Quantitative Anatomy of the Growing Lungs in the Human Fetus
Table 3
Numerical data of the growing left lung.
Age [weeks]
Left lung (all parameters are expressed in millimeters [mm])
Transverse diameter
Sagittal diameter
Height
Base circumference
Anterior margin length
Posterior margin length
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Mean
SD
16
2
9.06
1.88
20.45
2.26
16.07
0.56
45.23
0.49
22.90
2.50
24.12
0.50
17
8
11.60
1.74
21.24
2.35
16.27
1.80
48.83
13.75
25.78
2.18
24.95
4.06
18
10
11.71
1.70
22.84
3.74
17.91
2.40
55.30
7.08
28.08
4.91
28.76
7.80
16–18
20
11.40(a)
1.82
21.96(a)
3.13
17.07(a)
2.16
51.71(a)
10.40
26.64(a)
4.05
26.77(a)
6.26
19
6
15.56
2.52
28.73
3.80
19.54
1.52
69.38
9.61
33.26
4.42
33.09
3.28
20
14
13.28
1.87
27.20
3.47
18.47
1.82
64.75
7.02
30.93
2.23
30.02
2.16
21
7
16.31
1.57
29.80
3.88
21.60
2.09
73.91
8.74
37.26
4.52
33.90
1.20
19–21
27
14.57(b)
2.34
28.22(b)
3.68
19.52(b)
2.21
68.29(b)
8.72
33.09(b)
4.26
31.71(b)
2.83
22
5
17.96
3.25
33.83
5.56
23.59
3.28
78.48
14.38
36.16
4.56
38.09
4.37
23
6
16.46
1.86
34.84
1.31
24.02
3.23
83.78
7.28
37.08
8.10
37.85
4.56
24
6
18.05
2.32
36.14
3.94
26.67
1.84
85.94
16.17
42.64
5.92
39.16
3.87
25
3
20.10
6.94
37.89
4.47
25.37
4.87
78.10
35.32
45.27
2.17
41.54
4.75
22–25
20
17.86(c)
3.32
35.44(c)
3.88
24.91(c)
3.18
82.25(c)
16.40
39.75(c)
6.67
38.86(c)
4.49
Note: between the three age groups of 16–18, 19–21, and 22–25 weeks, the means marked by letters (a), (b), and (c) in every column differ significantly: for transverse diameter: (a) versus (b) , (a) versus (c) , and (b) versus (c) ; for sagittal diameter: (a) versus (b) , (a) versus (c) , and (b) versus (c) ; for height: (a) versus (b) , (a) versus (c) , and (b) versus (c) ; for base circumference: (a) versus (b) , (a) versus (c) , and (b) versus (c) ; for length of anterior margin: (a) versus (b) , (a) versus (c) , and (b) versus (c) ; for length of posterior margin: (a) versus (b) , (a) versus (c) , and (b) versus (c) .
