Page 34 - 2023 Elctronic Book (3) Normal Labor_Neat

Student activities

1- What do you notice when you compare the dimensions of the pelvic inlet (Figure
3) and the pelvic outlet (Figure 4)? Which is the narrowest?

- The narrowest diameter for the fetus to pass through is the pelvic outlet, which is only

11 cm wide in the average female pelvis.

2- What do you notice about the diameters given in Figure 6, relative to the
dimensions of the pelvic canal (Figures 3 and 4)?

- At its widest part, the fetal skull is (on average) 9.5 cm wide. This is 3.5 cm less than
the widest diameter of the pelvic inlet, and 1.5 cm less than the widest diameter of the
pelvic outlet.

3- Match each anatomical name with the correct description.

The top of the fetal skull between Fused vertebrae at the back of the
the two fontanels bony pelvis
Joint between the parietal bones in Paired bones forming the front of
the fetal skull the skull
Hip bone in the pelvis
Drag each answer (above) into the correct slot (below).

Ilium
Frontal bones
Sagittal suture
Sacrum
Vertex
Answer

Ilium Hip bone in the pelvis
Frontal bones Paired bones forming the front of
the skull
Sagittal suture Joint between the parietal bones in
the fetal skull
Sacrum Fused vertebrae at the back of the
bony pelvis
Vertex The top of the fetal skull between

the two fontanels
4. Which of the following statements is false? In each case, say why it is
incorrect.

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