Provide a detailed account of the structure of the human heart and also discuss the nerve supply in the heart

### Structure of the Human Heart

The human heart is a vital organ that functions as a muscular pump, ensuring the continuous circulation of blood throughout the body. Its structure is intricately designed to facilitate this function, comprising several key components:

#### 1. External Anatomy

The heart is a hollow, cone-shaped organ located in the thoracic cavity, slightly to the left of the midline. It is encased in a protective sac called the pericardium, which consists of two layers: 

- Fibrous Pericardium: The outer, tough layer that provides protection and anchors the heart to surrounding structures.
- Serous Pericardium: The inner layer, which has two sub-layers:
  - Parietal Layer: Adheres to the fibrous pericardium.
  - Visceral Layer (Epicardium): Directly covers the heart's surface.

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