Non progressive contraction of esophagus are: (A) Primary, (B) Secondary, (C) Teiary, (D) Quaternary
Answer is C. Three types of contractions in the oesophagus, they are *primary -progressive, triggered by swallowing *secondary-progressive,generated by distension,or irritation *teiary -non-progressive Ref: SRB&;s manual of surgery,5th ed, pg no 788