Pelvis

Lesser Sciatic Notch

Lesser Sciatic Notch The structure indicated is the lesser sciatic notch. The lesser sciatic notch lies below the ischial spine, and is converted into the lesser sciatic foramen by the sacrospinous and sacrotuberous ligaments. The greater sciatic notch lies between the ischial spine (inferiorly) and the posterior inferior iliac spine (superiorly). The sacrospinous ligament which attaches from the ischial spine to the lateral aspect of the sacrum and coccyx converts the greater sciatic notch into the greater sciatic foramen. The following structures pass through the lesser sciatic foramen: Tendon of obturator internus Nerve to obturator internus Internal pudendal vessels Pudendal …

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lesser sciatic notch

Ischiocavernosus

Ischiocavernosus The structure indicated is the ischiocavernosus muscle. The ischiocavernosus muscle is one of three pairs of muscles in the superficial perineal pouch: Ischiocavernosus Bulbospongiosus Superficial transverse perineal muscles It originates from the inner aspect of the ischiopubic ramus and attaches on either side to the crura of the penis and clitoris. Origin: Ischiopubic ramus – internal aspect Insertion: Crus of penis and clitoris Action: Stabilise erect penis Innervation: Pudendal nerve Learn more about the pelvic floor in this tutorial
ischiocavernosus

Pubic Tubercle

Pubic Tubercle The structure indicated is the pubic tubercle. The pelvic bone consists of three components: Ilium Pubis Ischium The pubis is the anterior and inferior part of the pubic bone and consists of a body connected to two branches (rami) – a superior ramus and an inferior ramus. Several muscles of the abdomen and thigh attach to the superior pubic ramus. The pubic tubercle serves as a point of attachment for the medial aspect of the inguinal ligament. Learn more about the bones of the pelvis in this anatomy tutorial.
pubic tubercle

Arcuate Line of Pelvis

Arcuate Line of Pelvis The structure indicated is the arcuate line of the pelvis. The pelvic bones consist of three parts: Ilium Ischium Pubis The arcuate line is found on the medial surface of the ilium. The ilium is the most superiorly positioned bone of the pelvis. The medial surface of the ilium is divided into superior and inferior parts by a ridge – the anterior part of this ridge is known as the arcuate line and forms part of the border of the pelvic inlet. The arcuate line lies below the iliac fossa, and below the iliacus muscle of the …

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arcuate line of pelvis

Greater Sciatic Notch

Greater Sciatic Notch The structure indicated is the greater sciatic notch of the pelvis. The greater sciatic notch les between the ischial spine (inferiorly) and the posterior inferior iliac spine (superiorly). The sacrospinous ligament which attaches from the ischial spine to the lateral aspect of the sacrum and coccyx converts the greater sciatic notch into the greater sciatic foramen. The lesser sciatic notch lies below the ischial spine, and is converted into the lesser sciatic foramen by the sacrospinous and sacrotuberous ligaments. The piriformis muscle passes through the greater sciatic foramen and divides it into two spaces: Greater sciatic foramen …

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greater sciatic notch

Acetabulum

Acetabulum The structure indicated is the acetabulum of the pelvis. The acetabulum is formed from the point joining the three bones of the pelvis (ilium, ischium and pubis), and is the site of articulation with the head of the femur. The femoroacetabular articulation is known as the hip joint. The acetabulum consists of two parts: Articular part Non-articular part The non-articular part consists of the acetabular fossa and the acetabular notch inferiorly. The ligamentum teres attaches at one end to the acetabular notch, and at the other end to the fovea capitis of the femur. The articular part forms a …

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Acetabulum

Internal Iliac Artery

Internal Iliac Artery The structure indicated is the internal iliac artery. The abdominal aorta bifurcates into the left and right common iliac arteries at approximately the level of the fourth lumbar vertebra. The common iliac arteries then divide into the external and internal iliac arteries. The internal iliac artery has an anterior trunk and posterior trunk. The branches of these trunks are anatomically variable and have several different configurations from person to person. The posterior trunk gives rise to three branches: Iliolumbar artery Lateral sacral arteries Superior gluteal artery The branches of the anterior trunk are much more variable, but …

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Internal iliac artery

Obturator Foramen

Obturator Foramen The obturator foramen is indicated in this diagram. The obturator foramen lies inferior to the acetabulum of the pelvis and is an opening between the ischium and pubic bones. It is covered almost entirely by the obturator membrane. A small gap is left between the superior margin of the obturator membrane and the pelvic bone above, known as the obturator canal, which allows a few vessels and nerves to pass out from the pelvic cavity to communicate with the lower limb. There are three structures which pass through the obturator canal: Obturator artery Obturator vein Obturator nerve Learn …

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obturator foramen

Posterior Inferior Iliac Spine

Posterior Inferior Iliac Spine The structure indicated is the posterior inferior iliac spine of the pelvic bone. The pelvic bone consists of three parts: Ilium Ischium Pubis The posterior part of the ilium consists of two bony spines. Superiorly is the posterior superior iliac spine, and inferiorly is the posterior inferior iliac spine. Anteriorly is the anterior superior iliac spine and the anterior inferior iliac spine. Learn more about the anatomy of the pelvic bones in this tutorial.
Posterior inferior iliac spine

Anterior Inferior Iliac Spine

Anterior Inferior Iliac Spine The structure indicated is the anterior inferior iliac spine of the pelvic bone. The pelvic bones consist of three parts: Ilium Ischium Pubis The anterior part of the ilium consists of two bony spines. Superiorly is the anterior superior iliac spine (ASIS), and inferiorly is the anterior inferior iliac spine. Posteriorly is the posterior superior iliac spine and the posterior inferior iliac spine. The rectus femoris muscle of the quadriceps group of thigh muscles attaches to the anterior inferior iliac spine, as well as the iliofemoral ligament. Learn more about the anatomy of the pelvic bones …

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pelvis - anterior inferior iliac spine