True about inguinal canal -a) It is an intermuscular canalb) Superficial inguinal ring is situated superior and lateral to pubic tuberclesc) Deep inguinal ring is superio-medial to attachment of rectus abdominisd) In male vas deference passes through it

**Core Concept**
The inguinal canal is a significant anatomical structure in the anterior abdominal wall, allowing for the passage of the spermatic cord in males and the round ligament of the uterus in females. It is a complex structure that involves the intersection of multiple layers of the abdominal wall.

**Why the Correct Answer is Right**
The inguinal canal is indeed an intermuscular canal, as it traverses between the external oblique and internal oblique muscles. The superficial inguinal ring is located superior and lateral to the pubic tubercle, marking the external opening of the canal. The deep inguinal ring, on the other hand, is situated superomedial to the attachment of the rectus abdominis muscle, marking the internal opening of the canal. In males, the vas deferens, along with the testicular arteries and veins, passes through the inguinal canal.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because the inguinal canal is not entirely intermuscular; it is a complex structure that involves the intersection of multiple layers of the abdominal wall, including the external and internal oblique muscles, the transversus abdominis muscle, and the aponeuroses of these muscles.

**Option B:** This is incorrect because the superficial inguinal ring is indeed superior and lateral to the pubic tubercle, but this is not the defining characteristic of the inguinal canal.

**Option C:** This is incorrect because the deep inguinal ring is superomedial to the attachment of the rectus abdominis muscle, not the inguinal ligament (femoral sheath).

**Option D:** This is incorrect because the vas deferens does indeed pass through the inguinal canal, but this is not the only structure that passes through the canal.

**Clinical Pearl / High-Yield Fact**
The inguinal canal is a common site for hernias, particularly indirect inguinal hernias, which occur when there is a weakness in the posterior wall of the canal. It is essential to understand the anatomy of the inguinal canal to diagnose and treat these conditions effectively.

**Correct Answer: D. Vas deference passes through it.**