Gross anatomy observation: The trunk of the obturator nerve passes through the obturator externus muscle about 3 cm inferiolaterally to the pubic tubercle and divides into anterior and posterior branches, both of which travel superficial (anterior branch) and deep (posterior branch) to the adductor brevis muscle. The anterior branch sends more branches to gracilis, adductor longus and adductor brevis muscles, whereas the posterior branch goes to adductor magnus.
In this manuscript, we will use the NEP of adductor brevis muscle (NEP4) as a representative for analysis (Fig.
The anterior obturator nerve branch initially passes through the interfascial plane between the pectineus and adductor brevis muscles. Further caudad, it runs between the adductor longus and adductor brevis muscles, innervating the adductor longus, adductor brevis, and gracilis muscles (Figure 1(a)).