The Tendons of the Hand
The prominent tendons on the dorsal side of the hand are those of extensor digitorum and extensor digiti minimi.
The tendons leading to the thumb are those of extensor pollicis brevis and abductor pollicis longus, described above, and extensor pollicis longus, a deep forearm muscle whose tendon appears here on the hand from the dorsal side of the arm. The depression formed by these tendons is called the snuffbox. When snuff was a habit, one would sprinkle it into a pile here before sniffing it.
The palm of the hand is covered by an aponeurotic sheath that houses the tendons of the flexors of the fingers. When the fingers are strongly tensed, one can sometimes see the individual branches of this sheath.