Articulations of the Pelvis

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Anatomy > Gray's Anatomy of the Human Body > III. Syndesmology > 5i. Articulations of the Pelvis

Henry Gray (1821–1865). Anatomy of the Human Body. 1918.

Articulations of the Pelvis[edit | edit source]

FIG. 322—Anterior sacral segment (coronal section)
FIG. 323—Middle sacral segment (coronal section)

The ligaments connecting the bones of the pelvis can be grouped into:

1. Sacroiliac Articulation (Articulatio sacroiliaca)[edit | edit source]

This amphiarthrosis occurs between the auricular surfaces of the sacrum and ilium, with intervening cartilage—thicker on the sacral side. These surfaces are closely united by fibrocartilage and interosseous fibers, and occasionally present a synovial joint cavity, giving it diarthrodial characteristics.

Ligaments of the Sacroiliac Joint[edit | edit source]

2. Sacroischial Ligaments[edit | edit source]

These include:

Function and Boundaries[edit | edit source]

These ligaments convert the greater sciatic notch and lesser sciatic notch into foramina.

3. Sacrococcygeal Symphysis[edit | edit source]

An amphiarthrosis between the sacrum and coccyx, with a fibrocartilaginous disk. Ligaments include:

4. Pubic Symphysis (Symphysis pubica)[edit | edit source]

An amphiarthrosis formed between the two pubic bones, supported by:

FIG. 321—Coronal section of the symphysis pubis. (Gray's Anatomy)

Articulations of the Pelvis[edit | edit source]

Mechanism of the Pelvis[edit | edit source]

The pelvis serves to:

  • Support and transmit the weight of the upper body
  • Provide attachment surfaces for muscles
  • Protect pelvic organs

Weight Transmission[edit | edit source]

The weight from the vertebral column is transmitted through:

The sacrum acts as a wedge, stabilizing the pelvis against:

FIG. 324—Posterior sacral segment (coronal section)

Sacral Segments[edit | edit source]

  • Anterior segment – Slightly wedge-shaped; almost parallel articular surfaces
  • Middle segment – Strong wedge-shaped with locking ridges
  • Posterior segment – Reverse wedge shape; less interlocking

Movement and Pregnancy Adaptation[edit | edit source]

See Also[edit | edit source]

Gray's Anatomy[edit source]

Anatomy atlases (external)[edit source]

[1] - Anatomy Atlases

Adapted from the Classic Grays Anatomy of the Human Body 1918 edition (public domain)

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