Acute appendicitis

Term 1: Anatomical Location of the Appendix
Definition 1: Located at the terminal end of the caecum where three taeniae coli join, approximately $2\,\text{cm}$ below the ileocaecal orifice.
Term 2: Dimensions of the Appendix
Definition 2: Typically $9\text{-}10\,\text{cm}$ in length, with an external diameter of $5\text{-}6\,\text{mm}$ and a lumen diameter of $1\text{-}3\,\text{mm}$.
Term 3: Blood Supply of the Appendix
Definition 3: Supplied by the appendicular artery (a branch of the ileocolic artery) located in the mesoappendix, and occasionally an accessory appendicular artery of Seshachalam.
Term 4: Wallbridge Classification - Type A
Definition 4: Partial duplication of the appendix in a single caecum.
Term 5: Wallbridge Classification - Type B
Definition 5: Two separate appendices in a single caecum.
Term 6: Wallbridge Classification - Type C
Definition 6: Double caecum, with each caecum possessing one appendix.
Term 7: Most Common Positions of the Appendix
Definition 7: Retrocaecal ($75\%$) is most common, followed by pelvic ($21\%$). Other positions include subcaecal, paracaecal, preileal, and postileal.