Primary and secondary sexual characteristics
Secondary sex characteristics are features that appear during puberty in humans , and at sexual maturity in other animals. Secondary sex characteristics include, for example, the manes of male lions ,  the bright facial and rump coloration of male mandrills , and horns in many goats and antelopes. These characteristics are believed to be produced by a positive feedback loop known as the Fisherian runaway produced by the secondary characteristic in one sex and the desire for that characteristic in the other sex. Male birds and fish of many species have brighter coloration or other external ornaments. Differences in size between sexes are also considered secondary sexual characteristics.
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Adolescent Physical Development: Part II
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Adolescent Physical Development: Zupanick, Psy. As adolescents continue to mature they become better able to move their bodies with greater skill and precision. These movement skills are divided into two types: Gross motor skills refer to the large muscle movements of the body e. Relative to boys, adolescent girls make only modest gains in their gross and fine motor skills until approximately 14 years of age. After this point, they generally do not experience any additional improvement in their motor skills unless they are specifically training for a sport or hobby which requires these skills.
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Primary sex characteristic changes for boys include the enlargement of the testes, penis, prostate gland, and seminal vesicles. These changes normally begin to occur between the ages of 9 and 14 years. Their growth is generally completed between ages 12 and 16 years. The most significant and noticeable puberty-related change for young men is spermarche, or the first ejaculation. Spermarche generally occurs between the ages of 12 and
In view of the complexity of the process of growth and maturation, it is not surprising to find great variations among normal boys as to the time of onset of pubescence, the rate of development and the ultimate size of the genitalia. This study was undertaken in an attempt to ascertain the actual variations among normal boys and men as to the size of the testes and of the penis and the degree of development of secondary sexual characteristics. The primary sexual organs are essentially the gonads, but we shall accept the broader classification, which includes all the organs required for procreation. These in males are the testes, the epididymides, the seminal vesicles, the prostate and the duct systems. In children these primary sexual organs differ considerably in size and structure from those of adults, since they do not as yet exercise their specific function.
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