Because we expose our feet to potential injury in our daily lives by walking, we have all experienced pains in the feet at one time or another. There are many common causes of foot pains, such as blisters and corns. There are also less common causes of foot pain, such as sciatica and osteomyelitis.
The trachea, or windpipe (figs. 21-1 and 21-2), which has cervical and thoracic parts, extends from the inferior end of the larynx (C6 vertebra) to its point of bifurcation (between T5 and 7 vertebral level). It is about 9 to 15 cm in length. The trachea descends anterior to the esophagus, enters the superior mediastinum, and divides into right and left main bronchi. The trachea is a median structure but, near its lower end, deviates slightly to the right, resulting in the left main bronchus crossing anterior to the esophagus. Owing to the translucency of the air within it, the trachea is usually visible above the arch of the aorta in radiographs.
1 It is the link between your mouth and the stomach. 2  Muscular movements of the esophagus result in the passage of food from the mouth to the stomach cavity. 3  The esophagus and the trachea are located at roughly the same place. The esophagus and the trachea are located at roughly the same place. 2  They are separated by the epiglottis-a tiny flap that protects the trachea when you swallow something! 3  Length and location-The trachea is made of a number of cartilaginous semi circular rings. 4  These prevent the trachea from collapsing.