**Core Concept:** Myxoma is a benign tumor that can occur in the heart or in the skeletal muscle. It is a rare tumor with a strong predilection for the atrium of the heart. The term "myxoma" comes from its gelatinous, mucoid, or myxoid appearance on histopathology.

**Why the Correct Answer is Right:**
Heart myxomas are usually seen in the left atrium, which is called "cardiac myxoma". They originate from the mesenchymal cells within the atrial wall, specifically from the muscularis layer. These cells are of smooth muscle lineage and can differentiate into myxoid tissue.

Hea refers to Heinrich Adolf Bülow-Schleyer, a German cardiac surgeon who first described cardiac myxomas in 1904.

**Why Each Wrong Option is Incorrect:**
Option A is incorrect because myxomas are not seen in skeletal muscle, which is the primary site for option B. Option C is incorrect because myxomas are not seen in ventricular chambers, which is the location of option D.

**Clinical Pearl / High-Yield Fact:**
The combination of "Hea" in the question is a reminder of the historical figure who first described these tumors. This is an important clinical pearl as cardiac myxomas are a significant differential diagnosis in patients presenting with embolic events, stroke, or systemic embolization. Understanding the origin of these tumors and their typical location can aid in making an accurate diagnosis.

**Correct Answer:**
Correct Answer: .