Laumonerie P, et al. - Ultrasound-guided regional anesthesia (USRA) and a landmark-based approach (LBA) were done in 15 shoulders each from 15 cadavers (total of 30 shoulders) by the researchers in order to compare the exactitude of distal suprascapular nerve (dSSN) blockade performed with the use of USRA vs with an LBA and to explain the anatomic features of the sensory branches of the dSSN. With USRA and the LBA, respectively, the tip of the needle was recognized at 1.3 cm and 1.5 cm. In 27 cases, staining diffused past the origin of the most proximal sensory branch. The most proximal sensory branch began 2.5 cm from the suprascapular notch. The sensory branches also failed to be marked in the 3 failures that happened in the USRA group. All 30 dSSNs had 3 sensory branches, which innervated the posterior glenohumeral capsule, the subacromial bursa, and the coracoclavicular and acromioclavicular ligaments. Hence, for an anesthetic blockade of the dSSN, an LBA was concluded to be as reliable and valid as US guidance. In order to include the 3 sensory branches in the anesthetic blockade, the marking of the suprascapular nerve should be proximal to the suprascapular notch.