1. Endoscopy
Is a diagnostic medical procedure used to visualize the interior surface of an organ by inserting a small (tiny) tube into the body usually through natural body opening or by small an acquired incision.
Endoscopy used also for taking biopsy , removal of foreign body , grasping , aspiration , suction , insufflations , and operative endoscope used for doing minimally invasive surgery .

3. The endoscope consists from
1- Rigid or flexible fiberscope. 2- Light source. 3- Lens system transmitting the image to the viewer from the fiberscope. 4- Additional channel.

4. Insertion tube consist from –image guide (IG) and light guide (LG) bundles channels for suction , irrigation , and insufflations and several layers of protective materials. Last tip called twisting section.

5. Hand piece contain , eyepiece , air /water and suction valves, deflection control knobs and locks and the opening to the accessory channel. The umbilical cord contain the portion of the fiberscope that connect to the light source, including connectors for insufflations and irrigation.

6. Types of endoscopy
A- For (GIT ) 1- oesophagogastroduodenoscopy –for esophagus , stomach and duodenum.

7. 2- Enteroscopy –for proximal small bowel , capsule endoscopy also can be used.