Arm

The arm of man - referred to in medical terminology as a ( free ) Upper Limb - is the transformation / evolution of the forelimb of the animals for gripping tool, but serves with its oscillating movements and the balancing of the upright gait.

Anatomy

The arm is divided into:

Function

The upper extremity of man has the freedom of movement of all body parts, the wrist and finger joints cause by the mobility of the shoulder joint, the elbow joint, the forearm bones to each other, the wrist and subsequently their ability to function.

Movements of the shoulder joint

  • The movement is a sagittal axis allows the use of the arm from the side of the body and is known as adduction, that the side referred to as the abduction of the path body, the limit latter movement obtained at 90 ° and thereafter the further lifting of the arm to its elevation. The corresponding muscle groups are called adductors, abductors and Heber ( elevators ).
  • As anteversion, the lifting of the arm about a front axle forward, referred to as the retroversion of the opposite motion to the rear.
  • Internal and external rotation (turning inward or outward ) in the shoulder joint are used to support the supination and pronation in the forearm area.

Movements at the elbow and forearm

The diffraction (flexion ) and extension ( Extension) in the elbow joint are made possible by the flexors and extensors of the corresponding muscle groups. But the turning movement ( pronation and supination ) of the forearm are made ​​possible only by the rotation of the spokes condyle in the elbow joint.

Movements in the wrist

As movements in the wrist dorsiflexion and palmar flexion and ulnar - radial deviation and should be mentioned.

Movements of the finger joints

Flexion, extension, adduction and abduction of all fingers and opposition and apposition of the thumb only.

Sayings

As a " long arm " is a, sometimes referred to in the background acting, powerful influence of an institution, person or other factors exerted over long distances of time and space, such as

  • " The long arm of the law";
  • " The long arm of history";
  • " The long arm of coincidence ," a movie from the TV series Tatort;
  • " The long arm of the mullahs. Notes from my exile "(1995), a book by poet Said
Pendulum Walking Hand List of adductors of the human body List of abductors of the human body List of elevators of the human body List of flexors of the human body Extension (kinesiology)
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