68 THE EUSTACHIAN TUBE, BY PROFESSOR RUDINGER. 



must be admitted that the two kinds of tissue at this point 

 are not very sharply differentiated from each other, since the 

 basilar nbro-cartilage is partially continued into the Eustachian 

 cartilage. 



The cartilage close to the bony portion of the tube presents 

 the form of a lamina, bent at right angles, with a horizontal 



Fig. 287. 



Fig. 287. Transverse section of the Eustachian tube and the ad- 

 joining parts. 1, Median plate of the cartilage ; 2, lateral hook of 

 the cartilage ; 3, dilatator muscle of the tube ; 4, levator palati ; 

 5, basilar nbro-cartilage ; 6 and 7, acinous glands ; 8, layer of fat 

 on the lateral wall ; 9, safety tube (Sicherheitsrohre) ; 10, accessory 

 fissure (Hilfsspalte) ; 11, fold of the mucous membrane ; 12, tissue 

 bounding the tube laterally. 



and a gradually attenuating vertical and lateral limb. No carti- 

 lage is as yet present on the median side, because the median and 

 posterior wall of the osseous tuba is longer than the lateral, and 

 therefore here forms its boundary, whilst the opposite part of 

 the wall is already composed of the lateral cartilaginous lamina. 



