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The posterior aspect of the capsule lies deep to the biceps femoris muscle (laterally), semimembranous muscle (medially), and medial and lateral heads of the gastrocnemius muscle.
With the above muscles reflected, the external ligaments and capsule of the knee are visible.The following extrinsic ligaments contribute to the support of the knee [the images are of a right knee]:
Links and References:
Grant's: 5.57-5.72
Netter (1ed.): 477-480 (2ed.): 473-476
Rohen/Yokochi: 420-423