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Comparative anatomy and functional implications of variation in the buccal mass in coleoid cephalopods

Marjorie Roscian, Louise Souquet, Anthony Herrel (UGent) , Theodore Uyeno, Dominique Adriaens (UGent) , Barbara De Kegel (UGent) and Isabelle Rouget
(2023) JOURNAL OF MORPHOLOGY. 284(6).
Author
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Abstract
In contrast to the well-studied articulated vertebrate jaws, the structure and function of cephalopod jaws remains poorly known. Cephalopod jaws are unique as the two jaw elements do not contact one another, are embedded in a muscular mass and connected through a muscle joint. Previous studies have described the anatomy of the buccal mass muscles in cephalopods and have proposed variation in muscle volume depending on beak shape. However, the general structure of the muscles has been suggested to be similar in octopuses, squids, and cuttlefish. Here we provide a quantitative analysis of the variation in the buccal mass of coleoids using traditional dissections, histological sections and contrast-enhanced computed tomography scans. Our results show that the buccal mass is composed of four main homologous muscles present in both decapodiforms and octopodiforms as suggested previously. However, we also report the presence of a muscle uniquely present in octopodiforms (the postero-lateral mandibular muscle). Our three dimensional reconstructions and quantitative analyses of the buccal mass muscles pave the way for future functional analyses allowing to better model jaw closing in coleoids. Finally, our results suggest differences in beak and muscle function that need to be validated using future in vivo functional analyses.
Keywords
Developmental Biology, Animal Science and Zoology, cephalopod beak, CT scan, decapodiforms, dissection, muscle, octopodiforms, MUSCLE ARTICULATION, OCTOPUS-VULGARIS, MORPHOLOGY, RADULA, TEETH, JOINT

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MLA
Roscian, Marjorie, et al. “Comparative Anatomy and Functional Implications of Variation in the Buccal Mass in Coleoid Cephalopods.” JOURNAL OF MORPHOLOGY, vol. 284, no. 6, 2023, doi:10.1002/jmor.21595.
APA
Roscian, M., Souquet, L., Herrel, A., Uyeno, T., Adriaens, D., De Kegel, B., & Rouget, I. (2023). Comparative anatomy and functional implications of variation in the buccal mass in coleoid cephalopods. JOURNAL OF MORPHOLOGY, 284(6). https://doi.org/10.1002/jmor.21595
Chicago author-date
Roscian, Marjorie, Louise Souquet, Anthony Herrel, Theodore Uyeno, Dominique Adriaens, Barbara De Kegel, and Isabelle Rouget. 2023. “Comparative Anatomy and Functional Implications of Variation in the Buccal Mass in Coleoid Cephalopods.” JOURNAL OF MORPHOLOGY 284 (6). https://doi.org/10.1002/jmor.21595.
Chicago author-date (all authors)
Roscian, Marjorie, Louise Souquet, Anthony Herrel, Theodore Uyeno, Dominique Adriaens, Barbara De Kegel, and Isabelle Rouget. 2023. “Comparative Anatomy and Functional Implications of Variation in the Buccal Mass in Coleoid Cephalopods.” JOURNAL OF MORPHOLOGY 284 (6). doi:10.1002/jmor.21595.
Vancouver
1.
Roscian M, Souquet L, Herrel A, Uyeno T, Adriaens D, De Kegel B, et al. Comparative anatomy and functional implications of variation in the buccal mass in coleoid cephalopods. JOURNAL OF MORPHOLOGY. 2023;284(6).
IEEE
[1]
M. Roscian et al., “Comparative anatomy and functional implications of variation in the buccal mass in coleoid cephalopods,” JOURNAL OF MORPHOLOGY, vol. 284, no. 6, 2023.
@article{01H0HYTJGKKD7MNNVXXEF3RHBH,
  abstract     = {{In contrast to the well-studied articulated vertebrate jaws, the structure and function of cephalopod jaws remains poorly known. Cephalopod jaws are unique as the two jaw elements do not contact one another, are embedded in a muscular mass and connected through a muscle joint. Previous studies have described the anatomy of the buccal mass muscles in cephalopods and have proposed variation in muscle volume depending on beak shape. However, the general structure of the muscles has been suggested to be similar in octopuses, squids, and cuttlefish. Here we provide a quantitative analysis of the variation in the buccal mass of coleoids using traditional dissections, histological sections and contrast-enhanced computed tomography scans. Our results show that the buccal mass is composed of four main homologous muscles present in both decapodiforms and octopodiforms as suggested previously. However, we also report the presence of a muscle uniquely present in octopodiforms (the postero-lateral mandibular muscle). Our three dimensional reconstructions and quantitative analyses of the buccal mass muscles pave the way for future functional analyses allowing to better model jaw closing in coleoids. Finally, our results suggest differences in beak and muscle function that need to be validated using future in vivo functional analyses.}},
  articleno    = {{e21595}},
  author       = {{Roscian, Marjorie and Souquet, Louise and Herrel, Anthony and Uyeno, Theodore and Adriaens, Dominique and De Kegel, Barbara and Rouget, Isabelle}},
  issn         = {{0362-2525}},
  journal      = {{JOURNAL OF MORPHOLOGY}},
  keywords     = {{Developmental Biology,Animal Science and Zoology,cephalopod beak,CT scan,decapodiforms,dissection,muscle,octopodiforms,MUSCLE ARTICULATION,OCTOPUS-VULGARIS,MORPHOLOGY,RADULA,TEETH,JOINT}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{14}},
  title        = {{Comparative anatomy and functional implications of variation in the buccal mass in coleoid cephalopods}},
  url          = {{http://doi.org/10.1002/jmor.21595}},
  volume       = {{284}},
  year         = {{2023}},
}
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