Trisha Shetty

Capitulum of the humerus

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Latin  Capitulum humeri
FMA  23373
TA  A02.4.04.022
Capitulum of the humerus

In human anatomy of the arm, the lateral portion of the distal articular surface of the humerus consists of a smooth, rounded eminence, named the capitulum of the humerus. In non-human tetrapods, the name capitellum is generally used, with "capitulum" limited to the anteroventral articular facet of the rib (in archosauromorphs).

Contents

It articulates with the cupshaped depression on the head of the radius, and is limited to the front and lower part of the bone.

Lepidosauromorpha

Lepidosaurs show a distinct capitellum and trochlea on the centre of the ventral (anterior in upright taxa) surface of the humerus at the distal end.

Archosauromorpha

In non-avian archosaurs, including crocodiles, the capitellum and the trochlea are no longer bordered by distinct ect- and entepicondyles respectively, and the distal humerus consists two gently expanded condyles, one lateral and one medial, separated by a shallow groove and a supinator process. Romer (1976) homologizes the capitellum in archosauromorphs with the groove separating the medial and lateral condyles.

In birds, where forelimb anatomy has adaptation for flight, its functional if not ontogenetic equivalent is the dorsal condyle of the humerus.

References

Capitulum of the humerus Wikipedia


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