Transactions . ela-tive development of these cause the type variations encoun-tered, and that these variations are within the capsule. I havefound capsular relations to the pillars relatively constant. Circulation.—From the careful reconstruction of the ar-terial circulation from several serially sectioned tonsils, itseems quite definitely settled that there is a wide variation 315 in the points of entrance and the regions supplied by the dif-ferent tonsillar rami. These variations can be explained bythe fact that different embryonal masses are supplied by dif-ferent arteries, and the variatio
Transactions . ela-tive development of these cause the type variations encoun-tered, and that these variations are within the capsule. I havefound capsular relations to the pillars relatively constant. Circulation.—From the careful reconstruction of the ar-terial circulation from several serially sectioned tonsils, itseems quite definitely settled that there is a wide variation 315 in the points of entrance and the regions supplied by the dif-ferent tonsillar rami. These variations can be explained bythe fact that different embryonal masses are supplied by dif-ferent arteries, and the variations in the development of themasses will result in some displacement of the arteries in dif-ferent directions, depending on the type of adult tonsil. Indiscussing, then, the arteries of the tonsil, it is not possible togive a definite position for any one of the rami, but a moreor less general statement must satisfy. Figure 10 representsthe average position of the arteries determined by the exam-inations Fig. 8. Section of same region shown in Fig. 7, but taken from a 200mm., embryo showing the invasion of the plica triangularis bylymphoid tissue. The superior tonsillar mass is early supplied by a ramusfrom the descending palatine branch of the internal frequently divides at some distance from the tonsil intotwo branches, one of which passes medial to the superior ton-sillar fossa, wdiile the other supplies the lateral portion of theupper pole region. This vessel enters the capsule from aboveand somewhat dorsal to the middle. It has been constantbut not large. .•)lo Till ]iosteriiji- t()n>illar mass receives a suppl\- from twosources, the ascendinj;- pharyngeal and the ascending- ramus from the ascending pharyngeal enters the tonsilon the (lorso-lateral aspect; it may he near the lower pole oras high as the middle. (Jne emliryo was enet)untered in whichthere were two rami from the ascending pharyngeal, one en-tering the mass near the low
Size: 1589px × 1572px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectophthalmology, bookye
