You need know muscle attachments only to predict the muscle's action. Radial deviators have LOA on the radial side of the wrist's AP axis. Ulnar deviators have LOA on the ulnar side of the wrist's AP axis. This ligament connects the scaphoid and trapezium on the hand's radial side with the hamate on the ulnar side.
Repetitive motion can produce a tenosynovitis in the tendon sheaths of the long flexor muscles.
This, in turn, can increase hydrostatic pressure in the tunnel, causing compression damage to median nerve. They also include weakness of muscles innervated by the median nerve, the thenar muscles, and the first and second lumbricales. The tunnel's contents are also prone to compression injury due to trauma, congenital stenosis, acromegaly, or hormonal changes. Further discussion of carpal tunnel syndrome from a Charles Eaton MD's hand surgery pages.