Chap. II] 



CAVITIES OF THE BODY 



19 



a. Orbital cavity. — The orbital cavity contains the eye, the optic 

 nerve, the muscles of the eyeball, and the lacrimal apparatus. 



b. Nasal cavity. — The nasal cavity is filled in with the struc- 

 tures forming the nose. 



c. Buccal cavity. — The buccal cavity or mouth contains the 

 tongue, teeth, and salivary glands. 



d. Thoracic cavity. — The thoracic cavity, or chest, contains 

 the trachea or windpipe, the lungs, oesophagus or gullet, heart, and 

 the great vessels springing from, and entering into, the heart. 



Fig. 5. — Position of the Thoracic and" Abdominal Organs (Rear View). 



(Morrow.) 



Diaphragm. — The diaphragm is a dome-shaped muscle, and 

 forms a transverse partition between the thoracic and adbominal 

 cavities. 



