Bony Pelvis Anatomy Flashcards
What does the bony pelvis consist of?
2 hip bones
sacrum
coccyx
Label this hip
Label this Ilium.
Label this Ischium.
Label the Pubis
What does the red line represent?
the pelvic inlet
What does the green dotted line represent?
the pelvic outlet
Where does the pelvic cavity lie?
within the bony pelvis
Where does the inguinal ligament attach?
Between the ASIS and the pubic tubercle
In what positions in vaginal examination can the ischial spines be felt?
4 and 8 oclock positions
Label this xray of the bony pelvis.
Label the joints of the pelvis.
Label these ligaments.
What do the sacrotuberous and sacrospinous ligaments ensure?
That the inferior part of the sacrum isnt pushed superiorly when weight is suddenly transferred vertically through the vertebral column e.g. jumping, late pregnancy
What 2 foraminae are formed by the presence of the sacrotuberous and sacrospinous ligaments?
Greater and lesser sciatic foraminae
Where do the obturator nerve and vessels pass through?
Through the obturator foramen via the obturator canal
What structures can be damaged with trauma to the bony pelvis?
common iliac artery
common iliac vein
sacral nerves/plexus
What is moulding?
The movement of one bone over another to allow the fetal head to pass through the pelvis during labour.
Sutures and fontanelles allow this to happen.
What is the largest diameter in the fetal head?
The occipitofrontal diameter (fetal head is longer than it is wide)
What is the vertex?
An area of the fetal skull - outlined by anerior and posterior fontanelles and parietal eminences
How should a fetus ideally enter the pelvic cavity?
Transverse - facing to the right or left
What is the distance of the fetal head from the ischial spines referred to as?
the station
A negative number means the head is superior to the spines (a positive number means inferior)
How should the baby leave the pelvic cavity ideally?
In an occipitoanterior position
How should the fetal head be during delivery?
In extension
How should the fetal head be as it descends through the pevlic cavity?
It should rotate and be flexed
What happens once the baby’s head is delivered?
There is further rotation so the shoulders and rest of the baby can then be delivered
What does the inguinal ligament carry?
spermatic cord (M)
round ligament of uterus and ilioinguinal nerves
What type of joint are the sacroiliac joints and what actions can they do?
synovial plane joints
sliding/gliding movements
What kind of joint is the pubic symphisis? Describe its movement.
secondary cartilagenous
symphysis - less movement than a synvial joint, more than fibrous
What kind of joint is the lumbosacral joint?
secondary cartilagenous
What kind of joint is the hip joint? What movements can it do?
synovial ball and socket joint
flexion/extension, adduction/abduction, medial/lateral rotation
WHat creates the obturator foramen?
ischuim and pubis bones
carries obturator nerve, vein and artery
Where does the sacrotuberous ligament run from?
sacrum to ischial tuberosity
Where does the sacrospinous ligament run from?
sacrum to ischial spine
What muscle goes through the greater sciatic foramen?
piriformis
Where do the femoral nerve and vessels travel through?
subinguinal space
Which nerves and vessels travel through the greater sciatic foramen?
sciatic and gluteal
Where does the iliacus muscle originate?
in the iliac fossa
Where does the sartorius muscle originate?
ASIS
