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Anatomical differences in the abdominal wall between animal species with implications for the transversus abdominis plane block: a systematic review

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Abstract

Purpose

With the increased use of simulation-based training using animal models for the education of surgical and anaesthetic techniques, an increased understanding of the anatomy of such models and how they compare to humans is required. The transversus abdominis plane block is a regional anaesthetic technique that requires an understanding of the abdominal wall anatomy along with proficient ultrasound use. The current review aims to compare the anatomy of the abdominal wall across species, particularly focussing on the pertinent differences within the class of mammals, and secondarily, it aims to address the implications of these differences for the use of simulation-based training of the transversus abdominis plane block.

Methods

To achieve this, the PubMed, Web of Science and Google Scholar databases were searched for relevant literature. Studies pertaining to the musculature, vasculature or innervation of the anterolateral abdominal wall across species were included.

Results

The mammalian abdominal wall differs in its musculature, vasculature or innervation from that of amphibians, birds or reptiles; however, among species of mammals, the structure of the abdominal wall follows a similar framework. Particular differences among mammals include the additional muscular layer of the panniculus carnosus found in most mammals other than humans, the variable arterial origins and dominant vascular supply of the abdominal wall and the number of thoracolumbar nerves innervating the abdominal wall.

Conclusion

When using animal models for simulation-based training, the pig is recommended for the transversus abdominis plane block given its closely homologous abdominal wall structure, availability and larger comparative size.

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JC Data collection or management, Initial literature searches, Protocol/project development, Manuscript writing/editing. DJH-S Protocol/project development. WMR Protocol/project development, Manuscript writing/editing.

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Correspondence to Jevan Cevik.

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This is a literature review that utilises information readily available from online databases. No ethics approval was required for the purposes of this study.

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Cevik, J., Hunter-Smith, D.J. & Rozen, W.M. Anatomical differences in the abdominal wall between animal species with implications for the transversus abdominis plane block: a systematic review. Surg Radiol Anat 44, 1171–1180 (2022). https://doi.org/10.1007/s00276-022-02991-y

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