Although the distal sesamoidian ligaments (DSL) are found in the pastern area, functionally they are part of the suspensory system of the fetlock, in particular the oblique sesamoidian ligaments (OSL), which are a distal continuation of the branches of the common digital extensor tendon. Ultrasonography is the ancillary examination of choice for assessment of the tendinous or ligamentous conditions affecting the pastern. Ultrasonography of the DSL is easy but requires precise knowledge of the topography of the ligaments. This method of diagnostic imagery is non-invasive and easily accessible in general practice. Therefore, ultrasonography should be an element of routine evaluation of conditions affecting the pastern, the metacarpo/tarsophalangeal joints and the suspensory system of the fetlock. This article describes the technique for ultrasonographical examination of the distal sesamoidian ligaments, presents reference ultrasonographical images, and indicates the main lesions seen in clinical cases.