In mathematics and physicsthe right-hand rule is a common mnemonic for understanding orientation of axes in three-dimensional space. Most of the various left- and right-hand rules arise from the fact that the three axes of three-dimensional space have two possible orientations. One can see this by holding one's hands outward and together, palms up, with the fingers curled, and the thumb out-stretched.
View as PDF. It is obvious to all that the human hand represents a mechanism of the most intricate fashioning and one of great complexity and utility. But beyond this it is intimately correlated with the brain, both in the evolution of the species and in the development of the individual.
The concepts and the terminology are incredibly confusing and are sometimes backward from what you might expect. That means there are thousands of different movements the body is capable of performing one at a time or simultaneously and the following planes and axes of movement have been designed to categorize movement:. A plane is an imaginary flat surface along which a movement takes place. The three planes of movement include:.
The thumb is the first digit finger of the hand. When a person is standing in the medical anatomical position where the palm is facing to the frontthe thumb is the outermost digit. The Medical Latin English noun for thumb is pollex compare hallux for big toeand the corresponding adjective for thumb is pollical.
Table of content Results of measurement Hand profile Pragmatic hand evaluation. ZZM Pragmatic hand evaluation. Thanks to this, every reader is able to evaluate his hand or that of a student independently, whereby only approx.
The unique musculoskeletal structure of the human hand brings in wider dexterous capabilities to grasp and manipulate a repertoire of objects than the non-human primates. It has been widely accepted that the orientation and the position of the thumb plays an important role in this characteristic behavior. There have been numerous attempts to develop anthropomorphic robotic hands with varying levels of success.
The carpometacarpal CMC joints are five joints in the wrist that articulate the distal row of carpal bones and the proximal bases of the five metacarpal bones. It is the most important joint connecting the wrist to the metacarpus, and it plays an irreplaceable role in the normal functioning of the thumb. Pronation-supination of the first metacarpal is especially important for the pulp-to-pulp pinch ie, true opposition. The movements of the first CMC is limited by the shape of the joint, by the capsulo-ligamentous complex surrounding the joint, and by the balance among involved muscles.
The hand is distal to the forearm, and its skeletal framework includes the carpus, or wrist. In lay usage, however, the word "wrist" is used for the distal end of the forearm, a wrist-watch being worn over the lower ends of the radius and ulna. The position of the hand at rest is shown in figure The hand is of enormous importance, particularly the thumb.