2.1 Passage Flashcards
Narrowest portion of the pelvic INLET
Obstetric conjugate
Distance from the upper margin of the pubis to the sacral promontory
True/anatomical conjugate
Part of the pelvis above the linea terminalis wth no obstetrical significance.
False (MAjor) Pelvis
Structures of the posterior border of true pelvis
Sacrum and coccyx
Remember:
Posterior: anterior surface of sacrum, coccyx
Lateral: ischial spine/bones, sacrosciatic notch and ligament
Anterior: pubis, obturator foramen, pubic rami
Inferior: ischial tuberosity
Superior: linea terminalis
This is the joint between the sacrum and the iliac portion of innominate bones
Sacroiliac joint
What is the normal value of the obstetric conjugate?
10 cm
A pelvic joint that consists of fibrocartilage and the superior and inferior pubic ligaments
Symphysis pubis
What is the normal angle of the pubic arch?
90-100 degrees
The only AP diameter that can be measured clinically by doing an internal examination
Diagonal conjugate
The bony pelvis is made up of how many bones?
Four!
(2) innominate bones (ilium, ischium, pubis)
(1) sacrum
(1) coccyx
This position causes the greatest upward gliding movement of sacroiliac joints thus increasing the diameter of outlet by 1.5-2.0 cm
Dorsal Lithotomy Position
True conjugate = ? (formula)
TC = DC - 1.2 cm
Enumerate the different planes of the pelvis. (3)
Pelvic inlet
pelvic outlet
pelvic midplane
Actually 4 pero no OB significance daw to:
plane of greatest dimensions: AP & transverse diameter is 12.5
What is the inferior border of false pelvis?
Linea terminalis
Remember:
Posterior: lumbar vertebra
Lateral: iliac fossa
Anterior: abdominal muscles
Inferior: linea terminalis
the greatest distance between linea terminalis on either side (NV >13.5cm)
Transverse diameter of the pelvic INLET
Extend from the sacroiliac synchondrosis to the iliopectineal prominence of the opposite side of the pelvis
Oblique diameter of the pelvic inlet
OB conjugate, diagonal conjugate and true/anatomical conjugate are the _____ diameter of the pelvic inlet
antero-posterior diameter
Distance from the lower margin of the pubis to the sacral promontory. (NV > 11.5 cm)
Diagonal Conjugate
The shortest distance between the promontory of the sacrum and symphysis pubis
Obstetric conjugate
How many centimeters will you (subtract/add?) from the diagonal conjugate to get the Obstetric conjugate?
SUBRTACT 1.5-2.0 cms
This is the rounder arch formed by descending inferior rami of pubic bones at angle of 90-100 degrees
Pubic arch
Estimates pelvic inlet by internal exam
Clinical Pelvimetry
What separates the false pelvis from the true pelvis?
Linea terminalis
What do you mean by fetus is engaged?
If the BI-PARIETAL diameter of the fetal head has passed through the pelvic inlet
Identify A, B, C and E.
A = sacral promotory
B = True/anatomical conjugate
C = diagonal conjugate
E = pelvic inlet
Narrowest portion of the ENTIRE pelvis.
Pelvic midplane diameter
Pelvic midplane is at the level of what structure in the pelvis?
ischial spine
Most common type of pelvis that is found in almost 50% of women.
Gynecoid pelvis
Anterior diameter of the inlet is greater than the transverse resulting in oval anteroposteriorly. What pelvic shape?
Anthropoid
Rarest form of pelvic shape.
Platypelloid
Posterior sagittal diameter at the inlet is much shorter than the anterior sagittal diameter . What pelvic shape?
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