- Loge de Guyon (French)
- Guyon's tunnel
The ulnar tunnel at the wrist.
Also known as loge de Guyon (French). Synonym: canalis nervi ulnaris. A small superficial tunnel-like structure at the base of the hypothenar bounded by the retinaculum flexorum manus and the musculus flexor carpi ulnaris. The canal transmits blood vessels and the ulnar nerve from the forearm to the hand. When there is compression within Guyon's canal, the nerve can be affected, and Guyon's canal syndrome results.
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