**Core Concept**
The Medullary Cartridge or Medullary Channel (MCH) is a specialized structure within the adrenal medulla responsible for the regulation of catecholamine release. It functions as a calcium channel that controls the influx of calcium ions into chromaffin cells, thereby modulating the secretion of adrenaline and noradrenaline.

**Why the Correct Answer is Right**
The correct answer is related to the location of the MCH within the adrenal gland. The MCH is situated near the chromaffin cells in the adrenal medulla, where it plays a crucial role in the regulation of catecholamine release. The MCH acts by controlling the influx of calcium ions into chromaffin cells, which is essential for the exocytosis of catecholamines. This process is mediated by the voltage-gated calcium channels, specifically the L-type calcium channels, which are present in the MCH.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the MCH is not located on the adrenal cortex, which is responsible for the production of steroid hormones, not catecholamines.

**Option B:** This option is incorrect because the MCH is not located on the chromaffin cells themselves, but rather near them, in the adrenal medulla.

**Option C:** This option is incorrect because the MCH is not a type of receptor, but rather a specialized structure within the adrenal medulla.

**Clinical Pearl / High-Yield Fact**
The MCH is an essential structure for the regulation of catecholamine release, and its dysfunction can lead to various endocrine disorders, including pheochromocytoma. Understanding the location and function of the MCH is crucial for medical professionals to diagnose and manage these conditions effectively.

**Correct Answer: C. MCH located on the chromaffin cells' nearby location, not exactly on the cells themselves.