Nostril

A nostril (or naris /ˈnɛərᵻs/, plural nares /ˈnɛəriːz/) is one of the two channels of the nose, from the point where they bifurcate to the external opening. In birds and mammals, they contain branched bones or cartilages called turbinates, whose function is to warm air on inhalation and remove moisture on exhalation. Fish do not breathe through their noses, but they do have two small holes used for smelling, which may, indeed, be called nostrils.

The Procellariiformes are distinguished from other birds by having tubular extensions of their nostrils.

In humans, the nasal cycle is the normal ultradian cycle of each nostril's blood vessels becoming engorged in swelling, then shrinking.

The nostrils are separated by the septum. The septum can sometimes be deviated, causing one nostril to appear larger than the other. With extreme damage to the septum and columella, the two nostrils are no longer separated and form a single larger external opening.

Like other tetrapods, humans have two external nostrils (anterior nares) and two additional nostrils at the back of the nasal cavity, inside the head (posterior nares, posterior nasal apertures or choanae). Each choana contains approximately 1000 strands of nasal hair. They also connect the nose to the throat (the nasopharynx), aiding in respiration. Though all four nostrils were on the outside the head of our fish ancestors, the nostrils for outgoing water (excurrent nostrils) migrated to the inside of the mouth, as evidenced by the discovery of Kenichthys campbelli, a 395-million-year-old fossilized fish which shows this migration in progress. It has two nostrils between its front teeth, similar to human embryos at an early stage. If these fail to join up, the result is a cleft palate.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Nostril

Latest News for: nostrils

Edit

One of my nostrils is constantly blocked... what could be the cause? DR ELLIE has ...

The Daily Mail 06 Apr 2025

I recently went to A&E with a very high temperature ... This might involve an investigation called a nasoendoscopy, where a fine tube camera is inserted into the nostrils to see if there are any blockages or physical abnormalities, such as a polyp ... .

Edit

What’s the world’s largest plane and why are nostrils round? Try our kids’ quiz

The Observer 30 Mar 2025

why are nostrils round? They were square, but changed shape over time ... Nostril shape varies based on geography and climate.

Edit

Rashmika Mandanna Flaunts Her Double Chin And Nostril Hair

MENA FN 29 Mar 2025

(MENAFN - IANS) Mumbai, March 29 (IANS) Rashmika Mandanna took the netizens by surprise as she flaunted her double chin and nostril hair in her recent Instagram post.The 'Animal' actress took to her ... .

Article Search

tools

You can search using any combination of the items listed below.

Language:

Sort:

Indexed:

Search:

Duplicates:

Nostril

Podcasts:

Nostrils

ALBUMS

Only in Canada, Eh 77-81, Volume 1

Latest News for: nostrils

One of my nostrils is constantly blocked... what could be the cause? DR ELLIE has ...

What’s the world’s largest plane and why are nostrils round? Try our kids’ quiz

Rashmika Mandanna Flaunts Her Double Chin And Nostril Hair

Article Search

EXPLORE WN.com