Transactions . eirrelations to the muscles and great vessels. development, is within the tonsillar sinus, indeed a part ofthe tonsil. Killian (1898) has shown that this fossa is thesame as TourtuaFs cavity, and that it is surrounded withlymphoid tissue. Fraser (1910) emphasized the fact that thecapsule of the tonsil is above the fossa and Hett (1910) hasproven through his splendid comparative study that the fossais a definite part of the tonsil. A study of Fig. 2 will show 313 the lymphoid mass and secondary crypt within the fossa, andFig. 6, which is a section from an adult taken above thepha
Transactions . eirrelations to the muscles and great vessels. development, is within the tonsillar sinus, indeed a part ofthe tonsil. Killian (1898) has shown that this fossa is thesame as TourtuaFs cavity, and that it is surrounded withlymphoid tissue. Fraser (1910) emphasized the fact that thecapsule of the tonsil is above the fossa and Hett (1910) hasproven through his splendid comparative study that the fossais a definite part of the tonsil. A study of Fig. 2 will show 313 the lymphoid mass and secondary crypt within the fossa, andFig. 6, which is a section from an adult taken above thepharynx, shows the extension of the fossa upward, and that itis covered on its medial side by lymphoid tissue and space in this latter section is in fact the crypt of the supra-tonsillar mass, or. as Fetterolf has suggested, this should becalled tlie superior tonsillar fossa. I have not found that the retroton>ill;ir plica requires spe-cial nuiition in tliis study, but the plica triangularis has not. Fig. 6. Photomicrograph of section taken through the superior tonsillarfossa of an adult. It will be noted that there is lymphoid tissuebounding the medial as well as the lateral wall of the fossa whichwould not be the case if the fossa were extratonsillar. This fossais the developed secondary crypt appearing in the postero-superiorlymphoid mass in the embryo. M, medial wall of superior ton-sillar fossa. been properly emphasized in text descriptions. Hammar hasshown that the plica triangularis is an early development ofthe tonsil and marks the division between the anterior andposterior outgrowths. Fig. 7. Somewhat later the plica is seento contain a greater or less amount of lyinphoid tissue. Fig. as in the case of the superior tonsillar fossa, the plica tri-angularis must be regarded as a part of the tonsil and thespace behind, a secondary ciypt, may be correctly designated 314 the anterior tonsillar fossa. Fettcrolf (1912) has made thisclear in his Fig. 4, to w
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