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.
1 Once the medication has been loaded into the syringe, remove the 20 G needle, and replace it with a fine 25 G needle. 2  The primary site for a subcutaneous injection in your abdomen is 2 inches on either side of your navel, or belly button. 3  Wash your hands thoroughly and make sure that the surface you work on is clean. The injection is given here. 2  The other option is to give it in the outer aspect of your thigh, along the middle third. 3  Take a deep pinch between your thumb and forefinger and wipe with alcohol. 4  Then let dry. 5  Place the needle into this pinch of tissue and muscle completely, leaving none of the needle exposed.