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Y4R2 - Obstetrics I 🤰 > L1: Female Pelvis > Flashcards

L1: Female Pelvis Flashcards

1
Q

Bony Pelvis is formed of ……

A
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2
Q

Position of False Pelvis

A
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3
Q

Boundaries of False Pelvis

A
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4
Q

Importance of False Pelvis

A
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5
Q

Site of True Pelvis

A
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6
Q

Parts of True Pelvis

A
  • Pelvic inlet.
  • Pelvic cavity.
  • Pelvic outlet.
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7
Q

What are another names of Pelvis Inlet?

A

Pelvic Brim or Superior Striat

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8
Q

Plane of Pelvic Inlet

A

Imaginary line joining the following points:

Upper border of symphysis pubis.
Superior pubic ramus.
Iliopectineal eminence.
Iliopectineal line.
Sacroiliac joint.
Ala of sacrum.
Pubic tubercle.
Pubic crest.
Promontory of sacrum.
Other points on opposite side.

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9
Q

Axis of Pelvic Inlet

A
  • Represented by imaginary line perpendicular to center of plane of pelvic inlet.
  • If this line extends upwards, it will pass to umbilicus & if it extends downwards, it will pass to tip of coccyx.
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10
Q

Pelvic Inclination

  • Def
A
  • Plane of pelvic inlet makes angle of 40-60° (average 55) with horizontal line in standing position.
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11
Q

Pelvic Inclination

  • Measurment
A
  • Measured in X-ray by measuring angle () pelvic brim & anterior surface of Ls (normally = 135°).
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12
Q

Pelvic Inclination

  • Importance
A
  • The higher the pelvic inclination, the more favorable vaginal delivery.
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13
Q

Pelvic Inclination

  • Diameters
A

All (except diagonal conjugate) are measured only radiologically.

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14
Q

Pelvic Brim Index

A
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15
Q

Diameters of Pelvic Inlet

A
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16
Q

Diameters of Pelvic Inlet

  • AP
A
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17
Q

Diameters of Pelvic Inlet

A
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18
Q

Diameters of Pelvic Inlet

  • Transverse
A
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19
Q

Diameters of Pelvic Inlet

  • Other Diameters
A
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20
Q

Length of True Conjugate (Anatomical AP - Conjugata Vera)

A

11cm

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21
Q

Extent of True Conjugate (Anatomical AP - Conjugata Vera)

A
  • Tip of sacral promontory

to

  • Posterior part of upper border of symphysis pubis
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22
Q

Importance of True Conjugate (Anatomical AP - Conjugata Vera)

A

Divided by anatomical transverse diameter into:

  • Anterior sagittal diameter of inlet (7 cm)
  • Posterior sagittal diameter of inlet (4 cm)
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23
Q

Length of Obstetric Conjuate Diameter

A

10.5 cm

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24
Q

Extent of Obstetric Conjuate Diameter

A
  • Tip of sacral promontory

to

  • Most bulging point on posterior surface of symphysis pubis
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25
Q

Importance of Obstetric Conjuate Diameter

A
  • Most important A-P diameter it is the shortest one through which fetus must pass)
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26
Q

Length of Diagonal Conjugate Diameter

A

12.5 cm

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27
Q

Extent of Diagonal Conjugate Diameter

A
  • Tip of sacral promontory

to

  • Lower border of symphysis pubis
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28
Q

Importance of Diagonal Conjugate Diameter

A
  • Can be measured clinically & approximate length of true conjugate is calculated by subtracting 1.5 cm.
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29
Q

Length of Anatomical Transverse Diameter

A

13 cm

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30
Q

Extent of Anatomical Transverse Diameter

A

() 2 farthest points on iliopectineal line

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31
Q

Importance of Anatomical Transverse Diameter

A

Divides true conjugate into:

  • Anterior sagittal diameter of inlet (7 cm)
  • Posterior sagittal diameter of inlet (4 cm)
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32
Q

Length of Obstetric transverse Diameter

A

12 cm

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33
Q

Extent of Obstetric transverse Diameter

A

Bisects true conjugate diameter

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34
Q

Importance of Obstetric transverse Diameter

A

The available transverse diameter for head (the shortest)

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35
Q

Length of Oblique Diameters

A

12 cm

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36
Q

Extent of Oblique Diameters

A
  • Sacroiliac joint on one side

to

  • Iliopectineal eminence on the other side.
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37
Q

Importance of Oblique Diameters

A

Named (Rt or Lt) according to joint & Lt diameter is slightly shorter than Rt due to:

  • More frequent use of Rt leg,
  • Encroachment of sigmoid colon on Lt diameter.
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38
Q

Length of Sacrocotyloid Diameters

A

9-9.5 cm

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39
Q

Extent of Sacrocotyloid Diameters

A
  • Center of sacral promontory.

to

  • Iliopectineal eminence
40
Q

Importance of Sacrocotyloid Diameters

A

Named (Rt or Lt) according to eminence

41
Q

Boundaries of Pelvic Cavity

A
42
Q

Boundaries of Plane of Greatest Pelvic Dimensions

A
43
Q

Boundaries of Plane of Obstetric Midpelvis

A
44
Q

Boundaries of Plane of Least Pelvic Dimensions

A
45
Q

Plane of Greatest Pelvic Dimensions is the ……. part of the pelvis and is almost ………

