Parasphenoid: Difference between revisions

General Information
Latin	os parasphenoidale
Greek
TA98
TA2
FMA
Details
System	Skeletal system
Artery
Vein
Nerve
Lymphatic drainage
Precursor	Neural crest
Function
Identifiers
Clinical significance
Notes

Latest revision as of 20:42, 30 December 2024

Bone in the skull of vertebrates

The parasphenoid is a bone found in the skull of many vertebrates. It is typically located on the ventral side of the skull and is part of the neurocranium. The parasphenoid bone is an important structure in the anatomy of fishes, amphibians, and some reptiles.

Structure[edit]

The parasphenoid is a median bone that lies beneath the braincase. It often extends from the region of the sphenoid bone to the occipital bone. In many species, it provides support for the brain and serves as an attachment point for various muscles.

Development[edit]

The parasphenoid bone develops from the neural crest cells during embryogenesis. It is one of the first bones to ossify in the developing skull of many vertebrates.

Function[edit]

The primary function of the parasphenoid is to provide structural support to the skull. It also plays a role in the protection of the brain and the sensory organs housed within the skull.

Evolutionary significance[edit]

The presence and structure of the parasphenoid bone can vary significantly among different vertebrate groups, reflecting its evolutionary adaptations. In bony fish and amphibians, the parasphenoid is often well-developed, whereas in mammals, it is typically reduced or absent.

References[edit]

External links[edit]

Parasphenoid on WikiMD

@@ Line 1: / Line 1: @@
-== Parasphenoid ==
-The '''Parasphenoid''' is a bone found in the skulls of many [[vertebrate]]s, and is considered part of the [[cranial skeleton]]. It is located on the ventral side of the skull, between the [[basal plate]] and the [[palate]]. The parasphenoid plays a crucial role in the structural support of the skull and is involved in the formation of the [[braincase]].
+{{Short description|Bone in the skull of vertebrates}}
+{{Infobox bone
+| Name = Parasphenoid
+| Latin = os parasphenoidale
+| Image = <!-- Image removed -->
+| Caption = <!-- Caption removed -->
+| Precursor = [[Neural crest]]
+| System = [[Skeletal system]]
+| Partof = [[Skull]]
+| MeshName = Parasphenoid
+}}
-[[File:Parasphenoid bone in fish skull.png|thumb|right|300px|Parasphenoid bone in a fish skull]]
+The '''parasphenoid''' is a bone found in the [[skull]] of many [[vertebrates]]. It is typically located on the ventral side of the skull and is part of the [[neurocranium]]. The parasphenoid bone is an important structure in the [[anatomy]] of [[fishes]], [[amphibians]], and some [[reptiles]].
-== Structure ==
+==Structure==
+The parasphenoid is a median bone that lies beneath the [[braincase]]. It often extends from the region of the [[sphenoid bone]] to the [[occipital bone]]. In many species, it provides support for the [[brain]] and serves as an attachment point for various [[muscles]].
-The parasphenoid is a single, unpaired bone that is typically elongated and flat. It is often fused with the [[basisphenoid bone]] in mammals, forming the [[sphenoid bone]]. In many [[fish]] and [[amphibian]] species, the parasphenoid extends towards the rear of the skull, forming a 'spike' known as the parasphenoid rostrum.
+==Development==
+The parasphenoid bone develops from the [[neural crest]] cells during [[embryogenesis]]. It is one of the first bones to ossify in the developing skull of many vertebrates.
-== Function ==
+==Function==
+The primary function of the parasphenoid is to provide structural support to the skull. It also plays a role in the protection of the [[brain]] and the [[sensory organs]] housed within the skull.
-The parasphenoid provides structural support to the skull and contributes to the formation of the braincase. It also forms part of the roof of the mouth in many species, contributing to the structure of the palate.
+==Evolutionary significance==
+The presence and structure of the parasphenoid bone can vary significantly among different vertebrate groups, reflecting its evolutionary adaptations. In [[bony fish]] and [[amphibians]], the parasphenoid is often well-developed, whereas in [[mammals]], it is typically reduced or absent.
-== Evolution ==
+==See also==
-The parasphenoid is thought to have evolved from the ventral part of the ancestral vertebrate's [[chondrocranium]], which was originally composed of cartilage. Over time, this cartilage became ossified, forming the parasphenoid bone.
-== Clinical significance ==
-In humans, the parasphenoid is often fused with the basisphenoid bone to form the sphenoid bone. Abnormalities in the development of these bones can lead to conditions such as [[Crouzon syndrome]] and [[Apert syndrome]], which are characterized by craniofacial deformities.
-== See also ==
 * [[Sphenoid bone]]
-* [[Cranial bones]]
+* [[Neurocranium]]
-* [[Chondrocranium]]
+* [[Vertebrate anatomy]]
-== References ==
-<references />
+==References==
+{{Reflist}}
-{{anatomy-stub}}
+==External links==
+* [https://www.wikimd.com/wiki/Parasphenoid Parasphenoid on WikiMD]
 [[Category:Vertebrate anatomy]]
 [[Category:Skull]]
-[[Category:Bones of the head and neck]]
+[[Category:Skeletal system]]