Neuromuscular Junction Structure
The Location, Size, and Shape of the Heart
The sternum and mediastinum.
- It is approximately the size of a man’s fist (230-350 grams) and is shaped like an inverted cone.
- About two thirds of the heart’s mass is located to the left of the body’s midline.
- The narrow end of the heart, which is called the apex, is directed downward and to the left.
The apex of the heart.
- It is located at the approximate level of the fifth or sixth rib, just above the arch of the diaphragm.
The location of the heart in relation to the diaphragm.
- The broad end of the heart is called the base and gives rise to the major blood vessels.
The base of the heart.
- It is directed upward and to the right and lies at the approximate level of the second rib.
Location and Orientation of Heart Quiz