# Heart and Blood Vessel Anatomy: Structural Overview
> Explore the structural anatomy of the heart and blood vessels, including chambers, heart valves, coronary circulation, and histological vessel layers.

Tags: heart-anatomy, cardiovascular-system, pre-med, coronary-circulation, heart-valves, vessel-histology
## Heart and Blood Vessel Anatomy: Structural Overview

## Gross Anatomy & Location
* **Location:** Mediastinum within the thoracic cavity, resting on the diaphragm.
* **Orientation:** Apex points anteriorly, inferiorly, and to the left; Base faces posteriorly.
* **Pericardium:** Consists of a tough external Fibrous Pericardium and a dual-layered Serous Pericardium (Parietal/Visceral).

## Layers of the Heart Wall
* **Epicardium:** Outer visceral layer of serous pericardium.
* **Myocardium:** Middle muscle layer; thickest part of the heart wall containing cardiac muscle and intercalated discs.
* **Endocardium:** Inner endothelial lining continuous with blood vessels.

## The Four Chambers
* **Atria:** Receiving chambers (Right and Left) separated by the interatrial septum.
* **Ventricles:** Pumping chambers. The **Left Ventricle** has a significantly thicker wall for systemic pumping.

## Heart Valves: Structural Gates
* **AV Valves:** Tricuspid (Right) and Mitral/Bicuspid (Left) anchored by Chordae Tendineae to Papillary Muscles.
* **Semilunar Valves:** Pulmonary and Aortic valves with three pocket-like cusps.

## Great Vessels
* **Inflow:** Superior/Inferior Vena Cavae (Right Atrium) and Pulmonary Veins (Left Atrium).
* **Outflow:** Pulmonary Trunk (Right Ventricle) and Aorta (Left Ventricle).

## Coronary Circulation
* **Arteries:** Left CA (LAD and Circumflex) and Right CA (Marginal and Posterior Interventricular).
* **Drainage:** Great, Middle, and Small cardiac veins emptying into the Coronary Sinus.

## Vessel Wall Structure
* **Arteries:** Round lumen with thick Tunica Media (muscle/elastic).
* **Veins:** Irregular lumen with thin Tunica Media and thick Tunica Externa; contains valves in limbs.
* **Microcirculation:** Arterioles regulate resistance; Capillaries (Continuous, Fenestrated, or Sinusoid) allow for exchange.
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