The Pelvis Flashcards
Which bony structures form the pelvis?
2 x innominate “hip” bones sacrum Coccyx Acetabulum Obturator foramen pubic symphysis
What is the coccyx?
Very bottom portion of the spine below the sacrum
- tail bone
What is the acetabulum?
Hip joint socket
What is the obturator foramen?
Large opening created by the ischium and pubis bones of the pelvis through which nerves and blood vessels pass
What is the pubic symphysis ?
The union of innominate bones
Symphysis is a secondary cartilaginous joint
- Relaxes during childbirth allowing room for baby head
What are the 3 parts of the hip bone?
Ileum - top part
Ischeum - bum bone
Pubis - anterior facing
How does a child’s pelvis differ from an adults?
The pelvic bones are separate - not fused yet to allow room for growth
Acetabulum is deeper
Which structures form the pelvic aperture?
pubic symphysis pubic crest pectineal line (attached to pectineus muscle) arcuate line (inside ileum) sacral alae sacral promontory (protrudes anteriorly)
What is the lesser/true pelvis?
Where pelvic / genitourinary organs are
Space enclosed by pelvic girdle and below pelvic brim
What is the greater/false pelvis?
Larger and superior to the lesser pelvis
Part the gut rests on
How do female pelves differ from males?
Wider to allow childbirth
Wider true pelvis margins
Sub pubic notch below pubic symphysis at obtuse angle
Greater sciatic notch in females
Describe the iliac crest
Extends posteriorly from ASIS (anterior superior iliac spne) to the PSIS (posterior superior iliac spine)
What is the pelvic aperture?
The line dividing the pelvis into Greater/false and Lesser/true
aka. pelvic brim/ pelvic inlet
