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The testes (singular: testis), commonly known as the testicles, are a pair of ovoid glandular organs that are central to the function of the male reproductive system.

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Continued From Above Anatomy of the Male Reproductive System Scrotum. The scrotum is a sac-like organ made of skin and muscles that houses the testes.

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Hormones & Behavior By Randy J. Nelson. The Ohio State University. The goal of this module is to introduce you to the topic of hormones and behavior. This field of study is also called behavioral endocrinology, which is the scientific study of the interaction between hormones and behavior.

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