A

Roomiest - Circular

46
Q

Plane of Greatest Pelvic Dimensions

  • Diameters
A
  • AP
  • Transverse
47
Q

Plane of Greatest Pelvic Dimensions

  • AP Diameter
A
48
Q

Plane of Greatest Pelvic Dimensions

  • Transverse Diameter
A
49
Q

Plane of Greatest Pelvic Dimensions

  • Importance
A
  • Internal rotation of the head occurs when the biparietal diameter occupies this wide plane of pelvis
  • Disimpaction of the head to this plane is done before manual rotation in cases of occipito posterior position
50
Q

Plane of Obstetric Midpelvis

  • Diameters
A
51
Q

Plane of Obstetric Midpelvis

  • AP Diameter
A
52
Q

Plane of Obstetric Midpelvis

  • Inter-spinous Diameter
A
53
Q

Plane of Obstetric Midpelvis

  • Anterior Sagittal Diameter
A
54
Q

Plane of Obstetric Midpelvis

  • Posterior Sagittal Diameter
A
55
Q

Plane of Obstetric Midpelvis

  • Importance
A
56
Q

Plane of Least Pelvic Dimensions

  • Diameters
A
  • AP
  • Transverse
57
Q

Plane of Least Pelvic Dimensions

  • AP
A
58
Q

Plane of Least Pelvic Dimensions

  • Transverse Diameter
A
59
Q

Plane of Least Pelvic Dimensions

  • Importance
A
  • At this plane, the obstetrics pelvic axis turns forwards.
  • The vertex is considered engaged when the lowermost bony part reaches this plane (ischial spines).
60
Q

What is another name of Pelvic Outlet?

A

Inferior Striat

61
Q

Types of Pelvic Outlet

A

Anatomical & Obstetric

62
Q

Def of Anatomical Outlet

A
  • Lozenge shaped formed of 2 triangles at 2 different planes with common base formed by bituberous diameter.
63
Q

Triangles & Boundaries of Anatomical Outlet

A
64
Q

Anatomical Outlet

  • Anterior Sagittal Triangle
A
65
Q

Anatomical Outlet

  • Posterior Sagittal Triangle
A
66
Q

Diameters of Anatomical Outlet

A
  • AP
  • Transverse (bituberous)
  • Anterior Sagittal
  • Posterior Sagittal
67
Q

Diameters of Anatomical Outlet

  • AP
A
68
Q

Diameters of Anatomical Outlet

  • Transverse (Bituberous)
A
69
Q

Diameters of Anatomical Outlet

  • Anterior Sagittal
A
70
Q

Diameters of Anatomical Outlet

  • Posterior Sagittal
A
71
Q

Thorn’s (Klein’s) Dictum

A
  • To allow average sized fetal head to pass through pelvic outlet → bituberous diameter + posterior sagittal diameter of pelvic outlet must be > 15 cm provided that bituberous diameter is > 8 cm.
72
Q

Def of Obstetric Outlet

A

Segment of pelvis bounded above by plane of least pelvic dimensions & below by anatomical outlet.

73
Q

Boundaries of Obstetric Outlet

A
74
Q

Diameters of Obstetric Outlet

A
  • AP
  • Transverse (Bispinous)
75
Q

Diameters of Obstetric Outlet

  • AP
A
76
Q

Diameters of Obstetric Outlet

  • Transverse (Bispinous)
A
77
Q

Types of Pelvic Axis

A
  • Anatomical (Curve of Carus)
  • Obstetric
78
Q

Anatomical Pelvic Axis

A
79
Q

Obstetric Pelvic Axis

A
80
Q

Diameters of Bony Pelvis (Summary)

  • Pelvic Inlet
A
81
Q

Diameters of Bony Pelvis (Summary)

  • Plane of GPD
A

12 cm all round

82
Q

Diameters of Bony Pelvis (Summary)

  • Plane of MP
A
83
Q

Diameters of Bony Pelvis (Summary)

  • Plane of LPD
A
84
Q

Diameters of Bony Pelvis (Summary)

  • Anatomical Outlet
A
85
Q

Classification of Female Pelvis

A
86
Q

Classification of Female Pelvis is based on ……

A

Caldwell & Moloy have classified female pelvises based on radiological studies into four types

87
Q

Gynecoid Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
88
Q

Android Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
89
Q

Anthropoid Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
90
Q

Platypelloid Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
91
Q

Compare between Gtnecoid, Android, Anthropoid, Platypelloid Pelvis in terms of:

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
92
Q

Incidence of Gynecoid Pelvis

A

50 %

93
Q

Pelvic Inlet in Gynecoid Pelvis

A

oval

94
Q

Pelvic Inlet in Android Pelvis

A
  • Triangular with narrow anterior segment & wide flat posterior segment
95
Q

Head Engagment in Android Pelvis

A

In transverse diameter

Y4R2 - Obstetrics I 🤰 (52 decks)

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