Human Anatomy Vol 1

THORAX

Left ventricle

JI

Aortic valve

I

noh"

JI

Oxygenated blood to all tissues except lungs

I

Venous blodd collected

JI

Superior vena cava and inferior vena cava

I

J

Right atrium

Bight ventricle

I

J

Pulmonary valve

I

Pulmonary trunk and pulmonary arteries

JI

Only to lungs

JI

Deoxygenated blood gets oxygenated

JI

4 pulmonary veins

I

J

left atrium

notched and the interior is sponge-like, which

prevents free flow of blood.

Along the right border of the atrium there is a

shallow vertical groove which passes from the

superior vena cava above to the inferior vena cava

below. This groove is called the sulcus terminalis.It

is produced by an internal muscular ridge called the

crista terminalis (Fi9.18.11). The upper part of the

sulcus contains the sinuatrial or SA node which acts

as the pacemaker of the heart.

The right atrioventricular groove separates the right

atrium from the right ventricle. It is more or less

vertical and lodges the right coronary artery and the

small cardiac vein.

Right border

Right akium

Line of incision

Coronary sulcus

lnferior vena cava

it to the right ventricle through the right
atrioventricular or tricuspid opening. It forms the right
border, part of the upper border, the sternocostal
surface and the base of the heart (Fig. 18.7).

ExlemolFeotures

1 The chamber is elongated vertically, receiving the
superior vena cava at the upper end and the inferior
vena cava at the lower end (Fig. 18.11).

2 The upper end is prolonged to the left to form the
right auricle (Latin little ear). The auricle covers the
root of the ascending aorta and partly overlaps the
infundibulum of the right ventricle. Its margins are

Left common carotid artery

Right brachiocephalic vein

Brachiocephalic artery

Superior vena cava

Right pulmonary artery

Left subclavian artery

Left brachiocephalic vein

Left pulmonary artery

Pulmonary trunk

Left auricle

Left border

Left ventricle

Right ventricle

Anterior interventricular g roove

Posterior interventricular groove

Apex

lnferior border

Fig.18.10: Externalfeatures of heart; (1) Line of incision for right atrium, (2) for right ventricle, and (3) for left ventricle

Systemic circulation Pulmonary circulation