Inferior nasal concha
| Inferior nasal concha or inferior turbinate/turbinal | |
|---|---|
 Medial wall of left orbit. (Inferior nasal concha visible in center in yellow.) | |
 Figure 1: Lateral wall of right nasal cavity showing inferior concha in situ. (pink) | |
| Details | |
| Articulations | Ethmoid, maxilla, lacrimal and palatine bone |
| Identifiers | |
| Latin |
Concha nasi inferior, concha nasalis inferior |
| TA |
A02.1.08.001 A06.1.02.015 |
| FMA | 54736 |
The inferior nasal concha (inferior turbinated bone or inferior turbinal/turbinate) is one of the turbinates in the nose. It extends horizontally along the lateral wall of the nasal cavity and consists of a lamina of spongy bone, curled upon itself like a scroll. The inferior nasal conchae are considered a pair of facial bones. They are also termed 'inferior nasal turbinates' because they function similar to that of a turbine: As the air passes through the turbinates, the air is churned against these mucosa-lined bones in order to receive warmth, moisture and cleansing. Superior to inferior nasal concha are the middle nasal concha and superior nasal concha which arise from the cranial portion of the skull. Hence, these two are considered as a part of the cranial bones.
It has two surfaces, two borders, and two extremities.
Structure
Surfaces
The medial surface is convex, perforated by numerous apertures, and traversed by longitudinal grooves for the lodgement of vessels.
The lateral surface is concave, and forms part of the inferior meatus.
Borders
Its upper border is thin, irregular, and connected to various bones along the lateral wall of the nasal cavity.
It may be divided into three portions: of these,
- the anterior articulates with the conchal crest of the maxilla;
- the posterior with the conchal crest of the palatine;
- the middle portion presents three well-marked processes, which vary much in their size and form.
- Of these, the anterior or lacrimal process is small and pointed and is situated at the junction of the anterior fourth with the posterior three-fourths of the bone: it articulates, by its apex, with the descending process of the lacrimal bone, and, by its margins, with the groove on the back of the frontal process of the maxilla, and thus assists in forming the canal for the nasolacrimal duct.
- Behind this process a broad, thin plate, the ethmoidal process, ascends to join the uncinate process of the ethmoid; from its lower border a thin lamina, the maxillary process, curves downward and lateralward; it articulates with the maxilla and forms a part of the medial wall of the maxillary sinus.
The inferior border is free, thick, and cellular in structure, more especially in the middle of the bone.
Extremities
Both extremities are more or less pointed, the posterior being the more tapering.
Development
The inferior nasal concha is ossified from a single center, which appears about the fifth month of fetal life in the lateral wall of the cartilaginous nasal capsule.
Additional images
Lateral wall of nasal cavity, showing ethmoid bone in position.
Nasal conchae
Left maxilla. Nasal surface.
Right inferior nasal concha. Medial surface.
Right inferior nasal concha. Lateral surface.
The skull from the front.
Sagittal section of skull.
Roof, floor, and lateral wall of left nasal cavity.
The sphenopalatine ganglion and its branches.
Coronal section of nasal cavities.
Sagittal section of nose mouth, pharynx, and larynx.
Human skull. Inferior nasal concha.
Human skull. Inferior nasal concha.
References
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
External links
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Wikimedia Commons has media related to Inferior nasal concha. |
- Anatomy figure: 33:01-07 at Human Anatomy Online, SUNY Downstate Medical Center
- Anatomy diagram: 34256.000-1 at Roche Lexicon - illustrated navigator, Elsevier