Thumb and finger guide attachable to a computer mouse and a computer mouse incorporating same

A thumb and finger guide structure for use with a computer mouse having a palm portion and two lateral opposite sides, said structure comprising:

• a) a palm member dimensioned and shaped to fit over the palm portion of the computer mouse;
• b) a thumb guide extending from said palm member;
• c) a finger guide extending from said palm member and spaced from said thumb guide, said finger guide being spaced from said thumb guide by an amount approximately equal to the distance between the thumb and little finger of the hand of the intended user when the hand is in an open relaxed position so that the structure supports the user's hand in an open relaxed position and said guides being positioned such that the mouse may be moved and lifted without said user's thumb and finger gripping the two lateral opposite sides thereof;
• and
• d) means for attaching said structure to an existing computer mouse.