The space in the thoracic cavity between the concave inner surfaces of the lungs, in which (in a special pericardial cavity) the heart is located, is called the mediastinum. The thoracic cavity is lined with a serous membrane called the pleura. The lungs are enclosed in the so-called pleural cavities, which are separate in man but communicate with one another in the majority of mammals. The shape of the thoracic cavity depends upon the shape of the thorax and the position of the diaphragm.
We sell 5 hammock sizes on the Traditional Hammocks (no spreader wood bars). Therefore, the length of the hammock is the same for each size but the difference is the width. Width gives the size. The larger the size, the wider and bigger the hammock.
To hang a hammock between two trees, find hardwood trees with trunks at least 12â in diameter. The distance between the two trees should be the same length or up to 1â or 2â greater than the length of your hammock (measuring from one hanging loop to the other hanging loop). For example, select trees which are 13â apart for a hammock that measures 11â to 12â from tip to tip.