Question

Column I contains names of the sphinter muscles of the alimentary canal and Column II contains their locations. Match them properly and choose the correct answer.

Column I	Column II
A. Sphincter of ani internus	1. Opening of hepatopancreatic duct into duodenum.
B. Cardiac sphincter	2. Between duodenum and posterior stomach.
C. Sphincter of Oddi	3. Guarding the terminal part of alimentary canal.
D. Ileocaecal	4. Between oesophagus and anterior stomach.
E. Pyloric sphincter	5. Between small intestine and bowel.

• A. A-3, B-2, C-4, D-1, E-5
• B. A-2, B-5, C-1, D-4, E-3
• C. A-3, B-4, C-1, D-5, E-2
• D. A-4, B-3, C-2,D-1, E-2

Answer 1

Answer: (C)

A-3, B-4, C-1, D-5, E-2

Sphincter circular muscle that constricts a passage or closes a natural orifice. When relaxed, a sphincter allows materials to pass through the opening. Sphincter of ani internus is a circular ring of muscles which surrounds the anal region.

Cardiac sphincter is present between oesophagus and stomach and opens as the food approaches and is moved to the stomach by the rhythmic wave of peristalsis.

The sphincter of Oddi is a muscular valve that controls the flow of pancreatic juice and bile juice into the duodenum. Ileocaecal is a valve present between large and small intestine.

Pyloric sphincter is the opening between stomach and duodenum, it is usually closed but opens as the peristaltic waves pass over. Thus the correct answer is C.