The term "Guyon&;s canal" is in relation to which of the following?

Guyon's canal or ulnar tunnel is an osseofibrous tunnel formed by the pisohamate ligament bridging the concavity formed by the pisiform bone and hook of the hamate. The ulnar a nerve passes through this tunnel in the wrist and its compression here lead to ulnar tunnel syndrome characterised by hypoesthesia of medial 1 and 1/2 fingers and weakness of intrinsic muscles of the hand. Ref: Textbook of anatomy upper limb and thorax, Vishram Singh, 2nd edition, page no.150, 180