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2. Micropenis - Wikipedia

   en.wikipedia.org/wiki/Micropenis

   A micropenis is an unusually small penis. A common criterion is a dorsal (measured on top) penile length of at least 2.5 standard deviations smaller than the mean human penis size. [1] A micropenis is stretched penile length equal to or less than 1.9 cm (0.75 in) in term infants, and 9.3 cm (3.67 in) in adults.

3. Tanner scale - Wikipedia

   en.wikipedia.org/wiki/Tanner_scale

   Defines physical measurements of development. The Tanner scale (also known as the Tanner stages or sexual maturity rating ( SMR )) is a scale of physical development as children transition into adolescence and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics, such ...

4. Human penis size - Wikipedia

   en.wikipedia.org/wiki/Human_penis_size

   Distribution of penis sizes by circumference. 81% of erect penises (green) are between 10 and 13 cm in circumference. [2] While results vary slightly across reputable studies, the consensus is that the mean human penis, when erect, is in the range 12.9–15 cm (5.1–5.9 in) in length.

5. Hypospadias - Wikipedia

   en.wikipedia.org/wiki/Hypospadias

   Hypospadias is a common variation in fetal development of the penis in which the urethra does not open from its usual location on the head of the penis. It is the second-most common birth defect of the male reproductive system, affecting about one of every 250 males at birth, although when including milder cases, is found in up to 4% of newborn males.

6. Erection - Wikipedia

   en.wikipedia.org/wiki/Erection

   Erection. Three columns of erectile tissue make up most of the volume of the penis. An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors ...

7. Human penis - Wikipedia

   en.wikipedia.org/wiki/Human_penis

   Human penis. In human anatomy, the penis ( / ˈpiːnɪs /; pl.: penises or penes; from the Latin pēnis, initially "tail" [1]) is an external male sex organ ( intromittent organ) that serves as a passage for excretion of urine and ejaculation of semen. The main parts are the root, body, the epithelium of the penis including the shaft skin, and ...