Marieb Chapter 7 - 5.3c

Bones of the pelvic girdle

Introduction

  • pelvic girdle → formed by 2 coxal bones (hip bones) + sacrum

  • pelvis → 2 coxal bones, sacrum + coccyx

  • Sacrum and hip bones (PG bones) are attached to the axial skeleton through sacral attachments of L5

  • sockets receive femur head; ligaments reinforce them

  • function PG → weight bearing

  • Pelvis → protect reproductive organs, urinary bladder, part of large intestine

Hip bone

  • fusion of 3 bones

    1) Ilium → it connects posteriorly with the sacrum with the sacroiliac joint, moving anteriorly, the “ala” is called the iliac crest (ASIS - AIIS + PSIS - PIIS), below the PIIS there is the greater sciatic notch

    2) ischium → located posterior and inferior, moving inferiorly we find the ischial tuberosity and on top of it the ischial spine

    3) pubis → located anteriorly and inferiorly, the pubic bones articulate anteriorly together through the pubic symphysis, the ramis of the pubis are fused with the posterior ischium and form the obturator foramen

  • The ilium, the ischium, and the pubis fuse at a deep socket called the acetabulum which receives the caput femoris

  • differences between female and male pelvis

    The pelvis is divided into 2 regions:

    • false p.

    • true p. (outlet, inlet cavity)

articulated pelvis