BURSA • E-FREE TRANSLATION.COM • Definition of Bursa

... the shoulder, on the other hand, is exceedingly common. In most cases it is merely the deltoid muscle and the subcutaneous tissue over it that are bruised, but sometimes a haematoma forms either in the muscle or in the sub-deltoid bursa. There is pain on moving the limb, and the patient may be unable to abduct the arm at the shoulder-joint. Under treatment by massage and movement, the symptoms usually pass off completely in two or three weeks. The affections of ...

— Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. • Alexander Miles