BIOL 204 Week 3 Lab

Dissection and

Anatomy of the Heart

Objective 1 Human Heart Anatomy

The heart has an apex and a base:

Base

Apex

The heart is surrounded by a pericardium:

Human Heart In the Thorax Pericardial Sac Cut Open

Surrounded by the pericardium

The wall of the heart consists of three tissue layers:

1. Epicardium (visceral pericardium)

2. Myocardium

3. Endocardium

Structures Visible On the Anterior Surface/Associated Vessels:

Superior Vena Cava

Right Pulmonary Veins

Right Auricle

Pulmonary Trunk

Inferior Vena Cava

Aortic Arch

Left Pulmonary Veins

Left Auricle

Anterior Interventricular Sulcus

Brachiocephalic Left Common Left Subclavian Artery Carotid Artery Artery

Structures Visible on The Posterior Surface:

Aorta

Pulmonary Veins

Coronary Sinus

Superior Vena Cava

Pulmonary Arteries

Inferior Vena Cava

Posterior Interventricular Sulcus

The Heart Has Four Chambers:

Interatrial Septum: lies between the atria

Interventricular Septum: lies between the ventricles

Internal Structures of the Heart

Pectinate Muscle

Fossa Ovalis

Tricuspid Valve

Chordae Tendineae

Papillary Muscles

Bicuspid Valve

Semilunar Valves

Trabeculae Carneae

Interventricular Septum

These two Structures of the Adult Heart Are Remnants of Fetal Circulation:

Ligamentum Arteriosum

Fossa Ovalis

The heart receives its own branch of systemic circulation – there vessels collectively are called coronary circulation

Arteries Veins

A Sectioned Preserved Human Heart:

1. Interatrial septum

2. Right atrium

3. Left atrium

4. Interventricular septum’

5. Right ventricle

6. Left ventricle

9. Pulmonary trunk

Sheep’s Heart Dissection:

note the thickness of the right ventricular and left ventricular walls

Cardiac Muscle in found in the myocardium: