Bones and Joints of the Pelvis Flashcards
Where does the pubic tubercle lie in relation to the pubic crest?
At its lateral edge
What is the shape of the pelvic outlet in females? Does it differ in males?
Diamond
No
What structures form the plane of least dimensions?
Ischial spine
S4
Base of pubic bone/pubic symphysis
Which muscles reinforce the pubic symphysis?
The obliques and rectus muscle and aponeurosis
Adductor longus
What movement is nutation?
Rotation of the sacro-iliac joint where the top of the sacrum moves in and the bottom moves out thereby opening the outlet. Counter-nutation is the opposite
How does the babies face change orientation as it travels out of the birth canal?
It faces laterally in the inlet and
Posteriorly in the outlet
In what orientation does the iliac fossa face?
Anteriomedially
What structures line the pelvic inlet, from anterior to posterior
The pubic symphysis
Pubic crest
Pectineal line of pubis
Arcuate line of ilium
Sacroiliac joint
Ala
Promontory
What are the two most common pelvic shapes in males?
Android
Anthropoid
What runs along the superior pubic ramus?
The superior pectineal line
Compare the subpubic angle in males and females
The angle is acute in males while it is obtuse in females
Which aspect of the pubic bone does the ramus of the ischium connect with?
The inferior pubic ramus
How does the articular surface of the sacroiliac joint appear?
Auricular shaped
Has a smooth articular component and rough area for ligament attachment
What structures form the boundaries for the pelvic outlet?
The inferior angle of the pubic symphysis anteriorly
The two ischial tuberosities laterally
The coccyx posteriorly
What demarcates the false and true pelvis?
The iliopectineal line
