Squamous part of frontal bone

Squama frontalis

  • Related terms: Squamous part

Definition

The frontal bone, shaped like a shell, consists of squamous and orbital parts. The squamous part of frontal bone is vertically oriented part makes up the forehead.

On its outer surface, it has several key anatomical features, including two noticeable superciliary arches located just above the superior orbital rim. These are separated by a smooth mid-line bony ridge called the glabella, situated right above the nasal bridge. A bit higher than the superciliary arches, on both sides, there are two noticeable bumps known as frontal eminences.

From a side view, the squamous part of frontal bone stretches into the temporal fossa, creating the temporal surface of the frontal bone. Here, it connects with three other bones–the parietal, sphenoid, and temporal–to form an area known as the pterion. Inner to this area, some crucial vessels, like the middle meningeal artery, lie. These can be torn in a temporal fracture, which may lead to an epidural hematoma.

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Text written by Muhammad A. Javaid, MD, PhD © 2024 IMAIOS.

  • Singh O, Varacallo M. Anatomy, Head and Neck: Frontal Bone. [Updated 2023 Jul 24]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK535424/

  • Drake, R.L., Vogl, A.W. and Mitchell, A.W.M. (2009). ‘Chapter 8: Head and Neck’ in Gray’s anatomy for Students. (2nd ed.) Philadelphia PA 19103-2899: Elsevier, pp.812-813.

  • Drake, R.L., Vogl, A.W. and Mitchell, A.W.M. (2009). ‘Chapter 8: Head and Neck’ in Gray’s anatomy for Students. (2nd ed.) Philadelphia PA 19103-2899: Elsevier, pp.920-921.


Comparative anatomy in animals

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