Mindblown: a blog about philosophy.

A ringlike muscle that controls a natural orifice. A circular band of muscle which surrounds an opening or passage in the body, especially the anus, and can narrow or close the opening or passage by contracting. A muscle, surrounding a body opening or vessel, that can contract and close that opening. Circular band of muscle…

Wedge shaped. Relating to the sphenoid bone. Shaped like a wedge. A bone lying in the centre of the base of the skull, and supporting the others like a wedge or keystone. Having the form of a wedge. The bone with a wedge-like shape situated at the base of the skull.  

The ability of a sperm cell to swim quickly toward the ovum and fertilize it.  

A method of gender selection in which X-bearing and Y-bearing sperm are separated and the woman is artificially inseminated with the desired sperm.  

A spermicide in suppository form that effervesces or dissolves when it comes in contact with the moisture and warmth of the vagina.  

A chemical used to kill sperm.  

The tube in males that conveys the sperm from the epididymis to the seminal vesicles and urethra.  

A center where a man’s semen may be frozen and stored for later use in artificial insemination. A place where sperm can be stored for use in artificial insemination. A privately run organization that collects sperm from donors, sometimes paying a fee, and sells it to women or doctors for use in artificial insemination. Such…

Primitive male germ cells that mature into primary spermatocytes.  

The cell that undergoes two meiotic divisions to form four spermatids. An early stage in the development of a spermatozoon. A cell produced as an intermediate stage in the formation of spermatozoa. Spermatocytes develop from spermatogonia in the walls of the seminiferous tubules of the testis; they are known as either primary or secondary spermatocytes…