Difference between revisions of "Pelvis - Anatomy & Physiology"
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<big><center>[[Musculoskeletal System - Anatomy & Physiology|'''BACK TO MUSCULOSKELETAL ANATOMY AND PHYSIOLOGY''']]</center></big> | <big><center>[[Musculoskeletal System - Anatomy & Physiology|'''BACK TO MUSCULOSKELETAL ANATOMY AND PHYSIOLOGY''']]</center></big> | ||
+ | ==Pelvic Girdle== | ||
+ | *Two symmetrical halves: hip bones ('''ossa cosarum''') meet at pelvic symphysis ventrally and articulate with sacrum dorsally | ||
+ | *Hip Bones: | ||
+ | **Three bones develop from separate ossifications within a single cartilage plate | ||
+ | **'''Ilium''': craniodorsal, extends obliquely forward from hip to articulate with sacrum | ||
+ | ***Cranial wing varies between species | ||
+ | ***Dorsally, forms '''sacral tuber''' more prominent in large animals than dogs and cats | ||
+ | ***Ventrally, forms '''tuber coxae''', or the point of the hip | ||
+ | ***Margin of the wing is known as the '''iliac crest''' | ||
+ | ***Body is deeply excavated for attachment of the gluteus medius | ||
+ | ***'''Greater Sciatic Notch''' on dorsal border of the wing is cut away at its junction with the shaft to allow the sciatic nerve passage en route to the hind limb | ||
+ | **'''Pubis''': extends medially from the joint to form cranial pelvic floor | ||
+ | ***L-shaped to give two branches: cranial (acetabular) and caudal (symphysial) | ||
+ | **'''Ischium''': caudal, forms most of pelvic floor | ||
+ | ***'''Ischial tuberosity''' is formed by the caudolateral corner of the horizontal plate of the ischium | ||
+ | **The '''Pelvic Symphysis''' comprises both pubis and ischium | ||
+ | **The '''Acetabulum"" provides the socket to the joint of the hip, and is comprised of all three bones of the pelvis | ||
+ | *Species differences: | ||
+ | **Larger species have a more vertical ilium, bringing the sacroiliac joint (and with it the weight of the trunk) closer to the hip | ||
+ | **Smaller species have an oblique ilium | ||
+ | |||
+ | ==Pelvic Joints== |
Revision as of 12:24, 25 July 2008
Pelvic Girdle
- Two symmetrical halves: hip bones (ossa cosarum) meet at pelvic symphysis ventrally and articulate with sacrum dorsally
- Hip Bones:
- Three bones develop from separate ossifications within a single cartilage plate
- Ilium: craniodorsal, extends obliquely forward from hip to articulate with sacrum
- Cranial wing varies between species
- Dorsally, forms sacral tuber more prominent in large animals than dogs and cats
- Ventrally, forms tuber coxae, or the point of the hip
- Margin of the wing is known as the iliac crest
- Body is deeply excavated for attachment of the gluteus medius
- Greater Sciatic Notch on dorsal border of the wing is cut away at its junction with the shaft to allow the sciatic nerve passage en route to the hind limb
- Pubis: extends medially from the joint to form cranial pelvic floor
- L-shaped to give two branches: cranial (acetabular) and caudal (symphysial)
- Ischium: caudal, forms most of pelvic floor
- Ischial tuberosity is formed by the caudolateral corner of the horizontal plate of the ischium
- The Pelvic Symphysis comprises both pubis and ischium
- The Acetabulum"" provides the socket to the joint of the hip, and is comprised of all three bones of the pelvis
- Species differences:
- Larger species have a more vertical ilium, bringing the sacroiliac joint (and with it the weight of the trunk) closer to the hip
- Smaller species have an oblique ilium