Motor Points for the Neuromuscular Blockade of the Subscapularis Muscle

Graphical representation of data from the 20 subscapularis dissections. The graph is shown as an overlay to a pen drawing of a scapula. The axes are thus shown with the vertex of the inferior angle as point (0,0) and the acromial tip on the x axis. All data are plotted as proportions relative to the distance between the inferior angle and the acromial tip. The motor points are displayed as a scatter plot (red diamonds), and the line of best fit is shown as a solid black line (y=1.48x–0.743). The line of best fit transects the x axis at .50. The position of the medial spines in each dissection is also shown (blue diamonds), with the mean position shown by the black diamond.

Mock-up of proposed injection technique. Abbreviations: AT, acromial tip; IA, inferior angle; MS, medial spine. Legend: —, imaginary line connecting IA with AT; ---, the path of the injection needle bisects this and aims for the mid-point between the MS and AT.