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The cross-section of the corpus radii has an almost three-sided shape. The Margo interosseus is medially directed, at this edge the Membrana interossea antebrachii is attached. It is located between the anterior and posterior facies. The lateral facies has a roughness of varying degrees in the middle third of the shaft, the pronator tuberosity, which is where the pronator teres muscle comes in. The lateral facies is separated from the posterior facies by the posterior margo. | The cross-section of the corpus radii has an almost three-sided shape. The Margo interosseus is medially directed, at this edge the Membrana interossea antebrachii is attached. It is located between the anterior and posterior facies. The lateral facies has a roughness of varying degrees in the middle third of the shaft, the pronator tuberosity, which is where the pronator teres muscle comes in. The lateral facies is separated from the posterior facies by the posterior margo. | ||
| − | + | ===Distal end== | |
| − | + | At the distal end (distal extremity) there is a bony protrusion, the stylus process (Processus styloideus radii). This is where the brachioradialis muscle begins. The distal end is thicker in its entirety than the shaft of the radius. | |
| − | + | On the medial side of the distal end is a notch, the incisura ulnaris. It is there for the head of the ulna. | |
| + | The widening distal end of the radius has the articulation surface Facies articularis carpalis. The carpal bones border on it. | ||
==Funktion== | ==Funktion== | ||
Version vom 26. Mai 2020, 13:29 Uhr
The radial bone (lat. radius) is one of the two bones of the forearm. It belongs to the tubular bones and runs approximately parallel to the ulna. The spoke is located on the thumb side of the forearm.
Anatomie
<lightbox-Einbettung src="file:RadiusVentral.png" group="image-group-1" caption="Ansicht des Radius (Ventral)"/><lightbox-Einbettung src="file:RadiusDistal. png" group="image-group-1" caption="Anatomy of the radius (ventral)"/> 
The radius is the somewhat more strongly developed bone of the forearm and lies approximately parallel to the ulna. With its long, narrow shape it belongs to the tubular bones. The radius is divided into the shaft (Corpus radii), one extremity proximal and one extremity distal.
Proximal end
At the proximal extremity there is the caput radii with the fovea articularis. The fovea articularis is a plate-shaped socket, which is framed by the Circumferentia articularis. This is where the connection to the humerus is located. Distally of the head of the ulna is the place with the smallest diameter, the collum radii. At the transition between collum radii and corpus radii, the tuberosity radii is located medially.
Radius shaft
The cross-section of the corpus radii has an almost three-sided shape. The Margo interosseus is medially directed, at this edge the Membrana interossea antebrachii is attached. It is located between the anterior and posterior facies. The lateral facies has a roughness of varying degrees in the middle third of the shaft, the pronator tuberosity, which is where the pronator teres muscle comes in. The lateral facies is separated from the posterior facies by the posterior margo.
=Distal end
At the distal end (distal extremity) there is a bony protrusion, the stylus process (Processus styloideus radii). This is where the brachioradialis muscle begins. The distal end is thicker in its entirety than the shaft of the radius. On the medial side of the distal end is a notch, the incisura ulnaris. It is there for the head of the ulna. The widening distal end of the radius has the articulation surface Facies articularis carpalis. The carpal bones border on it.
Funktion
Der Radius bildet zusammen mit der Ulna eine funktionelle Einheit. Die beiden Knochen bilden die knöcherne Grundstruktur des Unterarmes und geben ihm Stabilität. Der Radius ist zusammen mit der Elle an den Bewegungen des Unterarmes und der Hand beteiligt.
Entwicklung
Der Radius-Schaft beginnt bereits in der siebten Embryonalwoche mit der perichonralen Verknöcherung. Die distale Epiphyse dagegen wird bis zum zweiten Lebensjahr und die proximale sogar bis zum siebten Lebensjahr gebildet. Zwischen dem 14. und 17. Lebensjahres findet der vollständige Verschluss der Epiphysenfugen statt.
