L1: Female Pelvis Flashcards
1
Q
Bony Pelvis is formed of ……
A
2
Q
Position of False Pelvis
A
3
Q
Boundaries of False Pelvis
A
4
Q
Importance of False Pelvis
A
5
Q
Site of True Pelvis
A
6
Q
Parts of True Pelvis
A
- Pelvic inlet.
- Pelvic cavity.
- Pelvic outlet.
7
Q
What are another names of Pelvis Inlet?
A
Pelvic Brim or Superior Striat
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.
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.
10
Q
Pelvic Inclination
- Def
A
- Plane of pelvic inlet makes angle of 40-60° (average 55) with horizontal line in standing position.
11
Q
Pelvic Inclination
- Measurment
A
- Measured in X-ray by measuring angle () pelvic brim & anterior surface of Ls (normally = 135°).
12
Q
Pelvic Inclination
- Importance
A
- The higher the pelvic inclination, the more favorable vaginal delivery.
13
Q
Pelvic Inclination
- Diameters
A
All (except diagonal conjugate) are measured only radiologically.
14
Q
Pelvic Brim Index
A
15
Q
Diameters of Pelvic Inlet
A
16
Q
Diameters of Pelvic Inlet
- AP
A
17
Q
Diameters of Pelvic Inlet
A
18
Q
Diameters of Pelvic Inlet
- Transverse
A
19
Q
Diameters of Pelvic Inlet
- Other Diameters
A
20
Q
Length of True Conjugate (Anatomical AP - Conjugata Vera)
A
11cm
21
Q
Extent of True Conjugate (Anatomical AP - Conjugata Vera)
A
- Tip of sacral promontory
to
- Posterior part of upper border of symphysis pubis
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)
23
Q
Length of Obstetric Conjuate Diameter
A
10.5 cm
24
Q
Extent of Obstetric Conjuate Diameter
A
- Tip of sacral promontory
to
- Most bulging point on posterior surface of symphysis pubis
25
Importance of **Obstetric Conjuate Diameter**
- Most important A-P diameter it is the shortest one through which fetus must pass)
26
Length of **Diagonal Conjugate Diameter**
12.5 cm
27
Extent of **Diagonal Conjugate Diameter**
- Tip of sacral promontory
to
- Lower border of symphysis pubis
28
Importance of **Diagonal Conjugate Diameter**
- Can be measured clinically & approximate length of true conjugate is calculated by subtracting 1.5 cm.
29
Length of **Anatomical Transverse Diameter**
13 cm
30
Extent of **Anatomical Transverse Diameter**
() 2 farthest points on iliopectineal line
31
Importance of **Anatomical Transverse Diameter**
Divides true conjugate into:
- Anterior sagittal diameter of inlet (7 cm)
- Posterior sagittal diameter of inlet (4 cm)
32
Length of **Obstetric transverse Diameter**
12 cm
33
Extent of **Obstetric transverse Diameter**
Bisects true conjugate diameter
34
Importance of **Obstetric transverse Diameter**
The available transverse diameter for head (the shortest)
35
Length of **Oblique Diameters**
12 cm
36
Extent of **Oblique Diameters**
- Sacroiliac joint on one side
to
- Iliopectineal eminence on the other side.
37
Importance of **Oblique Diameters**
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.
38
Length of **Sacrocotyloid Diameters**
9-9.5 cm
39
Extent of **Sacrocotyloid Diameters**
- Center of sacral promontory.
to
- Iliopectineal eminence
40
Importance of **Sacrocotyloid Diameters**
Named (Rt or Lt) according to eminence
41
Boundaries of **Pelvic Cavity**
42
Boundaries of **Plane of Greatest Pelvic Dimensions**
43
Boundaries of **Plane of Obstetric Midpelvis**
44
Boundaries of **Plane of Least Pelvic Dimensions**
45
Plane of Greatest Pelvic Dimensions is the ....... part of the pelvis and is almost .........
