ulnar canal

(redirected from Guyon's Canal)

ulnar canal

[TA]
passageway through the transverse carpal ligament by which the ulnar nerve and artery enter the palm; it is closely related to the pisiform and the hook of the hamate.
Synonym(s): canalis ulnaris [TA], canal of Guyon
References in periodicals archive ?
Lipomas on the wrist may involve Guyon's canal and carpal tunnel (11).
If the median nerve is compressed, this may cause carpal tunnel syndrome, whereas a lipoma located in Guyon's canal will cause ulnar hypoesthesia (2).
Axial and sagittal T1-weighted, fat-saturated, contrast-enhanced MR images of the left wrist (Figure 3) reveal extension of the lesion proximally into Guyon's canal along the course of the ulnar nerve (arrow).
In the upper extremities, ganglia have been described to cause compression of the ulnar nerve in Guyon's canal, in the cubital tunnel or of the median nerve at the carpal tunnel.
Effort-related compression of median and ulnar nerves as a result of reversed three-headed and hypertrophied palmaris longus muscle with extension of Guyon's canal. Scand.
The anatomic region of Guyon's canal is approximately 4-4.5 cm in length and can be subdivided into three zones: 1) proximal to the pisiform bone (the area where the ulnar nerve bifurcates); 2) a deep ulnar (motor) compartment; 3) a superficial (sensory) compartment (see Figure 1).
To date there have been six case studies reporting compression in Guyon's canal secondary to lipoma [1-6].
David, Bath a: This sounds like Guyon's canal syndrome, or handlebar palsy, but you should see your GP to be sure.
Further, the medial approach keeps the needle well away from the median nerve (Figure 1) while also avoiding Guyon's canal, which contains the ulnar nerve and artery.
The ulnar nerve, after descending in the forearm between the flexor digitorum profundus and flexor carpi ulnaris muscles, pierces the deep fascia and enters the wrist through the Guyon's canal. In the distal canal, the ulnar nerve bifurcates into a superficial sensory branch and a deep motor branch, which supplies the hypothenar muscles and then passes across the palm, distributing to other intrinsic hand muscles.
Ulnar nerve compression at Guyon's canal by an anomalous abductor digiti minimi muscle: the role of ultrasound in clinical diagnosis.