Molecular Basis of Cellular Division: Meiosis and Spermatogenesis

Vocabulary terms covering the molecular basis of cell division, meiosis, and the physiological and clinical aspects of spermatogenesis.

Cell-cycle control system

The internal system that regulates the cell cycle including the S phase, mitosis, and cytokinesis.

Meiosis

A cellular division process consisting of first and second divisions, including the process of crossing-over, essential for sexual reproduction.

Spermatogenesis

The process of sperm production in the testes, regulated by hormonal, molecular, and somatic cell factors.

Spermiogenesis

The specific stage of spermatogenesis concerning the maturation and structural transformation of spermatozoa.

Crossing-over

A specific event during the first division of meiosis where genetic material is exchanged.

Acrosome

A specialized structure in human sperm that plays a critical role during fertilization.

Infertility Statistics

Data showing that about $15\%$ of couples struggle with infertility, with about half of cases having male origins.

Cryptorchidism

One of several male reproductive disorders that may be increasing due to the adverse effects of endocrine disruptors.

Hypospadias

A specific male reproductive disorder linked to an imbalance of androgens and estrogens in the testes.

Endocrine disruptors

Environmental substances with estrogenic or antiandrogenic effects that can lead to decreased sperm counts.

Endocrine, Paracrine, and Autocrine factors

The three types of factors that fine-tune the maintenance of the androgen and estrogen balance in the testes.

Somatic cells

Cells in the testicle that play a characterized role in supporting the process of spermatogenesis.

Pituitary, Ovaries, Hypothalamus, and Adrenal cortex

Organs and glands involved in the production of sex hormones and the regulation of spermatogenesis.

Maturation of spermatozoa

The concluding molecular and structural phase of sperm development occurring within the male reproductive system.