Mechanism of Birth / pelvic Anatomy

Question 1

Involution of the uterus

Question 2

What are three spaces of pelvis

Answer 2

1. Pelvic Brim
   
   • horizontal ​almond shaped
   • (Transverse (13cm), Oblique (12cm), AnteroPosterior (11cm))
2. Pelvic cavity
   
   • ​​full circle
   • 12cm diameter - 360degrees
3. Pelvic outlet
   
   1. ​vertical almond
   2. Anteroposterior 13cm, oblique (12cm), Transverse (11cm)

Question 3

what are 4 bones of pelvis

Answer 3

• 2 inominate bones
  
  • • ilium, the ischium and the pubic
• 1 Sacrum
  
  • curved/ hollow space
• 1 Cocyx

Question 4

Label right hip bone

Question 5

what is Engagement

Answer 5

when the widest part of the head (9.5cm) has passed through pelvic brim

Question 6

name 2 fontanelles and their shapes

Answer 6

Bregma (Anterior / diamond shape)

Question 7

label fetal skull

Answer 7

2 fontanelles

• bregma (diamond, anterior), lambda (triangle, posterior)
• 4 bones- Frontal, temporal, parietal, occipital

4 sutures- Frontal, Coronal, Sagittal,Lamdoidal

Question 8

Moulding

Answer 8

when fetal cranial bones move / “override” at suture points, to reduce head size during labour

can take some time to settle back