Observation of Papillary Tubercles on the Capsule of Swine Spleen : II. Histological Stuctures of Papillary Tubercles

돼지 비장표면(脾臟表面)의 유두양(乳頭樣) 결절(結節)에 관한 관찰(觀察) : II. 유두양(乳頭樣) 결정(結節)의 조직학적(組織學的) 구조(構造)

The papillary tubercles (PTs) developed on the splenic capsule of normal Landrace pigs were collected and their histological structures were observed with light microscope. The results were summarized as follows : 1. The external features of the PTs were smooth spherical or oval form protruded on the splenic capsules. On cross section of PTs, the shapes were predominantly round or elliptical single follicular form, and were often multifollicular and irregular form in some PTs. 2. The PTs were interposed into the splenic capsule. Therefore the peripheral boundary of PT was consisted of splenic capsular tissue and this tissue was covered with mesothelium, The basal tissues of PT were consisted of thick connective tissue and smooth muscle of splenic capsule, and capsular foramen for transport tract between splenic parenchyma and the PT was found at the center of the basal boundary of PT. 3. The basal region of PT was composed of parenchyma and this tissue was the splenic red pulp but the central and peripheral regions of PT contained much more erythrocytes than in the splenic parenchymae. 4. The splenic parenchymae adjoining to PT contained more erythrocytes than in other splenic parenchymal regions and parallel fixed cells directed to the capsular foramen.