Palpable; slightly convex; rough part is due to attachment of QUADRICEPS FEMORIS); Distal to Patella, tendon of QUADRICIPS is known as Patellar Ligament

 is rough due to insertion of fibers of patellar ligament 

Upper Parts Of Medial And Lateral Borders of patella 

receive insertions of VASTUS MEDIALIS and VASTUS LATERALIS muscles (parts of quadriceps femoris) 

of medial and lateral borders and apex give Attachment To Patellar Ligament

 Superior Border (Base)

receives insertions of rectus femoris and vastus intermedius muscles (parts of quadriceps femoris)