Which of the following muscle is attained to perineal body:
**Core Concept**
The perineal body is a critical anatomical structure in the pelvic floor that provides attachment points for various muscles, fasciae, and ligaments. It plays a vital role in maintaining pelvic organ support and continence.
**Why the Correct Answer is Right**
The correct answer is the external anal sphincter muscle (EAS). The EAS is a striated muscle that surrounds the anal canal and is primarily responsible for voluntary control of defecation. The muscle is attached to the perineal body, which provides a broad base of attachment for the EAS and other perineal muscles. This attachment is essential for maintaining continence and preventing anal incontinence.
**Why Each Wrong Option is Incorrect**
**Option A:** The superficial transverse perineal muscle is actually attached to the ischial tuberosity and the perineal body, but it's not the primary muscle attached to the perineal body.
**Option B:** The deep transverse perineal muscle is attached to the perineal body, but it's not the primary muscle attached to it.
**Option D:** The bulbospongiosus muscle is attached to the ischial tuberosity and the perineal body, but it's not the primary muscle attached to the perineal body.
**Clinical Pearl / High-Yield Fact**
The perineal body is a key landmark in pelvic floor anatomy and is often involved in obstetric and surgical procedures. It's essential to identify and preserve the perineal body during surgical interventions to prevent long-term pelvic floor dysfunction.
**Correct Answer: C. External anal sphincter muscle.**