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.
BTW: TB is intradermal not subq. IM injections need to go into the muscle for optimal absorption and include many meds such as antibiotics, vaccinations. Muscles can absorb more fluid in the shot as well (so can be a Bigger volume). Subcutaneous (subq) goes into the deeper layers of the skin but not into muscle. Examples are insulin, epinephrine, lovenox; the volume is a lot less as well. Subcutaneous is just under the skin and IM means intramuscular, or into the muscle. subcutaneous is a smaller and thinner needle that is just injected under the skin, it is usually around 1/3 of an inch and the gage of the needle is small almost always. IM is a longer needle and the gage is thicker, this is due to the fact that it has to be injected into the muscle.