Frederickson R G, Haines D E, Hall J E
J Med Primatol. 1985;14(4):209-23.
A Porocephalus nymph found in the meninges of a squirrel monkey was encapsulated by connective tissue cells and fibrils presumably derived from the pia mater. The capsule was composed of an inner layer (IL) adjacent to the nymphal integument and an outer layer (OL) adherent to the brain surface. Separating the two layers was a capsular space. The IL was lined by a granular material adjacent to the nymph surface and possessed impressions of annulae and the apical pits of chloride cells. The surface of IL facing the capsular space was characterized by a monolayer of cells possessing extensive anastomosing plasmalemmal processes. The OL was composed of several tiers of fibroblasts and associated collagen fibrils that adhered to the brain surface in the form of a thickened pia mater. It is suggested that the capsule was formed by a modification of the pia that isolated the nymph and created an "intracapsular space" with specialized lining cells to facilitate fluid exchange.
在一只松鼠猴的脑膜中发现的一个瑞氏裂头蚴若虫被结缔组织细胞和原纤维包裹，这些细胞和原纤维可能来源于软脑膜。该包囊由与若虫体表相邻的内层（IL）和附着于脑表面的外层（OL）组成。两层之间是一个包囊间隙。内层在若虫表面附近衬有颗粒物质，并具有环纹和氯化物细胞顶端小窝的印记。内层面向包囊间隙的表面的特征是有一层具有广泛吻合的质膜突起的细胞。外层由几层成纤维细胞和相关的胶原纤维组成，它们以增厚的软脑膜形式附着于脑表面。有人认为，该包囊是由软脑膜的一种改变形成的，它隔离了若虫，并形成了一个带有特殊衬里细胞的“囊内空间”，以促进液体交换。
