**Core Concept**
The fallopian tube is a muscular, tube-like structure that connects the ovary to the uterus in the female reproductive system. It has several distinct regions, each with unique characteristics and functions. The correct order of these structures from lateral to medial (outer to inner) is crucial for understanding the anatomy and clinical applications of the fallopian tube.

**Why the Correct Answer is Right**
The correct order of the fallopian tube structures from lateral to medial is: Interstitial, Ampulla, Infundibulum, Isthmus. The Infundibulum is the lateral (outer) portion of the fallopian tube that contains the fimbriae, which are finger-like projections that help guide the oocyte from the ovary into the tube. The Ampulla is the widest portion of the tube, where fertilization typically occurs. The Isthmus is the narrow portion that connects the Ampulla to the Interstitial, which is the portion of the tube that passes through the uterine wall. This order is essential for understanding the anatomical relationships and clinical implications of the fallopian tube.

**Why Each Wrong Option is Incorrect**
**Option A:** Interstitial - This is the medial (inner) portion of the fallopian tube, not the lateral portion.
**Option B:** Isthmus - This is the narrow portion of the tube, but it is not the lateral portion.
**Option C:** Ampulla - This is the widest portion of the tube, but it is not the lateral portion.

**Clinical Pearl / High-Yield Fact**
The fimbriae of the infundibulum play a crucial role in capturing the oocyte released by the ovary, and any damage to this region can lead to infertility.

**Correct Answer:** D. Infundibulum.