Flashcards in Anatomy Deck (166)
What does the bony pelvis consist of?
2 hip bones
What is each hip bone a fusion of?
What is the ischiopubic ramus made up of?
Both ischium and pubis
What ligament attaches to the pubic tubercle?
Where does the inguinal ligament attach between?
The ASIS and pubic tubercle
Where are the ischial spines palpable?
On vaginal examination, at about a finger breadth into the vagina (approx. 4 and 8oclock positions)-also pudendal nerve
Where are the attachments of the sacrospinous ligament?
Sacrum and ischial spine
Where are the attachments of the sacrotuberous ligament?
Sacrum and ischial tuberosity
What is the function of the sacrotuberous and sacrospinous ligaments?
Ensure inferior sacrum is not pushed superiorly when weight is suddenly transferred vertically through vertebral column (eg. jumping, later pregnancy)
What 2 foraminae do the sacrotuberous and sacrospinous ligaments form?
Greater and lesser sciatic foraminae
What forms the pelvic inlet?
Superior pubic ramus
What forms the pelvic outlet?
What part of the pelvic cavity does levator ani form?
Pelvic floor- musculofascial inferior part
What are the functions of the pelvis?
Upper body support
Transference of weight from vertebral column to femurs
Attachment for muscles of location and abdo wall
Attachment for external genitalia
Protection of pelvic organs and associated structures
Passage for childbirth
What are the key differences between the female and male pelvis?
AP and transverse diameters are larger
Subpubic angle is wider
Pelvic cavity is shallower
What is moulding?
The movement of one bone over another to allow the foetal head to pass through the pelvis during labour
Moulding is allowed due to the presence of what?
Sutures and fontanelles
What is the vertex?
An area of foetal skull- outlined by the anterior and posterior fontanelles and the parietal eminences
Which is longer-the occipofrontal diameter or the biparietal?
At the pelvic inlet, is the transverse of AP diameter wider?
The foetus should enter the pelvic cavity facing what direction?
Either right or left (transverse)
What is the station?
The distance of the foetal head from the ischial spines
-ve means head is superior, +ve means head is inferior
What should the foetal head do whilst descending through the pelvic cavity?
Be in a flexed position e.g. chin on chest
At the pelvic outlet is the AP or transverse diameter wider?
In what position should the baby ideally leave the pelvic cavity?
During delivery should the foetal head be in flexion or extension?
What happens once baby's head is delivered?
There is a further rotation so that the shoulders and rest of the baby can then be delivered
What parts of the female reproductive system are within the pelvic cavity?
Superior part of vagina
What parts of the female reproductive system are within the perineum?
Inferior part of vagina