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Anomalous muscle causing ulnar nerve compression at Guyon's canal. 2012

Georgios K Paraskevas, and Orestis Ioannidis, and Dimitrios S Economou
Department of Anatomy, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece. g_paraskevas@yahoo.gr

We report a rare anatomical variation of an anomalous supernumerary muscle in a male cadaver. It was crossing Guyon's canal, superficial to the ulnar nerve and ulnar artery, and inserted into the aponeurosis of the little finger. This muscle could potentially cause entrapment of the ulnar nerve in Guyon's canal.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D002102 Cadaver A dead body, usually a human body. Corpse,Cadavers,Corpses
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D017769 Ulnar Nerve Compression Syndromes Ulnar neuropathies caused by mechanical compression of the nerve at any location from its origin at the BRACHIAL PLEXUS to its terminations in the hand. Common sites of compression include the retroepicondylar groove, cubital tunnel at the elbow (CUBITAL TUNNEL SYNDROME), and Guyon's canal at the wrist. Clinical features depend on the site of injury, but may include weakness or paralysis of wrist flexion, finger flexion, and ulnar innervated intrinsic hand muscles, and impaired sensation over the ulnar aspect of the hand, fifth finger, and ulnar half of the ring finger. (Joynt, Clinical Neurology, 1995, Ch51, p43) Guyon Syndrome,Entrapment Syndrome, Ulnar Nerve,External Compression Syndrome, Ulnar Nerve,Ulnar Nerve Compression,Ulnar Nerve Entrapment,Ulnar Nerve Entrapment Syndrome,Ulnar Nerve Entrapment at the Wrist,Ulnar Nerve External Compression Syndrome,Compression, Ulnar Nerve,Entrapment, Ulnar Nerve,Entrapments, Ulnar Nerve,Guyon Syndromes,Nerve Compression, Ulnar,Nerve Entrapment, Ulnar,Syndrome, Guyon,Syndromes, Guyon,Ulnar Nerve Compressions,Ulnar Nerve Entrapments
D018482 Muscle, Skeletal A subtype of striated muscle, attached by TENDONS to the SKELETON. Skeletal muscles are innervated and their movement can be consciously controlled. They are also called voluntary muscles. Anterior Tibial Muscle,Gastrocnemius Muscle,Muscle, Voluntary,Plantaris Muscle,Skeletal Muscle,Soleus Muscle,Muscle, Anterior Tibial,Muscle, Gastrocnemius,Muscle, Plantaris,Muscle, Soleus,Muscles, Skeletal,Muscles, Voluntary,Skeletal Muscles,Tibial Muscle, Anterior,Voluntary Muscle,Voluntary Muscles

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