Size Shape and Position of the Heart

The heart is located in the thoracic cavity in the mediastinum, the area between the lungs. About two-thirds of it lies to the left of the median plane (fig. 19.2). The broad superior portion of the heart, called the base, is the point of attachment for the great vessels described previously. Its inferior end, the apex, tilts to the left and tapers to a blunt point (figs. 19.3 and 19.4). The adult heart is about 9 cm (3.5 in.) wide at the base, 13 cm (5 in.) from base to apex, and 6 cm (2.5 in.) from anterior to posterior at its thickest point—roughly the size of a fist. It weighs about 300 g (10 oz).

Frontal Section The Thoracic Cavity

Figure 19.2 Position of the Heart in the Thoracic Cavity. (a) Relationship to the thoracic cage; (b) cross section of the thorax at the level of the heart; (c) frontal section of the thoracic cavity with the lungs slightly retracted and the pericardial sac opened. Does most of the heart lie to the right or left of the median plane?

Figure 19.2 Position of the Heart in the Thoracic Cavity. (a) Relationship to the thoracic cage; (b) cross section of the thorax at the level of the heart; (c) frontal section of the thoracic cavity with the lungs slightly retracted and the pericardial sac opened. Does most of the heart lie to the right or left of the median plane?

Saladin: Anatomy & Physiology: The Unity of Form and Function, Third Edition

19. The Circulatory System: The Heart

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718 Part Four Regulation and Maintenance

Saladin Anatomy And Physiology Heart

- Fat in interventricular sulcus

- Left ventricle

- Right ventricle

- Anterior interventricular artery

Cross Section Orbit Valve

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Responses

  • phyllis
    Where is the position of the heart?
    4 years ago
  • Eoghan
    What is the length of the apex of the heart from the median plane?
    3 years ago
  • noora
    What is the shape and size of the heart?
    3 years ago
  • JAXON
    What is the position size and shape of the heart?
    2 years ago
  • katie allan
    Where the thoracic cavity is positioned in human?
    2 years ago

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