Quantitative Anatomy of the Growing Lungs in the Human Fetus
Table 1
Distribution of the fetuses studied.
Fetal age [weeks]
Crown-rump length [mm]
Sex
Mean
SD
Min
Max
Male
Female
16
111.0
4.2
108.0
114.0
2
1
1
17
122.1
3.7
115.0
126.0
8
4
4
18
136.7
4.3
130.0
142.0
10
5
5
19
153.3
2.0
150.0
155.0
6
4
2
20
161.6
3.3
156.0
166.0
14
7
7
21
174.4
3.8
170.0
180.0
7
2
5
22
188.2
2.5
185.0
190.0
5
3
2
23
195.8
1.8
193.0
198.0
6
4
2
24
208.3
2.9
205.0
212.0
6
4
2
25
220.0
0.0
220.0
220.0
3
1
2
Total
67
35
32
Note: for anatomists the most objective information for estimating fetal ages is the crown-rump length, when compared to amenorrhea and ultrasound ages.
