<prompt> Posterior gliding of tibia on femur is prevented by ?Anterior cruciate ligamentPosterior cruciate ligamentMedial collateral ligamentLateral collateral ligament  <response>: Ans. is b i.e., Posterior cruciate ligament Posterior cruciate ligament PCL begins from posterior pa of intercondylar area of tibia and runs upwards, forwards and medially to attach the anterior pa of the lateral surface of medial condyle of femur. PCL is extrasynol but intracapsular, i.e., lies between synovium and capsule of the knee joint. It provides antero-posterior stability and prevents posterior gliding of tibia on femur. It is taut in flexion. Blood supply of cruciate anterior posterior ligaments is from : - Middle genicular aery major supply Inferior genicular medial lateral aery less impoant. Nerve supply of cruciate ligaments ACL PCL is from posterior aicular branch of tibial nerve. 