Question: the large pad at the base of the thumb is called

title: Finger
text: The extensors are located on the back of the forearm and are connected in a more complex way than the flexors to the dorsum of the fingers . The tendons unite with the interosseous and lumbrical muscles to form the extensorhood mechanism . The primary function of the extensors is to straighten out the digits . The thumb has two extensors in the forearm ; the tendons of these form the anatomical snuff box . Also , the index finger and the little finger have an extra extensor , used for instance for pointing . The extensors are situated within 6 separate compartments . The 1st compartment contains abductor pollicis longus and extensor pollicis brevis . The 2nd compartment contains extensors carpi radialis longus and brevis . The 3rd compartment contains extensor pollicis longus . The extensor digitorum indicis and extensor digititorum communis are within the 4th compartment . Extensor digiti minimi is in the fifth , and extensor carpi ulnaris is in the 6th .