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Encyclopedia > Pterion
Side view of head, showing surface relations of bones. (Pterion labeled at center.)
Side view of the skull. (Pterion visible but not labeled.)
Latin '
Gray's subject #46 182
MeSH [1]
Dorlands/Elsevier p_41/12678391

The point corresponding with the posterior end of the sphenoparietal suture is named the pterion; it is situated about 3 cm. behind, and a little above the level of the zygomatic process of the frontal bone. Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... Embryology is the branch of developmental biology that studies embryos and their development. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo Elsevier, the worlds largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. ... The frontal bone (os frontale, TA: A02. ...

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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 As such, some of the information contained herein may be outdated.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. SUNY Downstate Medical Center is Brooklyns only academic medical center. ... The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...

Cranial bones - edit

occipital bone: Foramen magnum | Squama occipitalis | Inion | Nuchal lines | Planum occipitale | Planum nuchale | Internal occipital protuberance | Sagittal sulcus | Internal occipital crest | Lateral parts of occipital bone | Hypoglossal canal | Condyloid fossa | Condyloid canal | Jugular process | Jugular tubercle | Basilar part of occipital bone | Pharyngeal tubercle A hippopotamus skull A skull, or cranium, is a bony structure of Craniates which serves as the general framework for a head. ... The occipital bone [Fig. ... In anatomy, the foramen magum is the large hole through the occipital bone in the base of the skull, through which the medulla oblongata (an extension of the spinal cord) exits the skull vault. ... The inion is the most prominent projection of the occipital bone at the lower rear part of the skull. ... The hypoglossal canal is a bony canal in the occipital bone of the skull that transmits the hypoglossal nerve from its point of entry near the medulla oblongata to its exit from the base of the skull near the jugular foramen. ...

parietal bone: Parietal eminence | Temporal line | Parietal foramen The parietal bones (os parietale) are bones in the human skull and form, by their union, the sides and roof of the cranium. ...

frontal bone: Squama frontalis | Frontal suture | Frontal eminence | Superciliary arches | Glabella | Supraorbital foramen | Zygomatic process | Sagittal sulcus | Frontal crest | Foramen cecum | Pars orbitalis | Frontal sinus | Frontonasal duct The frontal bone (os frontale, TA: A02. ... The frontal suture (sutura frontalis) is a dense connective tissue structure that divides the two halves of the frontal bone of the skull in infants and children. ... The glabella is the space between the eyebrows and above the nose. ... ...

temporal bone: Squama temporalis | Articular tubercle | Suprameatal triangle | Mandibular fossa | Petrotympanic fissure | Mastoid portion | Mastoid foramen | Mastoid process | Mastoid notch | Occipital groove | Sigmoid sulcus | Mastoid antrum | Petrous portion | Hiatus of the facial canal | Internal auditory meatus | Subarcuate fossa | Carotid canal | Aqueduct of cochlea | Jugular fossa | Inferior tympanic canaliculus | Mastoid canaliculus | Styloid process | Stylomastoid foramen | Jugular foramen | Petrosquamous suture | Suprameatal spine | The temporal bones (os temporales) are situated at the sides and base of the skull. ... The mastoid process (or mastoid bone) is a conical bump of the posterior portion of the temporal bone that is situated behind the ear in humans and many other vertebrates and serves as a site of neck muscle attachment (the Sternocleidomastoid, Splenius capitis, and Longissimus capitis). ... Between the styloid and mastoid processes is the stylomastoid foramen; it is the termination of the facial canal, and transmits the facial nerve and stylomastoid artery. ... Behind the carotid canal is the jugular foramen, a large aperture, formed in front by the petrous portion of the temporal, and behind by the occipital; it is generally larger on the right than on the left side, and may be subdivided into three compartments. ...

sphenoid bone: Sphenoidal sinuses | Ethmoidal spine | Optic foramen | Sella turcica | Fossa hypophyseos | Dorsum sellae | Posterior clinoid processes | Carotid groove | Lingula sphenoidalis | Sphenoidal conchæ | Great wings of the sphenoid | Spina angularis | Foramen rotundum | Foramen ovale | Foramen Vesalii | Foramen spinosum | Infratemporal crest | Sulcus tubae auditivae | Small wings of the sphenoid | Superior orbital fissure | Anterior clinoid process | Optic foramen | Pterygoid processes of the sphenoid | Pterygoid fossa | Scaphoid fossa | Lateral pterygoid plate | Medial pterygoid plate | Pterygoid hamulus | Sphenoidal conchæ | Sphenoidal sinuses Figure 1 : Sphenoid bone, upper surface. ... The Sella turcica (literally Turkish saddle) is a saddle-shaped depression in the sphenoid bone at the base of the human skull. ... At th anterior and medial part of the Sphenoid is a circular aperture, the foramen rotundum, for the transmission of the maxillary nerve. ... At the base of the skull the foramen ovale is a hole that transmits the mandibular nerve, the otic ganglion, the accessory meningeal artery, emissary veins (from the cavernous sinus to the pterygoid plexus) and the lesser superficial petrosal nerve. ... The foramen spinosum is the foramen in the skull that permits the passage of the middle meningeal artery. ... The superior orbital fissure is a foramen in the skull, although strictly it is more of a cleft, lying between the lesser and greater wings of the sphenoid bone. ... The Pterygoid fossa, or the sphenoid bone is wedged between several other bones in the front of the cranium. ... The medial pterygoid plate of the sphenoid is narrower and longer than the lateral pterygoid plate; it curves lateralward at its lower extremity into a hook-like process, the pterygoid hamulus, around which the tendon of the Tensor veli palatini glides. ...

ethmoid bone: Cribriform plate | Crista galli | Perpendicular plate | Labyrinth of ethmoid | Ethmoid sinus | Uncinate process | Middle nasal concha | Superior meatus | Superior nasal concha | Middle meatus Your skull is in your back (this is obviously not true, I was just testing the website to see if it really works) The ethmoid bone (os ethmoidale) is a bone in the skull that separates the nasal cavity from the brain. ... The ethmoid bone (os ethmoidale) is a bone in the skull that separates the nasal cavity from the brain. ... The crista galli (Latin: crest of the cock) is a median ridge of bone that projects from the cribriform plate of the ethmoid bone. ... ethmoidal sinuses can be divided into 3: a) anterior b) middle c) posterior except the posterior ethmoidal sinus, all the ethmoidal sinuses will drain into middle meateus. ... An uncinate process is a hook shaped process on the lateral borders of the superior surface of the bodies of C3-C6 (T1). ...

Facial bones

maxilla: Incisive fossa | Maxillary sinus | Incisive fossa | Canine fossa | Infraorbital foramen | Anterior nasal spine | Alveolar canals | Orbitofrontal cortex | Infraorbital canal | Pterygopalatine canal | Zygomatic process | Agger nasi | Anterior lacrimal crest | Alveolar process | Incisive foramen | Incisive canals | Foramina of Scarpa | Premaxilla | Anterior nasal spine A hippopotamus skull A skull, or cranium, is a bony structure of Craniates which serves as the general framework for a head. ... The maxillae are the largest bones of the face, except for the mandible, and form, by their union, the whole of the upper jaw. ... The maxillary sinus is the largest paranasal sinus. ... The orbitofrontal cortex is a region of association cortex the human brain involved in cognitive processes such as decision making. ... The alveolar process (processus alveolaris), also referred to as the alveolar bone, is the bone found in the jaws of a mouth containing the socket of teeth. ... The premaxilla is a pair of small bones at the very tip of the jaws of many animals, usually bearing teeth, but not always. ...

lacrimal bone: Posterior lacrimal crest The lacrimal bone (Os Lacrimale), the smallest and most fragile bone of the face, is situated at the front part of the medial wall of the orbit . ...

zygomatic bone: Zygomaticofacial foramen | Zygomaticotemporal foramen | Zygomaticoörbital foramina The zygomatic bone (also known as the zygoma; Os Zygomaticum; Malar Bone) is a paired bone of the human skull. ...

