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. 2019 Jun;69(683):315–316. doi: 10.3399/bjgp19X704081

Figure 2.

Figure 2.

Picture demonstrating the anatomical location and structure of the flexor sheath. Flexor sheath is composed of annular (ring) pulleys and cruciate (cross) pulleys. The pulleys are identified as A1, A2, C1, A3, C2, A4, C3, and A5.