The Pelvis

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15 Terms

1
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How many vertebra does the sacrum have

5 fused vertebra

2
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4 Ant. Features of the sacrum

Transverse lines, ant. sacral foramen, sacral alar, sacral promontory

3
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7 Post. Features of the sacrum

Median sacral crest
Lateral sacral crest
Post. sacral foramen
Sacral canal
Sacral Hiatus
Auricular surfaces
Sup. articular facets

4
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What fused bones make up the innominates

Ilium, Ischium, Pubis

5
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Joints of the pelvis

Ant - pubic symphysis
Post - sacro-illiac
Sup - lumbosacral junction
Inf - sacroccocgeal

6
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Features of the Male Pelvis

Thicker and heavier, tilted post, ilium deeper, sacrum narrower and longer, ASIS closer & less flared, oval/round obturator foramen, pubic symphysis longer

7
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Features of the Female Pelvis

Smaller, tilted ant, shallower ilium, sacrum shorter & wider, ASIS further apart, more flared, shorter pubic symphysis.

8
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Define Pelvic Inlet

Sup pelvic aperture, the upper opening of the true pelvis, forming a boundary between the abdominal cavity and the pelvic cavity.

9
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What makes up the pelvic brim

formed by sacral promontory, arcuate line, pectineal line, pubic crest.

10
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Define pelvis outlet

Inf pelvic aperture, inf pubic rami, ischial tuberosities, tip of coccyx.

11
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What is the greater/false pelvis define its borders

Sup to the pelvic inlet, formed by the iliac crest, alae of ilium, and ant aspect of S1. part of the abdominal cavity and supports the abdominal organs.

12
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What is the lesser/true pelvis and define its borders

Between the pelvic inlet and outlet. The coccyx, pubic symphysis, lower part of the ilium, Houses pelvic organs.

13
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What is the pelvic girdle

A basin shaped ring of bones connecting the spine to the femurs.

14
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How does the shape of the sacrum contribute to stability

Overall wedge shape fits between the two innominate bones.

15
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Movements of the sacrum

nutation and counter nutation.