Osteology Of The Pelvis

Question 1

What structures form the linea terminalis?

Answer 1

The acrute line, the pectineal line and the pubic crest

Question 2

What are the three bones that the hip bone is made up from?

Answer 2

The ilium, the pubis and the ischium

Question 3

What are the features of a gynecoid pelvis?

Answer 3

Round inlet, straight side walls, ischial spines not too promient, well rounded greater sciatic notch, well curved sacrum and a sub pubic arch < 90 degrees

Question 4

What is the greater pelvis?

Answer 4

The superior portion of the pelvis or the false pelvis that has no obsetric relevance

Question 5

What is the lesser pelvis?

Answer 5

The inferior portion of the pelvis is the lesser pelvis, which resides within the pelvis cavit and viscera and provides a solid and immobile bony canal junctio

Question 6

What is the pelvic inlet?

Answer 6

Marks the boundary between the greater pelvis and the lesser pelvis, and size is defined by its edge, the plvis brim, and determines the size and shape of the birth canal

Question 7

What are the boundaries of the pelvic inlet?

Answer 7

Posterior- the sacral pomontory
Lateral- the acrute line on the inner surface of the ilium
Anterior- the pubic symphysis

Question 8

What is the olliopectineal line?

Answer 8

The combined acrute and pectineal lines

Question 9

What is the pelvic outlet?

Answer 9

At the end of the lesser pelvis and at the beginning of the pelvic wall

Question 10

What is the plane of the greatest daimeter?

Answer 10

Between the middle of the posterior surface of the sympyis pubis and the junction between S2 and S3, and laterally passes the centre of the aceteauilum and the greater sciatic notch

Question 11

What is the plane of the least diameter?

Answer 11

Also known as the plane of the obsetric outlet, and passes from the lower border of the symphysis pubis anteriolly to the ischial spine laterally, to the tip of the sacum posteriorly

Question 12

How would the pelvic inlet or the obsertic conjugate be measured clincially?

Answer 12

In order to determine the narrowest fixed distance the fetus would have to negotiate, and the minimum antero-posterior distance of the pelvis inlet is measure, and the distance between the scaral pomontory and the midpoint of the pubi symphysis is known as the obsetric congjugate

Question 13

How would a clinican assess the midpelvis?

Answer 13

The clinican is testing for straight side walls, and measuring the bispinous diamtere which is part of the pelvis canal, and the width of the suprapubic agngle at the pelvic outlet can be determined by the distance between the ischial tuberosities

Question 14

How would the clinicania assess the pelvic outlet?

Answer 14

The infrapubic angle, or the distance between the ischial tuberosities

Question 15

What are two pelvic conjugates?

Answer 15

The antero posterior diameter of the pelvis

The midpoint of the pubis sympysis

Question 16

How would you determine the antero posterior diameter of the pelvis?

Answer 16

You would measure from the sacral promontory to the mid point of the pubic smyphsis

Question 17

How would you measure the diagnol conjugate?

Answer 17

Measured from the sacral promontory to the inferior border of the pubi sympysis

Question 18

What are the two most important ligaments of the pelvis ?

Answer 18

The sacrospinous ligament and the sacrotuberous ligament

Question 19

Where does the sacrospinous ligament?

Answer 19

From the ischial spine to the sacrum and the coccyx.

Question 20

Where does the sacrotuberous ligament run?

Answer 20

Connects th ischial tuberosity to the ilium, sacrum and coocyx

Question 21

What are the features of a gynceoid pelvis compared to an adroid pelvis that makes it prefereable for childbirth?

Answer 21

Wider and braoder structure but is wider, has an oval shaped inlet compared to the heart shaped android pelvis, test promience of the ischial spines allowing for a greater bispnious diameter, a greater angle in the subpubic arch, and a sacrum which is horter and less curved