Lecture Notes: Anatomy of the Hip Bone and Pelvis

Overview

• Focus on the coxa bone (hip bone)
• Three divisions of the coxa bone: pubis, ischium, ilium

Divisions of the Coxa Bone

Ilium

• Orientation: Anterior side (like holding a gun with trigger finger forward), Posterior side opposite
• Key Structures:
  • Anterior Inferior Iliac Spine: Small spine on the anterior side
  • Anterior Superior Iliac Spine: Spine above the anterior inferior
  • Iliac Crest: Ridge on top
  • Iliac Fossa: Smooth surface
  • Arcuate Line: Forms part of the pelvic brim
  • Auricular Surface: Articulates with sacrum, forming sacroiliac joint
  • Posterior Superior Iliac Spine
  • Posterior Inferior Iliac Spine
  • Greater Sciatic Notch: Near the ischial spine

Ischium

• Key Structures:
  • Lesser Sciatic Notch
  • Ischial Tuberosity: Roughened surface
  • Ramus of the Ischium
  • Obturator Foramen: Large hole, largest in the body

Pubis

• Key Structures:
  • Inferior Ramus of the Pubis
  • Superior Ramus of the Pubis
  • Pubic Symphysis: Articulating surface with fibrocartilage
  • Pubic Tubercle
  • Pubic Crest

Coxa Bone Articulation

• Acetabulum: Articulates with head of femur, forms synovial ball-and-socket joint
• Gluteal Surface: Posterior side where gluteal muscles attach

Pelvis Overview

• Consists of two coxa bones articulating with the sacrum

Key Joints and Structures

• Sacroiliac Joint: Articulation with sacrum
• Pubic Symphysis: Cartilaginous joint known as symphysis joint
• Pelvic Brim: Circular outline separating false pelvis (above) from true pelvis (below)

Identification of Pelvic Type

• Pubic Arch: Used to distinguish between male and female pelvis (broad arch indicates female)

Openings

• Pelvic Inlet: Entrance to the pelvis
• Pelvic Outlet: Exit from the pelvis

Summary

• Detailed examination of the coxa bone and pelvis
• Understanding of structures, articulations, and gender differences in pelvis anatomy