I Male Penis

I Male Penis

Scrotal development raphe of baby at

(joining time of birth of scrotal swellings)

Sexual into the labia minora and the distal part of the vagina under the influence of estrogen; and the labioscrotal swellings form the labia majora.

There are many causes of aberrant sexual development, including prenatal hormonal disturbance or imbalance, absent cellular response to androgen or estrogen, chromosomal anomalies, and gene mutations.


In the early stages of male puberty, the testicles and adrenal glands synthesize increasing amounts of androgens, which stimulate the growth of the penis and scrotum; intiate the appearance of pubic, axillary, facial, and body hair; lead to the development of apocrine sweat glands; accelerate growth and maturation of the skeleton; and increase the muscle mass. Testicular growth antedates penile growth by 6 to 12 months. Enlarging testicular volume and the subsequent testicular sensitivity to pressure are the first signs of puberty in males.

In female puberty, estrogens produced by the ovary stimulate growth of the breast, uterus, fallopian tubes, and vagina. Androgens produced by the adrenal gland stimulate the growth of pubic and axillary hair, linear growth, and skeletal maturation. Apocrine sweating is usually the first sign of puberty in females.

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