Bursa of the knee joint

Knee bursae
Sagittal section of right knee-joint, thus showing only frontal bursae.
Anatomical terminology []

The bursae of the knee are the fluid sacs and synovial pockets that surround and sometimes communicate with the joint cavity. Thin-walled and filled with synovial fluid, they represent the weak point of the joint, but also produce enlargements to the joint space. They can be grouped into either communicating and non-communicating bursae or, as below, after location.

In front there are five bursae:

Laterally there are four bursæ:

Medially, there are five bursae: