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Information about Zygomatic Arch

Side view of the skull.
Articulation of the mandible. Lateral aspect.
Latinarcus zygomaticus
subject #46 183
Dorlands/Elsevier a_58/12150836
The zygomatic arch is formed by the zygomatic process of temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomatic (the side of the cheekbone), the two being united by an oblique suture; the tendon of the Temporalis passes medial to the arch to gain insertion into the coronoid process of the mandible.

The zygomatic process of the temporal arises by two roots:
  • an anterior, directed inward in front of the mandibular fossa, where it expands to form the articular tubercle.
  • a posterior, which runs backward above the external acoustic meatus and is continuous with the supramastoid crest.
The upper border of the arch gives attachment to the temporal fascia; the lower border and medial surface give origin to the Masseter.

Additional images


Left temporal bone. Outer surface.

Left zygomatic bone. Malar surface.

Base of skull. Inferior surface.

The Temporalis; the zygomatic arch and Masseter have been removed.

Dissection, showing salivary glands of right side.


External links

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 As such, some of the information contained herein may be outdated.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.

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Bones of head and neck: cranial sutures, fontanelles, and related regions
Cranial suturesCoronal - Lambdoid - Occipitomastoid - Sphenofrontal - Sphenoparietal - Sphenosquamosal - Sphenozygomatic -Squamosal - Zygomaticotemporal - Zygomaticofrontal - Frontal/Metopic - Sagittal - Frontoethmoidal - Petrosquamous - Sphenoethmoidal - Sphenopetrosal
FontanellesAnterior fontanelle - Posterior fontanelle
Foramina of multiple bonesInferior orbital fissure - Foramen lacerum - Jugular foramen - Nasolacrimal canal
FossaeAnterior cranial fossa - Middle cranial fossa - Posterior cranial fossa - Cranial cavity
Other compound structuresAsterion - Nasion - Pterion - Dacryon - Zygomatic arch - Calvaria - Temporal fossa - Infratemporal fossa - Stephanion - Pterygomaxillary fissure - Pterygopalatine fossa
Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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The zygomatic process of the temporal bone is a long, arched process projecting from the lower part of the squamous portion of the temporal bone. It articulates with the zygomatic bone.
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Zygomatic (from Greek zygoma, "yoke") can refer to:
  • Zygomatic bone
  • Zygomaticus major muscle

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The temporalis muscle is one of the muscles of mastication.

Structure

It arises from the temporal fossa and the deep part of temporal fascia. It passes medial to the zygomatic arch and inserts onto the coronoid process of the mandible.
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The Coronoid process (from Greek korone, "like a crow's beak") can refer to:
  • The coronoid process of the mandible, part of the ramus mandibulae of the mandible
  • The coronoid process of the ulna

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mandible (from Latin mandibūla, "jawbone") or inferior maxillary bone is, together with the maxilla, the largest and strongest bone of the face . It forms the lower jaw and holds the lower teeth in place.
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In the temporal bone, the mandibular fossa (glenoid fossa) is bounded, in front, by the articular tubercle; behind, by the tympanic part of the bone, which separates it from the external acoustic meatus; it is divided into two parts by a narrow slit, the petrotympanic
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The ear canal (external auditory meatus, external acoustic meatus), is a tube running from the outer ear to the middle ear. The ear canal extends from the pinna to the eardrum and is about 26 mm in length and 7 mm in diameter.
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The temporal fascia covers the Temporalis muscle.

It is a strong, fibrous investment, covered, laterally, by the Auricularis anterior and superior, by the galea aponeurotica, and by part of the Orbicularis oculi.
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In human anatomy, the masseter is one of the muscles of mastication.

It is particularly powerful in herbivores to assist when they are chewing plants.

Origin and insertion of the two heads


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eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely, two medical doctors. It was sold to WebMD in January 2006.
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Georgetown University is a private, Jesuit, research university, located in Washington, D.C.'s Georgetown neighborhood. Father John Carroll founded the school in 1789, though its roots extend back to 1634.
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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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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Bones are rigid organs that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red and white blood cells and store minerals.
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Head and neck anatomy focuses on the structures of the head and neck of the human body, including the brain, bones, muscles, blood vessels, nerves, glands, nose, mouth, teeth, tongue, and throat.
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Cranial sutures are the joints between the bones of the skull (or "cranium"), bound together by Sharpey's fibres. A tiny amount of movement is permitted at sutures, which contributes to the compliance and elasticity of the skull.
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fontanelle (or fontanel) is one of two "soft spots" on a newborn human's skull. There are, however, two more fontanelles of interest, the mastoid fontanelle, and the sphenoidal fontanelle.
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Cranial sutures are the joints between the bones of the skull (or "cranium"), bound together by Sharpey's fibres. A tiny amount of movement is permitted at sutures, which contributes to the compliance and elasticity of the skull.
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The coronal suture is a dense, fibrous connective tissue joint that separates the frontal and parietal bones of the skull. At birth, the bones of the skull do not meet.

Pathology

If certain bones of the skull grow too fast then "premature closure" of the sutures may occur.
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The lambdoid suture (or Lambdoidal suture) is a dense, fibrous connective tissue joint that separates the parietal and temporal bones of the skull from the occipital bone.

Its name comes from the lambda-like shape this suture makes on the back of the skull.
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The occipitomastoid suture is the cranial suture between the occipital bone and the mastoid portion of the temporal bone.

It is continuous with the lambdoidal suture.
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The Sphenofrontal suture is the cranial suture between the sphenoid bone and the frontal bone.

Additional images



The skull from the front.

Base of the skull. Upper surface.

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The Sphenoparietal suture is the cranial suture between the sphenoid bone and the parietal bone.

External links

  • SIG at UWash Sphenoparietal%20suture
This article was originally based on an entry from a public domain edition of Gray's Anatomy.
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The Sphenosquamosal suture is a cranial suture between the sphenoid bone and the squama of the temporal bone.

Additional images



Base of the skull. Upper surface.

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The Sphenozygomatic suture is the cranial suture between the sphenoid bone and the zygomatic bone.

Additional images



The skull from the front.

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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
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The Zygomaticotemporal suture (or Temporozygomatic suture) is the cranial suture between the zygomatic bone and the temporal bone.

External links

  • SIG at UWash Temporozygomatic%20suture
  • Roche Lexicon - illustrated navigator, at Elsevier

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