palatine bone: Pterygopalatine fossa | Pterygoid fossa | Horizontal plate of palatine bone | Posterior nasal spine | Perpendicular plate of palatine bone | Pterygopalatine canal | Sphenopalatine foramen | Pyramidal process of palatine bone | Orbital process of palatine bone | Sphenoidal process of palatine bone The palatine bone is a bone situated at the back part of the nasal cavity between the maxilla and the pterygoid process of the sphenoid. ... In the skull, the pterygopalatine fossa is the space between the lateral pterygoid plate (which is part of the sphenoid bone), and the palate. ... The Pterygoid fossa, or the sphenoid bone is wedged between several other bones in the front of the cranium. ...

mandible: Symphysis menti | Mental foramen | Mylohyoid line | Ramus mandibulae | Mandibular foramen | Mandibular canal The mandible (inferior maxillary bone) (together with the maxilla) is the largest and strongest bone of the face. ... The external surface of the mandible is marked in the median line by a faint ridge, indicating the Symphysis menti or line of junction of the two pieces of which the bone is composed at an early period of life. ... The mental foramen is a foramen in the mandible. ... The Mandibular Foramen is an opening on the internal surface of the ramus for the mandibular vessels and nerve to pass. ...

others: nasal bone | inferior nasal conchae | vomer bone The Nasal Bones (Ossa Faciei & Ossa Nasalia) are two small oblong bones, varying in size and form in different individuals; they are placed side by side at the middle and upper part of the face, and form, by their junction, the bridge of the nose. ... It has been suggested that this article or section be merged with Nasal concha. ... The vomer bone is one of the unpaired facial bones of the skull. ...

composite structures

Cranial sutures: Coronal suture | Lambdoidal suture | Occipitomastoid suture | Parietomastoid suture | Sphenofrontal suture | Sphenoparietal suture |Sphenosquamosal suture | Sphenozygomatic suture |Squamosal suture | Zygomaticotemporal suture | Zygomaticofrontal suture | Frontal suture / Metopic suture | Sagittal suture | Frontoethmoidal suture | Petrosquamous suture | Sphenoethmoidal suture | Sphenopetrosal suture The coronal suture (sutura coronalis) is a dense, fibrous connective tissue joint that separates the frontal and parietal bones of the skull. ... The squamosal suture arches backward from the pterion and connects the temporal squama with the lower border of the parietal: this suture is continuous behind with the short, nearly horizontal parietomastoid suture, which unites the mastoid process of the temporal with the region of the mastoid angle of the parietal. ... The frontal suture (sutura frontalis) is a dense connective tissue structure that divides the two halves of the frontal bone of the skull in infants and children. ... The sagittal suture (sutura sagittalis) is a dense, fibrous connective tissue joint between the two parietal bones of the skull. ...

Asterion | Nasion | Pterion | Inferior orbital fissure The nasion is the intersection of the frontal and two nasal bones of the human skull. ...

  Results from FactBites:
Pterion - Wikipedia, the free encyclopedia (226 words)
It marks the junction between three bones, the sphenoid bone, the parietal bone and the temporal bone.
Clinically, the pterion is relevant because the middle meningeal artery runs beneath it, on the inner side of the skull, which is quite thin at this point.
In Greek mythology, Hermes, messenger of the Gods, was enabled to fly by winged sandals, and wings on his head, which were attached at the pterion.
Cerebral Topography (442 words)
The line drawn from the inferior rim of the orbit through the external acoustic meatus (EAM) is called the Reid's base line and is very useful in estimating the location of the motor strip.
Pterion:: 2 fingerbreadths above the zygomatic arch and a thumb's breadth behind the frontal process of the zygomatic bone.
Planning temporal craniotomies or trephination; the position of the pterion, sylvian fissure and asterion is important to remember- the pterion and sylvian fissure are discussed above; the asterion is defined at the junction of the lambdoid, occipitomastoid and parietomastoid sutures.
  More results at FactBites »



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