Information about Ossification Of Ethmoid
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| Sagittal section of skull. (Ethmoid bone visible as white structure to left.) | ||
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The labyrinths are first developed, ossific granules making their appearance in the region of the lamina papyracea between the fourth and fifth months of fetal life, and extending into the conchæ.
At birth, the bone consists of the two labyrinths, which are small and ill-developed. During the first year after birth, the perpendicular plate and crista galli begin to ossify from a single center, and are joined to the labyrinths about the beginning of the second year.
The cribriform plate is ossified partly from the perpendicular plate and partly from the labyrinths.
The development of the ethmoidal cells begins during fetal life.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
In sciences dealing with the anatomy of animals, precise anatomical terms of location are necessary for a variety of reasons. Non-scientists often wonder why zoological and human anatomists use complex terminology to describe locations on a body, when common terms like "up",
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The ethmoid bone (from Greek ethmos, "sieve") is a bone in the skull that separates the nasal cavity from the brain. As such, it is located at the roof of the nose, between the two orbits. The cubical bone is lightweight due to a spongy construction.
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The ethmoid bone (from Greek ethmos, "sieve") is a bone in the skull that separates the nasal cavity from the brain. As such, it is located at the roof of the nose, between the two orbits. The cubical bone is lightweight due to a spongy construction.
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Ossification is the process of bone formation, in which connective tissues, such as cartilage are turned to bone or bone-like tissue. The ossified tissue is invaginated with blood vessels. These blood vessels bring minerals like calcium and deposit it in the ossifying tissue.
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lamina papyracea (or orbital lamina), which covers in the middle and posterior ethmoidal cells and forms a large part of the medial wall of the orbit.
It articulates above with the orbital plate of the frontal bone, below with the maxilla and the orbital process of
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It articulates above with the orbital plate of the frontal bone, below with the maxilla and the orbital process of
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fetus (or foetus, or fœtus) is a developing mammal or other viviparous vertebrate, after the embryonic stage and before birth. The plural is fetuses (foetuses, fœtuses) or, very rarely, foeti.
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Concha can refer to:
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- another name for the pinna
- nasal concha
- Spanish for shell
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The crista galli (Latin: "crest of the cock") is a median ridge of bone that projects from the cribriform plate of the ethmoid bone.
It is where the falx cerebri attaches anteriorly to the skull.
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It is where the falx cerebri attaches anteriorly to the skull.
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The cribriform plate of the ethmoid bone (horizontal lamina) is received into the ethmoidal notch of the frontal bone and roofs in the nasal cavities.
Projecting upward from the middle line of this plate is a thick, smooth, triangular process, the crista galli, so
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Projecting upward from the middle line of this plate is a thick, smooth, triangular process, the crista galli, so
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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