Human upper limb

See also: Arm

At the man and the Biped S, the upper limbs (or arm in the language running) are both members connected to the trunk by the means of the shoulder S.

The upper limbs each one consist of three segments: the arm, the Front armlever and the Hand. The Articulation of the elbow connects the arm to the front armlever, and the Poignet connects the front armlever to the hand.

Note: in the article, the word arm refers to the segment of member.

Anatomical structure of the human upper limb

Shoulder

The shoulder consists of 3 Os: the Humérus, the Scapula or the Scapula and the Clavicle. The roof of the shoulder is formed by part of the scapula called the Acromion.

Five articulation S compose the shoulder divided into 2 functional complexes:

  • between the humérus and the scapula (Scapula): articulation scapulo-humérale, or gléno-humérale (the cavity glénoïde being the articular surface of the scapula answering the head humérale), and the articulation under-acromiale which allows the mobility of the arm (vault under-acromio-coracoïdienne).
  • between the scapula and the Thorax: omo-thoracic and acromio- and sterno-claviculaire which allows the mobility of the scapula on the thorax.

Arm

Its solidity is ensured by the Os humérus. One counts 3 Muscle S important on this floor: the Muscle brachial, the Triceps muscle brachial and the Muscle biceps brachial. Vascularization depends on the Artère humérale.

Elbow

The elbow is an articular complex which allows the movements of Flection - Extension of the front armlever on the arm. This area also takes part in the movements of prono - Supination of the front armlever.

Three bones take part in the articular complex:

  • the humérus ;
  • the radius located outwards (according to the anatomical reference frame of position);
  • the ulna or ulna located in inside.
These two last are articulated on the distal épiphyse of the humérus.

Front armlever

External bonds

  • anatomy

Simple: ARM

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