Thorax

The thorax is an anatomical area of certain vertebrate animals or arthropods.

The word is borrowed from Latin thorax (of the Greek θώραξ meaning “Cuirasse”, then “Torse” starting from Hippocrates).

Mammals

This area, at the Man and the Mammalian S, is the upper part (or former) trunk ranging between the Cou and the Abdomen.

The thorax at the Man

  • Component skeletal:

Higher area of the trunk, the thorax is limited in top by the Ceinture scapular and the first pair of coasts, behind by the thoracic Rachis and the posterior arc of the coasts, laterally by the coasts, and ahead by the sterno-costal drill plate. Thus delimited a genuine osseous cage known as Rib cage is, with the coasts as bars, protecting from this fact the Viscères which it contains.

The upper limbs are suspended with the thorax via the belt scapular.

  • Component visceral:

The thorax contains the Poumons, resting each one on a side of the rachis in inside of the coasts which delimit the pulmonary gutter in which each lung is. Between the two, going down since the Larynx, the Trachée is divided into two principal bronchi opposite the 5th thoracic vertebra. This junction trachéale, called careens, sends to each lung its principal bronchus on the level of the Hile.

The Diaphragm, principal respiratory muscle, corresponds to the lower limit of the thorax. Being given the respiratory movements, this limit is mobile during breathing. The diaphragm has two cupolas, one on the right and one on the left, the higher line because being raised by the subjacent Foie. Between the two the tendineux center of the diaphragm is, area on which the Cœur rests.

This one is slightly excentré towards the left but remains mainly behind the sternum. It is projected on the thoracic vertebrae 6,7, and 8, being worth the name of " then to them; vertebrae cardiaques".

Behind the trachea and in front of the rachis, the esophagus goes down since the pharynx to the stomach which it will reach only after having crossed the diaphragm on the level of the 10th thoracic vertebra, by the hiatus œsophagien.

  • intrathoracic Areas:

The thorax can be separate in several areas. Laterally, one finds the gutters pulmonary containing the lungs and them Plèvre. Between the two, one distinguishes an anatomical area from great importance, called Médiastin, in which is the heart, the trachea, the esophagus, and the large vessels which are the Aorte, the pulmonary venas cava, and arteries right-hand side and left, as well as the trunk of the pulmonary Artère.

The thorax also contains many nervous and lymphatic elements.

Related article

Arthropod S

Thorax of the insect

Other arthropods

At the Crustacean S, Arachnida S, the thorax is amalgamated with the head to form the Céphalothorax.

See too

External bond

  • Thorax (external general Morphology) of the marine planktonique Copepoda

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