Mastoid part of temporal bone

The mastoid part of the temporal bone is its posterior component.

Gross anatomy

The mastoid part is normally pneumatised by the mastoid air cells and is perforated by the the mastoid foramen

The mastoid part has an outer rough surface that provides attachment to occipitalis and auricularis posterior muscles. It continues inferiorly as the mastoid process, which is a conical bony projection that provides attachment for a number of muscles:

On the medial aspect of the mastoid process is a deep groove, called the digastric fossa, where the digastric muscles attach. Medial to this is the occipital groove, which is traversed by the occipital artery. The sigmoid sulcus, which lodges part of the transverse sinus, lies in the inner surface of the mastoid portion.


Mastoid part of temporal bone articulates with following bones 

  • the superior borders articulates with the mastoid angle of the parietal bone
  • the posterior border articulates with the inferior border of the occipital bone
  • anteriorly it is fused with the descending process of the squamous temporal bone

Head and neck anatomy
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Article Information

rID: 28368
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Mastoid part
  • Mastoid temporal bone
  • Mastoid part of the temporal bone
  • Mastoid portion of the temporal bone
  • Pars mastoidea

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