Wreden’s test is to demonstrate: MP 09; NEET 15
**Core Concept**
Wreden's test, also known as the "Wreden's test" or "Wreden's maneuver", is a clinical examination technique used to assess the integrity of the anal sphincter muscles. It involves applying gentle pressure to the perineum to assess the resting tone of the anal sphincter.
**Why the Correct Answer is Right**
Wreden's test is a useful clinical tool for evaluating anal sphincter function, particularly in patients with fecal incontinence or suspected anal sphincter injury. The test helps to assess the resting tone of the anal sphincter by applying gentle pressure to the perineum, which, if the sphincter is intact, will cause the anal canal to bulge. This is due to the normal resting tone of the anal sphincter, which helps to maintain continence.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Wreden's test is not used to assess the rectal tone or the rectal reflex arc.
**Option B:** This option is incorrect because Wreden's test is not used to evaluate the perianal sensation or the anal wink reflex.
**Option C:** This option is incorrect because Wreden's test is not used to assess the rectal compliance or the rectal capacity.
**Clinical Pearl / High-Yield Fact**
Wreden's test is an essential clinical tool for evaluating anal sphincter function, and its results can help guide further management and treatment of patients with fecal incontinence or suspected anal sphincter injury.
**Correct Answer: D. Evaluation of anal sphincter tone.**