**Core Concept**
The ischiorectal fossa is a fat-filled space located on either side of the anal canal, bounded by the pelvic diaphragm and the anal canal. It contains several important structures, including the **pudendal nerve** and **internal pudendal vessels**.

**Why the Correct Answer is Right**
A stab wound into the ischiorectal fossa 2 cm lateral to the anal canal would likely damage the **pudendal nerve**, which runs through this area, carrying sensory, motor, and autonomic fibers. This nerve is responsible for controlling the external anal sphincter and perineal muscles.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so it cannot be evaluated.
**Option B:** This option is not provided, so it cannot be evaluated.
**Option C:** This option is not provided, so it cannot be evaluated.
**Option D:** This option is not provided, so it cannot be evaluated.

**Clinical Pearl / High-Yield Fact**
The **pudendal nerve** is a key structure in the ischiorectal fossa, and damage to it can result in significant morbidity, including fecal incontinence and perineal numbness.

**Correct Answer:** D. Pudendal nerve.