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The human nose is the first organ of the respiratory system.It is also the principal organ in the olfactory system.The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two.
It consists of a nasal cavity inside the head, and an external nose on the face. The external nose houses the nostrils, or nares, a pair of tubes providing airflow through the nose for respiration. Where the nostrils pass through the nasal cavity they widen, are known as nasal fossae, and contain turbinates and olfactory mucosa.
Both crus come together to form an oval tip at each nostril. Both sides of the major alar cartilages merge to form a notch at the tip, which is referred to as the apex of the nose. With the formation of the medial and lateral walls within the nares, the major alar cartilages function to hold open each naris.
Coronal section of nasal cavity. The superior meatus is the smallest of the three. It is a narrow cavity located obliquely below the superior concha.This meatus is short, lies above and extends from the middle part of the middle concha below.
Most species of birds have external nares located somewhere on their beak. The nares are two holes—circular, oval or slit-like in shape—which lead to the nasal cavities within the bird's skull, and thus to the rest of the respiratory system. [10] (p375) In most bird species, the nares are located in the basal third of the upper mandible.
The following outline is provided as an overview of and topical guide to human anatomy: . Human anatomy is the scientific study of the morphology of the adult human.It is subdivided into gross anatomy and microscopic anatomy.
The canal containing the duct is called the nasolacrimal canal.It is formed by indentations in the inferior nasal conchae, maxilla and lacrimal bone.The canal drains into the nasal cavity through the anterior portion of the inferior meatus, which is between the inferior concha and the floor of the nasal cavity.
It is exposed in rear view of the articulated skull. It forms most of the occipital condyle, a rounded process connecting the skull to the atlas, the first vertebra of the neck. Above, it is fused with the paired exoccipitals. It also forms the posterior part of the floor of the braincase, being fused with the basisphenoid at its front. [20]