Carpal Tunnel Cross Section
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According to one study a 2 mm 2 difference in nerve cross section between the level of the pronator quadratus and the carpal tunnel has a 99 sensitivity and 100 specificity for carpal tunnel syndrome 9.
Carpal tunnel cross section. The carpal tunnel s cross section is elliptical in shape with a major axis that is twice as large as its minor axis. I ve colored the two nerves yellow. A flattening ratio of over x 3 bowing of the flexor retinaculum of 4 mm.
Some of the other proposed findings include. On the left is the ulnar nerve. I ve colored the tunnel itself white this is where the problem is.
The interior and exterior carpus boundaries also had elliptical cross sections. You will also find radial artery trapezoid scaphoid median nerve ulnar artery flexor retinaculum carpal tunnel hypothenar muscle ulnar bursa hamate capitate extensor tendons as well. Nerves in the carpal tunnel cross section image.
Wrist cross section carpal tunnel. Fig 1 transverse section of the carpal tunnel. The hand is in a palm up position.
The one on the right is the median nerve the main nerve compressed or pinched in carpal tunnel syndrome. The carpal tunnel accommodates free movement of its contents and the tunnel s cross sectional area is a useful morphological parameter for the evaluation of the space available for the carpal tunnel contents and of potential nerve compression in the tunnel. Contents the carpal tunnel contains a total of 9 tendons surrounded by synovial sheaths and the median nerve.
The osseous boundary of the carpal bones at the dorsal border of the carpal tunnel is commonly used to determine the tunnel area but this boundary contains soft tissues such as numerous intercarpal ligaments and the flexor carpi.
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