Frontal bone


Frontal bone
Bone: Frontal bone
Frontal bone.png
Frontal bone highlighted in red
Latin os frontale
Gray's subject #33 135
Articulations twelve bones: the sphenoid, the ethmoid, the two parietals, the two nasals, the two maxillæ, the two lacrimals, and the two zygomatics  
MeSH Frontal+Bone

The frontal bone is a bone in the human skull that resembles a cockleshell in form, and consists of two portions:[1]

  • a vertical portion, the squama frontalis, corresponding with the region of the forehead.
  • an orbital or horizontal portion, the pars orbitalis, which enters into the formation of the roofs of the orbital and nasal cavities.

Contents

Embryology

The frontal bone is presumed to be derived from neural crest cells.[2]

Borders

The border of the squama frontalis is thick, strongly serrated, bevelled at the expense of the inner table above, where it rests upon the parietal bones, and at the expense of the outer table on either side, where it receives the lateral pressure of those bones; this border is continued below into a triangular, rough surface, which articulates with the great wing of the sphenoid. The posterior borders of the orbital plates are thin and serrated, and articulate with the small wings of the sphenoid. [1]

Frontal bone

In other animals

In most vertebrates, the frontal bone is paired, rather than presenting the single, fused structure found in humans. It typically lies on the upper part of the head, between the eyes, but in many non-mammalian animals it does not form part of the orbital cavity. Instead, in reptiles, bony fish and amphibians it is often separated from the orbits by one or two additional bones not found in mammals. These bones, the prefrontals and postfrontals, together form the upper margin of the eye sockets, and lie to either side of the frontal bones.[3]

See also

External links

References

  1. ^ a b Gray's Anatomy (1918). (See infobox)
  2. ^ Kirby, ML; Waldo, KL. Circulation (1990) 82:332-340.
  3. ^ Romer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. pp. 226–241. ISBN 0-03-910284-X. 

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.


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Look at other dictionaries:

  • frontal bone — n. the bone comprising the front part of the skull and forming the forehead in humans: see SKULL …   English World dictionary

  • Frontal bone — The large bone that makes up the forehead and supplies the upper edge and roof of the orbit (eye socket). The frontal bone articulates (comes together) with a number of other bones including the parietal, nasal, ethmoid, maxillary, and zygomatic… …   Medical dictionary

  • frontal bone — noun the large cranial bone forming the front part of the cranium: includes the upper part of the orbits • Syn: ↑os frontale, ↑forehead • Hypernyms: ↑membrane bone • Part Holonyms: ↑cranium, ↑braincase, ↑ …   Useful english dictionary

  • frontal bone — the bone forming the forehead and the upper parts of the orbits; it contains several air spaces (frontal sinuses: see paranasal sinuses). At birth it consists of right and left halves, joined by a suture that usually closes during infancy. See:… …   The new mediacal dictionary

  • frontal bone — noun Date: 1741 a bone that forms the forehead and roofs over most of the orbits and nasal cavity and that at birth consists of two halves separated by a suture …   New Collegiate Dictionary

  • frontal bone — Anat. a broad membrane bone of the skull, forming the forehead and the upper portion of each orbit. See diag. under skull. [1735 45] * * * …   Universalium

  • frontal bone — noun The bone of the forehead …   Wiktionary

  • frontal bone — noun the bone which forms the front part of the skull and the upper part of the eye sockets …   English new terms dictionary

  • frontal bone — fron′tal bone′ n. anat. the broad front part of the skull, forming the forehead • Etymology: 1735–45 …   From formal English to slang

  • Zygomatic process of frontal bone — Infobox Bone Name = Zygomatic process of frontal bone Latin = processus zygomaticus ossis frontalis GraySubject = 33 GrayPage = 136 Caption = Left zygomatic bone. (Zygomatic process of frontal bone is the part of the frontal bone (upper part of… …   Wikipedia


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