bone: sternum

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Image: Sternum from ventral (Linkmap)

Sternum Sternocleidomastoideus Subclavius Pectoralis minor Pectoralis major Rectus_abdominis

Sternum (breastbone)

three-part bone (manubrium, corpus, processus xiphoideus) in the ventral thorax, which attaches to the ribs, origin for many muscles. The sternum rises cranially with a noticeable ventral movement during chest (in)breathing and lowers during exhalation. Some muscles attached to the sternum are therefore also expiratory respiratory muscles or inspiratory respiratory muscles. The sternum provides bony protection for the mediastinum behind it.

Manubrium

the small cranial part of the sternum, the origin of some muscles such as the sternothyroid and sternohyoid muscles.

Corpus

the large middle part of the sternum, origin for muscles such as pectoralis major

Processus xiphoideus

the small, spine-like caudal part of the sternum, origin for muscles such as transversus thoracis, diaphragm

Joints

Tapes

For the ligaments, see the corresponding joints sternocostal joint and sternoclavicular joint.

Pictures

Sternum from the side

Ligaments (Bild links to Linkmap)

Manubrium with sternocostal joint and sternoclavicular joint (image links to linkmap)