Tibioastragalus anticus of Gruber muscle
Last revised by Joachim Feger ◉ on 28 Dec 2021
Citation, DOI, disclosures and article data
Citation:
Feger J, Bell D, Tibioastragalus anticus of Gruber muscle. Reference article, Radiopaedia.org (Accessed on 30 Sep 2023) https://doi.org/10.53347/rID-90923
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rID:
90923
Article created:
4 Jul 2021, Joachim Feger ◉
Disclosures:
At the time the article was created Joachim Feger had no recorded disclosures.
View Joachim Feger's current disclosuresLast revised:
28 Dec 2021, Joachim Feger ◉
Disclosures:
At the time the article was last revised Joachim Feger had no recorded disclosures.
View Joachim Feger's current disclosuresRevisions:
6 times, by 2 contributors - see full revision history and disclosures
Systems:
Sections:
Synonyms:
- Tibioastragalus anticus of Gruber (TAAG) muscle
- Anterior tibiotalus muscle
The tibioastragalus anticus of Gruber (TAAG) muscle or anterior tibiotalus muscle is a rare accessory muscle of the ankle and an anatomical variant.
On this page:
Summary
- origin: lateral tibial surface and the interosseous membrane of the distal third of the lower leg
-
insertion: anterior superolateral neck of the talus
- variable insertions to the navicular bone and talonavicular joint
Gross anatomy
The tibioastragalus anticus of Gruber originates from the lower third of the tibia and deep to the tibialis anterior tendon and courses posteriorly to the extensor digitorum and extensor hallucis longus tendons at the level of the inferior extensor retinaculum from medial to lateral. It inserts in a fan-like fashion onto the neck of the talus 1,2.
History and etymology
The tibioastragalus anticus of Gruber muscle was first described by the Russian anatomist Wenzel Gruber in 1871 after cadaveric dissection of three cases. The muscle was again described later in 1927 by the American anatomist Henry K Seelaus 2-5.
Clinical importance
The tibioastragalus anticus of Gruber muscle might be mistaken for a pathological condition or might potentially serve as a harvest site for a tendon graft 1,2.
References
- 1. Aparisi Gómez M, Aparisi F, Bartoloni A et al. Anatomical Variation in the Ankle and Foot: From Incidental Finding to Inductor of Pathology. Part I: Ankle and Hindfoot. Insights Imaging. 2019;10(1):74. doi:10.1186/s13244-019-0746-2 - Pubmed
- 2. Berkowitz Y, Mushtaq N, Amiras D. MRI of the Tibioastragalus Anticus of Gruber Muscle: A Rare Accessory Muscle and Normal Anatomical Variant. Skeletal Radiol. 2016;45(6):847-9. doi:10.1007/s00256-016-2370-2 - Pubmed
- 3. R. Shane Tubbs, Mohammadali M. Shoja, Marios Loukas. Bergman's Comprehensive Encyclopedia of Human Anatomic Variation. (2016) ISBN: 9781118430354 - Google Books
- 4. Gruber W. Über einen Musculus tibio-astragaleus anticus des Menschen. Arch Anat Physiol Wissen Med 1871;1871:663–93.
- 5. Seelaus HK. On certain muscle anomalies of the lower extremity. Anat Rec. 1927;35:187.
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