Capitulum of The Humerus - Archosauromorpha

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.

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