The mucosa of the small intestine is lined by a simple columnar epithelium which consists primarily of absorptive cells (enterocytes), with scattered goblet cells and occasional enteroendocrine cells.In crypts, the epithelium also includes Paneth cells and stem cells.he mucosa of the small intestine is characterized by evagination into plicae and villi, which increase the surface area for nutrient absorption, and by short tubular invaginations, the crypts, which provide a protected site for stem cells.
The following are sites where you can give a subcutaneous injection: 1  Abdomen: Uncover your abdomen. 2  Thigh: Uncover the entire leg. 3  Lower back: Uncover the back from the waist to the top of the buttocks.  Upper Arm: Uncover the arm to the shoulder.
The system is intended to be injected in the submucosal layer of the proximal anal canal (i.e. above the level of the dentate line).  1 Establishment Registration & Device Listing. 2  Parulkar BG, Sobti MK, Pardanani DS (1985). Dextranomer dressing in the treatment of infected wounds and cutaneous ulcers.