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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. This picture shows the three stages of the head lice life cycle, including the head lice egg or nit, nymph, and adult louse, as compared to the size of a penny for scale.

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 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. Submit Feedback. Thank you for your feedback. The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree See Article History.

Alternative Titles: spermatozoa, spermatozoan, spermatozoon. Britannica Quiz. Get exclusive access to content from our First Edition with your subscription.

Subscribe today. Learn More in these related Britannica articles:. There is a commercial demand for the ability to predetermine the sex of livestock.

For example, a producer may want female calves from the best cows for replacements and male calves for beef production. Dairy producers may want more females for replacing cows or….

Gametes such as ova, sperm, and pollen begin as germ cells, which, like other types of cells, have two copies of each gene in their nuclei.

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Mature head

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.

This picture shows the three stages of the head lice life cycle, including the head lice egg or nit, nymph, and adult louse, as compared to the size of a penny for scale.

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.

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