27 Oct Mechanisms of birth and stages and phases of labour

Identify premonitory signs, mechanisms of birth and stages and phases of labour. Desc=n: station described in- :ev_1 01 , r_sentin_ part (head) in the pelvis. b. Engagement presenting part passes pelvic inlet . Flexion head should ve ile ed to ; a_s met easily d. internal Rotation: as fetus is ,, ished downward by contractions. the curved cylindrical shape of the pelvis ca. ses fetal head to turn unt.’ the occiput is di. ectly under the symphysis pubis e. Extension changes rom fle: ion to exter sion so it can . operl , negotiate the curve. I he head pivots Restitution and External rotation: when the nead is born in e tension the _houlders are crosswise in the pelvis. I he head spontaneously tur_ to one side as it realign. with the shoulders (estitution). I he shoulders then rotate within the pel. is u til their transverse diameter is aligned with the mothers ante opusterio. pelvis. g. Expulsion: anterior then posterio. shoulder are born, follow.ed y lit.ly by body