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A proper lice treatment regimen can interrupt the lice life cycle and help you get rid of the lice on your child's hair.

Get our printable guide for your next doctor's appointment to help you ask the right questions. Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life.

Updated October 15, September 11, Cynthia D. Head Lice. May ; 5 :ee Head Lice Infestation in Long Hair.

Adult Head Louse. Female Adult Head Louse. Head Louse Magnified. Spot the Head Louse. Pinpointing the Louse.

Pinpointing the Nit. Lice Life Cycle Picture. Louse Life Cycle Head lice go through these stages: A mature or adult head louse can lay up to 10 eggs or nits each day.

These nits, or lice eggs, hatch in about 7 to 12 days. Head Lice Doctor Discussion Guide Get our printable guide for your next doctor's appointment to help you ask the right questions.

Download PDF. Email the Guide Send to yourself or a loved one. Sign Up. Was this page helpful? Thanks for your feedback!

What are your concerns? Article Sources. Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles.

Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Related Articles.

Head Lice: Signs, Symptoms, and Complications. How to Identify and Treat Head Lice. Getting Through a Bout of Head Lice. Getting Rid of Pinworms.

The head portion is mainly a cell nucleus; it consists of genetic substances, called chromosomes , which are responsible for transmitting specific characteristics of an individual, such as the colour of eyes, hair, and skin.

The sperm cells have only 23 chromosomes, or half of the usual number. The sperm cells also carry the X or Y chromosome that determines the sex of the future child.

Covering the head of the sperm is a cap known as the acrosome , which contains enzymes that help sperm to enter an egg.

Only one sperm fertilizes each egg, even though ,, to ,, sperm are contained in an average ejaculation.

Each egg and sperm produced has slightly different genetic information carried in the chromosomes; this accounts for the differences and similarities between children of the same parents.

A small middle portion of the sperm contains the mitochondria. The tail of the sperm, sometimes called the flagellum , is a slender, hairlike bundle of filaments that connects to the head and middle portion.

The tail is about 50 micrometres long; its thickness of one micrometre near the mitochondria gradually diminishes to less than one-half micrometre at the end of the tail.

The tail gives the sperm cell movement. It whips and undulates so that the cell can travel to the egg. Following sperm deposition in the female reproductive tract, activation of tail movement is suppressed until the sperm is carried to within a relatively short distance of the egg.

This gives the sperm an increased chance of reaching the egg before exhausting its energy supplies. The activation of tail movements is part of the process of capacitation , in which the sperm undergoes a series of cellular changes that enables its participation in fertilization.

A fundamental change that occurs during capacitation is alkalinization of sperm cytoplasm, in which the intracellular pH levels increase, particularly in the flagellum.

This process, which is driven by the rapid movement of protons out of the cell through ion channels on the flagellum, underlies tail activation.

Proton channels on sperm flagella are primed for opening by the presence in the female reproductive tract of a substance known as anandamide , which is thought to occur in high concentrations near the egg.

Upon reaching an egg, enzymes contained within the sperm acrosome are activated, enabling the sperm to traverse the thick coat surrounding the egg the zona pellucida ; this process is known as the acrosome reaction.

The membrane of the sperm cell then fuses with that of the egg, and the sperm nucleus is conveyed into the egg. Sperm deposited in the reproductive tract of the female that do not reach the egg die.

Sperm cells may live in the human body for two or three days after mating. Sperm may also be stored in a frozen state for months or years and still retain their capacity to fertilize eggs when thawed.

The widespread nature of sexual reproduction in animals has raised intriguing questions concerning the evolutionary origins of sperm. Almost all living animals, from worms to insects to humans, possess a gene known as Boule BOULE , which functions solely in sperm production.

The presence of this gene in sea anemones —very primitive life-forms—suggests that the ability to produce sperm evolved only once, roughly million years ago.

According to studies performed in mice, the final stages of sperm maturation appear to be regulated by a gene known as Katnal1 , which is expressed by the Sertoli cells that support and nourish immature sperm within the walls of the seminiferous tubules the site of spermatogenesis.

Dysfunction of Katnal1 is suspected to underlie some instances of male infertility, and thus, the gene represents a potential target for the development of male infertility drugs as well as new forms of male contraception.

Article Media. Info Print Cite.

Mature head

Mature Head

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Thoughtful mature man with head in hands. In reality, mature head lice are about the size of a sesame seed. Note the characteristic six legs of this crawling insect.

If you magnified this louse even further, you might be able to see the small claws on the end of their legs that lice use to grasp hair.

Although this head louse is magnified, you can use the nearby strand of hair for comparison to understand how big head lice really are. This can help you to identify head lice on your child's hair during a lice infestation.

Instead of worrying when you think your child has head lice, you should first confirm that your child has head lice.

Reviewing head lice pictures like this one can help you understand what you are looking for, including live lice and nits lice eggs in your child's hair.

Can you spot the head louse in this picture of a young child with a head lice infestation? This picture is of a live head louse on a girl's head, with a red circle around the louse to make identification easy.

Nits are the eggs of lice. Nits are small, oval shaped and usually a yellowish-white color and are firmly attached to the side of hair shafts.

Simply having nits does not necessarily mean that your child has live lice, though, since some nits may be empty egg casings and some may have dead, non-infective lice embryos inside.

Nits that are close to your child's scalp are the ones that are most likely to be infective and are the ones that are thought to hatch into live lice, a process that takes six to nine days.

Continuing to get new nits, even after you have removed nits from your child's hair, is also a likely sign that your child has live lice on her hair and needs a lice treatment.

The American Academy of Pediatrics is against no-nit policies that exclude children from school because they have lice. In fact, the AAP now states that 'No healthy child should be excluded from or allowed to miss school time because of head lice.

To add to the confusion about head lice, some people only use the term nits to refer to empty egg casings and lice eggs when talking about viable lice eggs.

Others use the term nits to refer to both viable lice eggs and empty egg casings. This is an out of focus picture of a nit, or head lice egg, with a caption and red circle around the nit to make identification easy.

Did you find the nit on your own? Having a hard time figuring out what you are looking for when you think your kids have lice?

This picture of the three stages of the head lice life cycle can help.

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