JOINTS OF THE PELVIC GIRDLE. Articulationes cinguli pelvici.

Obturator membrane. Membrana obturatoria. Membrane which closes off the obturator foramen except for the obturator canal. It is covered by the obturator externus and internus muscles. ABCD

Obturator canal. Canalis obturatorius. Opening in the supralateral part of the obturator mem-brane.Itcorrespondstotheobturatorgroovebe-tween the two obturator tubercles and is traversed bythe obturator artery, vein and nerve. ACD

Lumbosacral joint. Articulatio lumbosacralis. Articulation between the sacrum and lumbar vertebra 5 (4). A

Iliolumbar ligament. Lig. iliolumbale. Strong ligamentthatpassestotheiliummainlyfromthe transverse processesofL4and 5.AB Sacrotuberous ligament. Lig. sacrotuberale. Strong ligament that extends from the medial margin of the ischial tuberosity to the sacrum and ilium. B D

Falciform process. Processus falciformis. Slender extension of fibers from the sacro-tuberous ligament to the inner aspect of the ischium. B D

Sacrospinous ligament. Lig. sacrospinale. Fibrous band medial to the sacrotuberous ligament. It passes from the ischial spine to the sacrum and coccyx and separates the greater from the lesser sciatic foramen. B D Greater sciatic foramen. Foramen sciaticum (ischiadicum) majus. Foramen between the greater sciatic notch, sacrum, sacrospinous ligament and the upper part of the sacrotuberous ligament. It is traversed by the piriformis muscle, superior and inferior gluteal arteries, veins and nerves, the internal pudendal vein, pudendal nerve, sciatic nerve and posterior femoral cutaneous nerve. A B D

Lesser sciatic foramen. Foramen sciaticum (ischiadicum) minus. Foramen between the lesser sciatic notch and the sacrospinous and sacrotuberous ligaments. It transmits the obturator internus muscle as well as the internal pu-dendal artery and vein and the pudendal nerve to the ischiorectal fossa. B D Sacroiliac joint. Articulatio sacroiliaca. Joint connected by fibers that permits little motion [[amphiarthrosis]]. It is located between the sacrum and the ilium and may become syn-osteotic. A

Ventral sacroiliac ligaments. Ligg. sacroiliaca anteriora (ventralia). Thin but broad fibrous bandsthatextendfromtheanteriorsurfaceofthe first and second sacral vertebrae to the ilium. AD Interosseous sacroiliac ligaments. Ligg. sacroiliaca interossea. Dorsal mass of ligaments thatpassfromthetuberosityofthesacrumtothe tuberosityofthe ilium. B

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Essentials of Human Physiology

Essentials of Human Physiology

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