The medial surface of the
labyrinth of ethmoid
The ethmoidal labyrinth or lateral mass of the ethmoid bone consists of a number of thin-walled cellular cavities, the ethmoid air cells, arranged in three groups, anterior, middle, and posterior, and interposed between two vertical plates of bone ...
consists of a thin
lamella, which descends from the under surface of the
cribriform plate
In mammalian anatomy, the cribriform plate (Latin for lit. '' sieve-shaped''), horizontal lamina or lamina cribrosa is part of the ethmoid bone. It is received into the ethmoidal notch of the frontal bone and roofs in the nasal cavities. It s ...
, and ends below in a free, convoluted margin, the middle nasal concha (middle nasal turbinate).
It is rough, and marked above by numerous grooves, directed nearly vertically downward from the cribriform plate; they lodge branches of the
olfactory nerves, which are distributed to the
mucous membrane
A mucous membrane or mucosa is a membrane that lines various cavities in the body of an organism and covers the surface of internal organs. It consists of one or more layers of epithelial cells overlying a layer of loose connective tissue. It ...
covering the
superior nasal concha
The superior nasal concha is a small, curved plate of bone representing a medial bony process of the labyrinth of the ethmoid bone. The superior nasal concha forms the roof of the superior nasal meatus.
Anatomy
Anatomical relations
The super ...
.
The middle turbinates insert anteriorly into the
frontal process of the
maxilla
In vertebrates, the maxilla (: maxillae ) is the upper fixed (not fixed in Neopterygii) bone of the jaw formed from the fusion of two maxillary bones. In humans, the upper jaw includes the hard palate in the front of the mouth. The two maxil ...
and posteriorly into the
perpendicular plate of the
palatine bone
In anatomy, the palatine bones (; derived from the Latin ''palatum'') are two irregular bones of the facial skeleton in many animal species, located above the uvula in the throat. Together with the maxilla, they comprise the hard palate.
Stru ...
.
There are three mutually perpendicular segments of the middle turbinate: from proximal to distal, there is the horizontal segment (
axial plane
A transverse plane is a plane that is rotated 90° from two other planes.
Anatomy
The transverse plane is an anatomical plane that is perpendicular to the sagittal plane and the dorsal plane. It is also called the axial plane or horizontal ...
), the basal lamella (
coronal plane
The dorsal plane (also known as the coronal plane or frontal plane, especially in human anatomy) is an anatomical plane that divides the body into Anatomical terms of location#Dorsal and ventral, dorsal and ventral sections. It is perpendicular t ...
), and the vertical segment (
sagittal plane
The sagittal plane (; also known as the longitudinal plane) is an anatomical plane that divides the body into right and left sections. It is perpendicular to the transverse and coronal planes. The plane may be in the center of the body and divi ...
).
Additional images
File:Illu nose nasal cavities.jpg, Nose and nasal cavities
File:Gray152.png, Ethmoid bone from the right side.
File:Gray196.png, Roof, floor, and lateral wall of left nasal cavity.
File:Gray780.png, The sphenopalatine ganglion and its branches.
File:Gray859.png, Coronal section of nasal cavities.
File:Gray994.png, Sagittal section of nose, mouth, pharynx, and larynx.
File:Nasenmuscheln1.JPG, Nasal conchae
See also
*
Nasal concha
In anatomy, a nasal concha (; : conchae; ; Latin for 'shell'), also called a nasal turbinate or turbinal, is a long, narrow, curled shelf of bone tissue, bone that protrudes into the breathing passage of the nose in humans and various other anim ...
References
External links
*
*
upstate.edu - Frontal* - lateral
* - coronal
*
Bones of the head and neck
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