Unterarmknochen/en: Unterschied zwischen den Versionen
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| − | + | The forearm bones are formed from the parallel tubular bones: Ulna and radius. The ulna is located in the medial side of the forearm. The radius is parallel to the ulna and has a thicker diameter. The two bones are connected by the membrana interossea antebrachii. | |
| − | + | If the forearm is in supination position (palm of the hand points forward in hanging arm position), the forearm bones are parallel. In the pronation position (palm of the hand points backwards in the hanging arm position), however, the parallelism of the bones is no longer present. The ulna and the radius cross each other. | |
==Funktion== | ==Funktion== | ||
Version vom 26. Mai 2020, 12:45 Uhr
Radius and ulna are the human forearm bones (lat. Ossa antebrachii) and are therefore located in the free upper extremity. They belong to the tubular bones. They are limited by the humerus and the carpal bones. The elbow joint and wrist are formed at these points.
Anatomie
The forearm bones are formed from the parallel tubular bones: Ulna and radius. The ulna is located in the medial side of the forearm. The radius is parallel to the ulna and has a thicker diameter. The two bones are connected by the membrana interossea antebrachii. If the forearm is in supination position (palm of the hand points forward in hanging arm position), the forearm bones are parallel. In the pronation position (palm of the hand points backwards in the hanging arm position), however, the parallelism of the bones is no longer present. The ulna and the radius cross each other.
Funktion
Durch die Unterarmknochen wird eine Verbindung des Oberarmes mit der Hand geschaffen. Die zwei Unterarmknochen bilden Gelenke mit dem Oberarmknochen und den Handwurzelknochen. Die Ulna und der Radius ermöglichen die Drehung des Armes durch die Überkreuzung der Knochen beim Wechsel von Supinations- in Pronationsstellung.
