Ontogenetic scaling of foot musculoskeletal anatomy in elephants

C. E. Miller*, C. Basu, G. Fritsch, T. Hildebrandt, J. R. Hutchinson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

35 Citations (Scopus)

Abstract

This study quantifies the shape change in elephant manus and pes anatomy with increasing body mass, using computed tomographic scanning. Most manus and pes bones, and manus tendons, maintain their shape, or become more gracile, through ontogeny. Contrary to this, tendons of the pes become significantly more robust, suggesting functional adaptation to increasingly high loads. Ankle tendon cross-sectional area (CSA) scales the highest in the long digital extensor, proportional to body mass1.08±0.21, significantly greater than the highest-scaling wrist tendon (extensor carpi ulnaris, body mass0.69±0.09). These patterns of shape change relate to the marked anatomical differences between the pillar-like manus and tripod-like pes, consistent with differences in fore- and hindlimb locomotor function. The cartilaginous predigits (prepollux and prehallux) of the manus and pes also become relatively more robust through ontogeny, and their pattern of shape change does not resemble that seen in any of the 10 metacarpals and metatarsals. Their CSAs scale above isometry proportional to body mass 0.73±0.09 and body mass0.82±0.07 respectively. We infer a supportive function for these structures, preventing collapse of the foot pad during locomotion.

Original languageEnglish
Pages (from-to)465-475
Number of pages11
JournalJournal of the Royal Society Interface
Volume5
Issue number21
DOIs
Publication statusPublished - 6 Apr 2008

Keywords

  • Computed tomography
  • Digits
  • Elephants
  • Feet
  • Functional anatomy
  • Scaling

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