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Reproductive System > Osteology Of The Pelvis > Flashcards

Osteology Of The Pelvis Flashcards

1
Q

How many bones make up the pelvis and what are they?

A

4
2 innominate bones
Sacrum
Coccyx

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2
Q

What are the different parts to the innominate bone?

A

Ischium
Ilium
Pubis

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3
Q

Which parts make up the linea terminalis?

A

Arcuate line
Pectineal line
Pubic crest

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4
Q

What is the sacral promontory?

A

Anterior superior projection of the 1st sacral vertebra into the pelvic cavity

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5
Q

Describe a good pelvis for childbirth

A

Gynecoid pelvis
Round inlet, straight side wells, ischial spines not too prominent, well rounded greater sciatic notch, well-curved sacrum and sub-pubic arch >90

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6
Q

What is the false pelvis?

A

The greater pelvis
Superior to the linea terminalis
Accommodates the growing foetus

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7
Q

What is the true pelvis?

A

Lesser pelvis
Bony canal
Solid and immobile

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8
Q

What is the pelvic inlet?

A

Maximum distance anterior to posterior

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9
Q

What is the bispinous diameter?

A

Between the 2 ischial spines

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10
Q

What is the pelvic outlet?

A

Distance between the ischial tuberosities

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11
Q

What is the obstetric conjugate?

A

The absolute diameter
Sacral promontory to mid point of pubic symphysis
Cannot palpate this clinically so must use diagonal conjugate

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12
Q

What is the diagonal conjugate?

A

Approximate of obstetric conjugate
Sacral promontory to inferior border of pubic symphysis
Marginally an overestimation

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13
Q

What are the 2 main ligaments of the pelvis?

A

Sacrospinous lig

Sacrotuberous lig

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14
Q

How does the pelvic outlet stretch in pregnancy?

A

Lots of progesterone and relaxin released
Soften the CTs
Additional stretch added to the pelvic outlet

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15
Q

What do we call the most female and male looking pelvises?

A 
Male = android 
Female = gynecoid
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16
Q

Describe a highly android pelvis

A 
Pelvic inlet more heart shaped
Sacral promontory more prominent
Increased projection of ischial spines
Bispinous diameter much smaller
Narrow linea terminalis 
More acute sub-pubic angle (50-60)
Less rounded greater sciatic notch

Reproductive System (17 decks)

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