Zygomatic arch
Side view of the skull.
Articulation of the mandible. Lateral aspect.
Latin	arcus zygomaticus
Gray's	subject #46 183

The zygomatic arch or cheek bone 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 bone (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 term zygomatic derives from the Latin zyosislymore meaning malar bone or cheekbone. The zygomatic arch is occasionally referred to as the zygoma, but this term usually refers to the zygomatic bone or occasionally the zygomatic process.

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.

The zygomatic arch is significant in evolutionary biology, as it is part of the structures derived from the ancestral single temporal fenestra of the synapsid ancestor of mammals.

[edit] 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.

[edit] External links

• Zygomatic+arch at eMedicine Dictionary
• lesson1 at The Anatomy Lesson by Wesley Norman (Georgetown University) (latskullitems)
• Roche Lexicon - illustrated navigator, at Elsevier 34257.000-1
• Diagram at unc.edu

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 As such, some of the information contained within it may be outdated.

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v • d • e Bones of head and neck: compound structures of skull (TA A02.1.00.002-052, GA 2.178-199) Neurocranium Calvaria (Diploë) Asterion · Pterion · Stephanion · Bregma · Lambda Fossae: anterior cranial fossa · middle cranial fossa · posterior cranial fossa · cranial cavity Base of skull Fontanelles: anterior · posterior · sphenoidal · mastoid Facial skeleton Nasion · Gonion Both dacryon · zygomatic arch · temporal fossa · infratemporal fossa · pterygomaxillary fissure · pterygopalatine fossa Orbit: Foramina (inferior orbital fissure)