Question

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : In case of tympany in cattle the site of trocarisation is left flank.
Reason R : The rumen is situated in the left half of the abdominal cavity and extends from the pelvic brim caudally to the $7^{\text{th}/8^{\text{th}}$ rib cranially behind the diaphragm.
In light of the above statements, choose the correct answer from the options given below:

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is NOT the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Hint:

Remember that in ruminants, the left side of the abdomen is dominated by the rumen, while the right side contains the omasum, abomasum, and most of the intestinal loops.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Tympany (bloat) in cattle is a condition characterized by the overdistension of the rumen and reticulum with gas, which can be life-threatening if not relieved.

Step 2: Detailed Explanation:
Let us evaluate both statements:
- Assertion A: "In case of tympany in cattle the site of trocarisation is left flank."
Trocarisation is an emergency surgical procedure where a trocar and cannula are inserted through the abdominal wall into the rumen to release trapped gas. This is performed at the center of the left paralumbar fossa (left flank). Thus, Assertion A is true.
- Reason R: "The rumen is situated in the left half of the abdominal cavity and extends from the pelvic brim caudally to the $7^{\text{th}}/8^{\text{th}}$ rib cranially behind the diaphragm."
Anatomically, the massive rumen occupies almost the entire left half of the abdominal cavity in ruminants. It extends cranially to the diaphragm (opposite the $7^{\text{th}}$ or $8^{\text{th}}$ rib) and caudally to the pelvic inlet/brim. Thus, Reason R is true.
Since the rumen is located on the left side of the abdomen, any surgical access to it (including trocarisation to relieve bloat) must be performed on the left flank.
Therefore, both A and R are true, and R is the correct anatomical explanation of A.

Step 3: Final Answer
The correct option is (A).