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The supracondylar foramen with a (seemingly) osseous peripheral arch noticed on the medio-distal feline humeri had remained disputed among anatomists. Some scholars have argued in favor of homology between this foramen and the supracondyloid foramen formed in presence of the ligament of Struthers in humans. Other theories include its presence as a retinaculum holding the median nerve and brachial artery to their anatomical position in a flexed elbow. Unfortunately, these theories lack investigative rigor. The emergence of non-invasive imaging modalities, such as micro-computed tomography, has enabled researchers to inspect the internal anatomy of bones without dismantling them. Thus, a micro-computed tomographic investigation was conducted on three feline (Felis catus) humeri specimens while the internal anatomy of the supracondylar foramina was examined. Unlike the humerus, the thin peripheral arch of the feline supracondylar foramen failed to elicit any osseous trabeculae or foci of calcification. While adhering to the humeral periosteum at its origin, the non-osseous arch, typical of a muscular tendon, attaches into the bony saddle related to the medial humeral epicondyle suggestive of a tendon or aponeurotic extension of a (vestigial) brachial muscle, with the coracobrachialis longus emerging to be the most likely candidate., Competing Interests: Competing interests The authors declare no competing or financial interests., (© 2024. Published by The Company of Biologists Ltd.)

In this paper we develop the theory of cyclic flats of q -matroids. We show that the cyclic flats, together with their ranks, uniquely determine a q -matroid and hence derive a new q -cryptomorphism. We introduce the notion of F q m -independence of an F q -subspace of F q n and we show that q -matroids generalize this concept, in the same way that matroids generalize the notion of linear independence of vectors over a given field., Competing Interests: Conflict of interestData sharing not applicable to this article as no datasets were generated or analysed during the current study. On behalf of all authors, the corresponding author states that there is no conflict of interest., (© The Author(s) 2024.)