What is the Blind sac hanging from initial part of colon?

The blind sac hanging from initial part of colon is Vermiform appendix.

Vermiform appendix arises from the caecum about 2.5 cm below the ileocecal junction and is a narrow blind-ended tube ,10 cm long and 8mm or less in diameter .It has no obvious function and is considered a rudimentary organ . It contains abundant aggregation of lymphoid nodules known as mucosa associated lymphatic tissues(MALT).