Roomiest - Circular
46
**Plane of Greatest Pelvic Dimensions**
- Diameters
- AP
- Transverse
47
**Plane of Greatest Pelvic Dimensions**
- AP Diameter
48
**Plane of Greatest Pelvic Dimensions**
- Transverse Diameter
49
**Plane of Greatest Pelvic Dimensions**
- Importance
- 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
**Plane of Obstetric Midpelvis**
- Diameters
51
**Plane of Obstetric Midpelvis**
- AP Diameter
52
**Plane of Obstetric Midpelvis**
- Inter-spinous Diameter
53
**Plane of Obstetric Midpelvis**
- Anterior Sagittal Diameter
54
**Plane of Obstetric Midpelvis**
- Posterior Sagittal Diameter
55
**Plane of Obstetric Midpelvis**
- Importance
56
**Plane of Least Pelvic Dimensions**
- Diameters
- AP
- Transverse
57
**Plane of Least Pelvic Dimensions**
- AP
58
**Plane of Least Pelvic Dimensions**
- Transverse Diameter
59
**Plane of Least Pelvic Dimensions**
- Importance
- 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
What is another name of **Pelvic Outlet**?
Inferior Striat
61
Types of **Pelvic Outlet**
Anatomical & Obstetric
62
Def of **Anatomical Outlet**
- Lozenge shaped formed of 2 triangles at 2 different planes with common base formed by bituberous diameter.
63
Triangles & Boundaries of **Anatomical Outlet**
64
**Anatomical Outlet**
- Anterior Sagittal Triangle
65
**Anatomical Outlet**
- Posterior Sagittal Triangle
66
Diameters of **Anatomical Outlet**
- AP
- Transverse (bituberous)
- Anterior Sagittal
- Posterior Sagittal
67
Diameters of **Anatomical Outlet**
- AP
68
Diameters of **Anatomical Outlet**
- Transverse (Bituberous)
69
Diameters of **Anatomical Outlet**
- Anterior Sagittal
70
Diameters of **Anatomical Outlet**
- Posterior Sagittal
71
Thorn's (Klein's) Dictum
- 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
Def of **Obstetric Outlet**
Segment of pelvis bounded above by plane of least pelvic dimensions & below by anatomical outlet.
73
Boundaries of **Obstetric Outlet**
74
Diameters of **Obstetric Outlet**
- AP
- Transverse (Bispinous)
75
Diameters of **Obstetric Outlet**
- AP
76
Diameters of **Obstetric Outlet**
- Transverse (Bispinous)
77
Types of **Pelvic Axis**
- Anatomical (Curve of Carus)
- Obstetric
78
Anatomical **Pelvic Axis**
79
Obstetric **Pelvic Axis**
80
Diameters of Bony Pelvis (Summary)
- Pelvic Inlet
81
Diameters of Bony Pelvis (Summary)
- Plane of GPD
12 cm all round
82
Diameters of Bony Pelvis (Summary)
- Plane of MP
83
Diameters of Bony Pelvis (Summary)
- Plane of LPD
84
Diameters of Bony Pelvis (Summary)
- Anatomical Outlet
85
Classification of **Female Pelvis**
86
Classification of **Female Pelvis** is based on ......
Caldwell & Moloy have classified female pelvises based on radiological studies into four types
87
**Gynecoid Pelvis**
- Incidence
- Pelvic Inlet
- Sacrum
- Pelvic Cavity
- Sunpubic Angle
- Head Engagment
- Pelvic Reserve Capacity
- Clinical Importance
88
**Android Pelvis**
- Incidence
- Pelvic Inlet
- Sacrum
- Pelvic Cavity
- Sunpubic Angle
- Head Engagment
- Pelvic Reserve Capacity
- Clinical Importance
89
**Anthropoid Pelvis**
- Incidence
- Pelvic Inlet
- Sacrum
- Pelvic Cavity
- Sunpubic Angle
- Head Engagment
- Pelvic Reserve Capacity
- Clinical Importance
90
**Platypelloid Pelvis**
- Incidence
- Pelvic Inlet
- Sacrum
- Pelvic Cavity
- Sunpubic Angle
- Head Engagment
- Pelvic Reserve Capacity
- Clinical Importance
91
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
92
Incidence of **Gynecoid Pelvis**
50 %
93
Pelvic Inlet in **Gynecoid Pelvis**
oval
94
Pelvic Inlet in **Android Pelvis**
- Triangular with narrow anterior segment & wide flat posterior segment
95
Head Engagment in **Android Pelvis**
In transverse diameter
