THE EVOLUTION OF A BURSA 181 



Pharynx. A small central pit constituting a single bursa the bursa 



pharyngea. 

 Behind the angle of the lower jaw. One. 

 On the symphysis of the chin. One. 

 On the Acromion process. One. 

 Beneath the deltoid and the acromion process, one large bursa often 



opening into the shoulder -joint. 

 Elbow. 



(a) One over the olecranon. 



(b) One occasionally over the inner epicondyle. 



(c) One over the internal condyle of the humerus. 



(d) One over the external condyle of the humerus. 



(e) Small one between the biceps tendon and the head of the 



radius. 



(f) Often a second bursa which separates the tendon from 



the oblique ligament crossing it. 

 Wrist. 



(a) One over the styloid process of the radius. 



(b) One over the styloid process of the ulna. 



Hand. 



(a) One over each of the metacarpophalangeal joints. 



(b) One over each of the phalangeal joints. 



Begion of hip. 



(a) One over the anterior superior spine of the ilium. 



(b) Large one between the great trochanter and the gluteus 



maximus muscle. 



(c) One between the gluteus medius and the bone. 



(d) One between the gluteus minimus and the bone. 



(e) One between the psoas and iliacus muscles often opening 

 into the hip-joint. 



Thigh. 



(a) One over external condyle of the femur. 



(b) One over internal condyle of the femur. 



Knee-joint. The prepatellar bursa?. 



(a) Between the skin and superficial fascia at the lower edge 



of the patella there is often a small subcutaneous bursa. 



(b) Beneath the superficial fascia over the fascia lata there 



is always a large interfascial bursa, intersected by smooth 

 fibrous bands extending downwards over the upper part 

 of the patellar ligament. 



(c) One still deeper between the deep fascia and front of the 



bone there is a layer of lax connective tissue. 



