The knee joint, the most complex one among synovial joints, has very essential functions in carrying and moving body weight in mammals.However, due to the fact that it consists of more than two bones, the incompatibility of the femorotibial joint surfaces, menisci and extra ligaments is needed (Dursun, 2008;König & Liebich, 2007). This situation causes the formation of specific problems of all structures belonging to the joint. These problems can be given as examples of various diseases such as cruciate ligament ruptures (Hayashi et al., 2004), patellar luxation (Wangdee, 2014), chondromalacia (Goodfellow et al., 1976), osteoarthritis (McAlindon et al., 1992), osteochondrosis (Grøndalen, 1974 and meniscus tears (Fox et al., 2015). As a result of the diseases, both limitation of movement or immobility and severe pain occur in the joint (Kidd, 2006;Sanchez-Ramirez et al., 2013). Diseases of the knee joint may develop due to traumatic causes (Hayashi et al., 2004), nutritional disorders (Joseph et al., 2020 and congenital anomalies (Cave & Staples, 1941;Kılıç et al., 2008). In the treatment of knee joint problems, surgical operations are often used in addition to conservative treatments (Bhave

This study was conducted to reveal the anatomical and histological features of left and right septomarginal trabeculae in the heart of the Hatay mountain gazelle. In the study, two female and two male adult Hatay mountain gazelle hearts were used. For this purpose, the materials detected in 10% formaldehyde solution were stained with Crossman's modified triple staining technique and examined under a light microscope after anatomical examinations and measurements were made. The presence of trabeculae in both ventricles was demonstrated. While the number of septomarginal trabeculae was 1 in each of the samples in the right ventricle, it was determined that it was 2 in each of three hearts and 3 in one heart in the left ventricle. It was observed that the right trabeculae were unbranched and fleshy, while the left trabeculae were filamentous and mostly branched. The lengths and thicknesses of the right trabeculae were measured 12–17 mm and 3–4 mm and the lengths and thicknesses of the left trabeculae were measured 6–15 mm and 0.5–1 mm. In the histological examination of both trabeculae, connective tissue, Purkinje fibres and blood vessels were observed, in addition, it was detected that the right trabeculae had myocardial fibres. Few capillaries were found in the left trabecula, while both more capillaries and blood vessels were found in the right trabeculae.