THE HAND 89 



arise, the common palmar sheath may require to be excised, 



Digital synovial sheath 



Synovial sheath of 

 flex. poll. long. 



Ridge on os multangulum majus 



Transverse carpal ligament , 



Tuberosity of naviculai 



Common 

 " palmar sheath 



Pisiform 



FIG. 32. The Synovial Sheaths of the Wrist and Hand. The positions of 

 various incisions for the evacuation of pus are also shown. 



i and 2. Incisions into the common palmar sheath, placed between the median and 

 ulnar nerves. 



3. Incision uniting i and 2. 



4. Incision into the proximal part of the sheath of flexor pollicis longus. It is placed 

 between the radial artery and the median nerve. 



5. Incision into the distal part of the sheath of flexor pollicis longus. 



6. Incision into the thenar space. 



7. Incision over terminal phalanx. 



8. 9 and 10. Incisions into the digital sheaths. They lie opposite the shafts of the 

 phalanges. 



though the operation usually results in some damage to the 

 median and ulnar nerves. 



Deep Muscles of the Palm. The adductor pollicis possesses a transverse 



