Yogabody by Judith Hanson Lasater

Author:Judith Hanson Lasater
Language: eng
Format: epub, mobi
Publisher: Rodmell Press
Published: 2010-10-04T16:00:00+00:00

BONES

The pelvis is made up of three bones, the largest of which is the ilium, which forms the broad, flat bone of the pelvis. On the medial side of the ilia is a fossa known as the iliac fossa, where the iliacus muscle originates. The top of the ilia is called the iliac crest; it can be felt at the lower side waist (Figure 8.1).

The ability to locate the bony landmarks on the pelvis, both visually and tactilely, can make helping your student easier. Two important bony landmarks are found on the ilia. In the front of the body is the knobby anterior superior iliac crest. You can feel this at the lateral side of the low abdomen; sometimes when you lie on your belly it will poke the floor. The other landmark is the posterior superior iliac crest. It is found just over the sacroiliac joint on the posterior side of the body. Below each of these prominences is found a smaller crest, the anterior and the posterior inferior iliac crest, respectively (Figure 8.2).

The ischium makes up one-third of the pelvis and provides the two, rounded, firm ends of the pelvis on which we sit, the ischial tuberosities. Another important bony landmark on the ischium is the greater sciatic notch, made up in part of the ischium and the ilia. The greater sciatic notch is the passageway for the sciatic nerve to exit the pelvis. Distal to the greater sciatic notch is the lesser sciatic notch. This latter notch is converted into a true foramen by the sacrotuberous and sacrospinous ligaments; it allows for the passage of the tendon of the obturator internus muscle as well as nerves and blood vessels. The greater sciatic notch provides the opening for the passage of the sciatic nerve as well as for the piriformis muscle.

The third bone of the pelvis is the pubic bone, which also makes up one-third of the pelvis. The two rami (arms) of the pubis join with the ischium. On the anterior portion of the pubic bone is the pubic tubercle, a prominence that serves as the attachment for muscles. A rami of the pubic bone and a rami of the ischium join to create the obturator foramen. The obturator vessels and nerves exit the pelvis through this opening.

The front lower wall of the pelvis is created by the pubic symphysis, which is the union of the left and right anterior pubic rami. The pubic symphysis is composed of strong ligaments which hold the pubic rami together but which soften during pregnancy due to hormones and which separate slightly to allow for the passage of the baby from the pelvis.

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