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
Describe the structure of the pubic symphysis
Hyaline cartilage on bone external to the fibrous cartilage disc
Which structures does the ischial spine separate?
The greater and lesser sciatic notch
What type of joint in the pubic symphysis
Cartilaginous joint
What are the ligaments of the sacroiliac joint called?
The anterior sacro-iliac ligament
The posterior sacro-iliac ligament
The interosseous sacro-iliac ligament
Plus accessory ligaments:
- Iliolumbar
- Sacrotuberous
Sacrospinous
What is the name of the processes that project superiorly-lateral to the promontory?
The ala
On what aspect of the ischium is the ischial tuberosity?
Posterioinferior
Where is the greater sciatic notch in relation to the Posterior inferior iliac spine?
Inferior to it
How does the shape of the pelvic inlet differ in females cf to males?
It is wider transversely
What is the function of the false pelvis?
Protect the contents of the abdominal cavity
What are the ligaments of the pubic symphysis?
The superior pubic ligament
The inferior arcuate ligament
Apart from stabilising the sacro-iliac joint, what is the function of the sacrotuberous and sacrospinous ligament?
Close the greater and lesser sciatic notches respectively, into foramen
