| Plate II. | |||
| THE LUNGS | |||
| R. | Right Lung. | L. | Left Lung. |
| W. | Windpipe (Trachea). | ||
| V. | Voicebox (Larnyx). | ||
The top part of the left Lung is represented as partly cut away in order to show the ramifications of the Bronchial Tubes.
Plate III.
THE CHEST.
- B B. Breast Bone.
- C C. Collar Bones.
- 1 to 11. Ribs. (The twelfth not visible.)
- M (curved dotted line). Midriff (Diaphragm).
- L L. Lungs. H. Heart.
- W. Windpipe (Trachea).
The Lungs are enclosed in the chest, which they fit exactly, and of which they occupy by far the largest portion, leaving but a small space for the heart. They consist of two halves ([pl. II], R, L), each roughly resembling the upper part of a sugar-loaf somewhat flattened and hollowed out at the bottom. The left shows two and the right three distinct flaps or lobes. They are only connected by means of the windpipe ([pl. II], W) and its branches.
The Chest ([pl. III]) is an air-tight chamber, which is narrower above than below. It is formed by the spine at the back, twelve ribs ([pl. III], 1 to 11, the twelfth not visible on the drawing), with their inner and outer muscles on either side, the breast-bone ([pl. III], B B) in front, the root of the neck at the top, and the midriff or diaphragm ([pl. I], M) at the bottom.