The ductus seminalis attaches at the side, from the hind end of the long, broad ductus bursae, whose surface is mostly roughened.
Two non-communicative bursae are located in front of the patella and below the patellar tendon, and others are sometimes present.
Inflammation of the bursae might also be caused by other inflammatory conditions such as rheumatoid arthritis, scleroderma, systemic lupus erythematosus and gout.
Healthy bursae create a smooth, almost frictionless functional gliding surface making normal movement painless.
Bursae are readily inflamed when irritated, as their walls are very thin.
Many species brood developing larvae in the bursae, effectively giving birth to live young.
These include the subacromial, prepatellar, retrocalcaneal, and pes anserinus bursae.
Four considerably smaller bursae are located on the back of the knee.
