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From Barnes (1975) by permission.

From Barnes (1975) by permission.

Figure 10.3(d) Racial differences in female pubertal development. Prevalence of breast development at Tanner stage 2 or greater by age and race; prevalence of pubic hair development at Tanner stage 2 or greater by age and race; and prevalence of menses by age and race. Adapted from Hermann-Giddens et al. (1997).

Figure 10.3(d) Racial differences in female pubertal development. Prevalence of breast development at Tanner stage 2 or greater by age and race; prevalence of pubic hair development at Tanner stage 2 or greater by age and race; and prevalence of menses by age and race. Adapted from Hermann-Giddens et al. (1997).

Uncircumsised Tanner Stages
Age (years)

Chapter 10 Genitalia Penile Length

Definition The length of the gently stretched penis from the base of the tip.

Landmarks Measure from the base of the penis (pubic ramus) to the tip of the glans with the penis gently stretched. The glans of the penis may need to be palpated through the foreskin in individuals who are not circumcised. Alternatively, the foreskin can be retracted (Fig. 10.4).

Instruments A straight-edged clear plastic ruler, a tape-measure, or blunt calipers.

Position Any comfortable position.

Remarks The penis may appear small if there is a ventral insertion of the scrotum (shawl scrotum or webbing of the penis). This anomaly is believed to be due to failure of the scrotal swelling to shift caudally in fetal life. This penis is buried within the scrotal fold but can be palpated and is usually of normal size.

Pitfalls If the fat pad at the base of the penis is not depressed so that the ruler touches the pubic ramus, a falsely short penile length will be perceived. If the penis is not gently stretched as a measurement is taken, the length of the penis may be as much as 2 cm shorter.

Figure 10.4 Measurement of penile length.

Figure 10.4 Measurement of penile length.

Weeks Small Gestational Age

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Gestational age (weeks)

Figure 10.5 Penile length, 28-41 gestational weeks. From Feldmann and Smith (1975), by permission.

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Gestational age (weeks)

Figure 10.5 Penile length, 28-41 gestational weeks. From Feldmann and Smith (1975), by permission.

Figure 10.6 Penile length, 1 to 16 years. From Schonfeld (1943), by permission.

Figure 10.6 Penile length, 1 to 16 years. From Schonfeld (1943), by permission.

Penis Circumference
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Age from birth (years)
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