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The pectineal line of pubic bone or linea pectinea ossis pubis in Latin (‘pectinea’ meaning comb) is a sharp, oblique, ridge-like line, found on the pectineal surface of the lateral part of the superior pubis ramus. Together with the pubic crest, it forms the pelvic brim. In some texts, it may be referred to as the pecten pubis.
Its medial end serves as an attachment for both the conjoint tendon and the lacunar ligament. The rest of its surface however, attaches to the strong fibrous pectineal ligament. The areolar tissue separates the smooth pelvic surface from the parietal peritoneum, in which the lateral umbilical ligament descends forwards along the ramus and the vas deferens laterally passes backwards. The obturator groove that is transformed into a canal by the upper borders of the obturator membrane and obturator muscles, transmits the obturator vessels and nerve from the pelvis to the thigh. At the lateral end of the obturator crest, some fibers of the pubofemoral ligament are attached.
The pectineal line also serves as a site for various muscular attachments: the proximal origin of the pectineus (a muscle in the femoral triangle), and the psoas minor that attaches to the center. The internal oblique and the transversus abdominis muscles of the anterolateral abdominal wall, also partially insert into the pectineal line via the conjoint ligament.
Latin synonyms: Pecten ossis pubis
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