube 

 (fig. 95), the levator palati also has an attachment to the commencement of the 



