ABSTRACT
The terms ulnar and radial are more straightforward than medial and lateral. The same applies to the names thumb, index finger, middle finger, ring finger and little finger instead of digitus I to V. The flexors run in sheaths that are reinforced by thicker areas, also known as pulleys, of which the A2 and A4-pulleys mechanically are the most important for an optimal bending function of the finger. The extensors of the thumb form the borders of the anatomical snuff box. The m. extensor pollicis longus lies on the dorsal side of the thumb, inserts onto the distal phalanx and extends the IP joint. The little finger too consists of a second extensor; the m. extensor digiti minimi/quinti. At the dorsal level of the MCP joints, the extensor tendons are centralized by the sagittal bands. Just distal to this, the extensor aponeurosis divides in a central slip and two lateral slips.
