 The study examined the fascial compartmentation of the superficial scapula capsule, SSE, and determined the distribution of type 1 and 2 fibres within it. It also verified the fascial compartmentation of the SSE using cadaveric simulation and provided an anatomical reference for efficient injection of botulinum toxin into the SSE. The study found that the SSE has two distinct fascial compartments, one superior and one inferior, with different proportions of slow fast muscle fibres. The superior compartment is more likely to be involved in early onset internal rotation, while the inferior compartment is more likely to provide stability to the glenohumeral joint. This article was authored by Tai Hai On Cho, Jun Hong, and Han Mu Yang.