Anatomy Flashcards
what bones make up the pelvis inlet
sacral promontory
ilium
superior pubic ramus
pubic symphysis
what bones make up the pelvic outlet
pubic symphysis ischiopubic ramus ischial tuberosities sacrotuberous ligaments coccyx
where does the inguinal ligament attach
between ASIS and pubic tubercle
what aspects of the ischium are palpable on vaginal examination
ischial spines
what are the joints of the pelvis
sacroiliac joints
hip joints
pubic symphysis
where does sacrospinous ligament attach from
sacrum and ischial spine
where does sacrotuberous ligament attach
sacrum and ischial tuberosity
what is the function of the sacrotuberous and sacrospinous ligaments
to ensure the inferior part of the sacrum is not pushed superiorly when weight is suddenly transferred vertically through the vertebral column eg when jumping or during late pregnancy
what does the presence of the sacrotuberous and sacrospinous ligaments form
the greater and lesser sciatic foraminae
what passes through the obturator canal
obturator nerve and vessels
what is moulding
the movement of one bone over another to allow the foetal head to pass through the pelvis during labour
what is the vertex
an area of the foetal skull outlined by the anterior and posterior fontanelles and the parietal eminences
what is longer the occiptofrontal or biparietal diameter
the occipitofrontal ie the foetal head is longer than it is wide
which is wider the transverse or AP diameter in the pelvic inlet
the transverse diameter is wider than AP diameter
what direction should the fetus enter the pelvic cavity
facing the right or left
in the transverse direction
what is the ‘station’ referred to as
the distance the fetal head is from the ischial spines
what does a negative station number mean
the head is superior to the ischial spines
what should happen as the foetal head descends
it should rotate and be in a flexed position ie chin on chest
which diameter is widest at the pelvic outlet
the AP diameter is wider than the transverse diameter
ideally the baby should leave the pelvic cavity in what position
occipitoanterior (OA) position
during delivery the foetal head should be in flexion or extension
in extension
once the baby’s head is delivered what happens
there is a further rotation so that the shoulders and the rest of the baby can be delivered
what is the round ligament
remnant of gubernaculum extending from uterine horns to labia majora via inguinal canal
what is the function of the round ligament
to maintain the anteverted position of the uterus
