Pelvis
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| Bone: Pelvis | |
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| Female type pelvis from Gray's Anatomy | |
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| Male type pelvis from Gray's Anatomy | |
| Gray's | subject #57 236 |
| Dorlands / Elsevier |
p_10/12623123 |
The (pelvis pl. pelvises or pelves) is the bony structure located at the base of the spine (properly known as the caudal end). It is part of the appendicular skeleton. Each os coxae (hipbone) consists of three bones: the ilium, ischium, and the pubis. The ilium is the largest and upper most part, the ischium is the posterior-inferior (back-lower) part, and the pubis is the anterior (front) part of the hipbone. The two hipbones are joined anteriorly at the symphysis pubis and posteriorly to the sacrum. The pelvis incorporates the socket portion of the hip joint for each leg (in bipeds) or hind leg (in quadrupeds). It forms the lower limb (or hind-limb) girdle of the skeleton.
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[edit] Pelvic cavity
The pelvic cavity is a body cavity that is bounded by the bones of the pelvis and which primarily contains reproductive organs, the urinary bladder, and the rectum. The lesser pelvis (or "true pelvis") only includes structures inferior to the pelvic brim. The greater pelvis (or "false pelvis") is the expanded portion of the cavity situated above and in front of the pelvic brim. The sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones.
[edit] Sex differences
- Infrapubic angle is greater than 90˚ in females and less than 90˚ in males.
- Pelvic inlet in males is more heart-shaped, while in females it is more round or oval.
- Greater sciatic notch narrower in males.
- Acetabulum in males faces more laterally, while it faces more anteriorly in females.
- Sacrum more triangular and shorter in females.[1]
There are four main types of pelvis
- Gynaecoid
- Normal female pelvis
- Round with enlarged transverse diameter
- Android
- Normal male pelvis
- Heart shaped
- Anthropoid
- Long anterior to posterior diameter
- Platypelloid
- Long transverse diameter
[edit] Additional images
 Radiograph of a healthy human hip joint |
 Median sagittal section of pelvis. |
 Articulations of pelvis. Anterior view. |
 Articulations of pelvis. Posterior view. |
 Left hip-joint, opened by removing the floor of the acetabulum from within the pelvis. |
[edit] See also
- Bone terminology
- Terms for anatomical location
- Hip fracture
- Lesser pelvis
- Greater pelvis
- Pelvic cavity
- Pelvic fracture
- Pelvic Bone Width
- Coccyx (tailbone)
[edit] References
- ^ Saukko P, Knight B. Knight's Forensic Pathology, 3rd Ed. Edward Arnold Ltd. 2004. ISBN 0-340-76044-3.
[edit] External links
- Pelvis at eMedicine Dictionary
- Coccyx pain, tailbone pain, coccydynia (Peer-reviewed medical chapter, available free online at eMedicine)
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