Online first
Case report
Published online: 2024-04-24

open access

Page views 90
Article views/downloads 53
Get Citation

Connect on Social Media

Connect on Social Media

Pterygoideus proprius muscle: stuck between the greater wing and lateral pterygoid plate

Claire E. Stoudemire1, Brittney L. Link1, Faith M. Klein1, Caitlin N. Sachsenmeier1, Randy J. Kulesza1
Pubmed: 38757501

Abstract

The muscles of mastication derive from a common embryological source, and the presence of accessory muscles in the infratemporal fossa (ITF) is uncommon. Here, we present findings from postmortem dissection of the ITF revealing a unilaterally present muscle extending from the greater wing of the sphenoid to blend inferiorly with the medial and lateral pterygoid muscles before attaching to the lateral pterygoid plate. This muscle is most consistent with the pterygoideus proprius muscle initially described in 1858. Though the exact embryological origin and function of this muscle remain speculative, these topics are nonetheless worth investigating as it may provide insight regarding the ontogeny of muscles descending from the first pharyngeal arch. Additionally, presence of the pterygoideus proprius muscle may have clinical implications and impact surrounding structures such as the mandibular division of the trigeminal nerve, maxillary artery, pterygoid venous plexus, masticatory muscles, and temporomandibular joint (TMJ).

Article available in PDF format

View PDF Download PDF file

References

  1. Akita K, Shimokawa T, Sato T. Aberrant muscle between the temporalis and the lateral pterygoid muscles: M. pterygoideus proprius (Henle). Clin Anat. 2001; 14(4): 288–291.
  2. Barker BC. The pterygoideus proprius muscle. Aust Dent J. 1981; 26(5): 309–310.
  3. Bergman RA, Tubbs RS, Shoja MM. et al.. Facial muscles and muscles of mastication. In 's comprehensive encyclopedia of human anatomic variation (1st ed., pgs. 224-225). In: Tubbs RS, Shoja MM, Loukas M. ed. Bergman's comprehensive encyclopedia of human anatomic variation. John Wiley et Sons, Inc., Hoboken 2016.
  4. Henle J. Handbuch der systematischen Anatomie des Menschen. Friedrich Vieweg und Sohn, Braunschweig 1858: 161–164.
  5. Liu F, Steinkeler A. Epidemiology, diagnosis, and treatment of temporomandibular disorders. Dent Clin North Am. 2013; 57(3): 465–479.
  6. Penhall B, Townsend G, Tomo S, et al. The pterygoideus propius muscle revisited. Clin Anat. 1998; 11(5): 332–337, doi: 10.1002/(SICI)1098-2353(1998)11:5<332::AID-CA7>3.0.CO;2-R.
  7. Snoeck T, Provyn S, Balestra C, et al. The musculus pterygoïdeus proprius: an in-vivo approach with magnetic resonance imaging. J Anat. 2010; 217(6): 679–682.
  8. Tubbs R, Stetler W, Shoja M, et al. An unusual muscular variation of the infratemporal fossa. Folia Morphol. 2007; 66(3): 200–202.
  9. Valesan LF, Da-Cas CD, Réus JC, et al. Prevalence of temporomandibular joint disorders: a systematic review and meta-analysis. Clin Oral Investig. 2021; 25(2): 441–453.
  10. Yu SK, Kim TH, Yang KY, et al. Morphology of the temporalis muscle focusing on the tendinous attachment onto the coronoid process. Anat Cell Biol. 2021; 54(3): 308–314.