The stability-mobility conflict in the primate thumb

Evie Vereecke, Marie Vanhoof, Szu-Ching Lu, Faes Kerkhof

Research output: Contribution to conferenceAbstract

Abstract

Primates use their thumb both in manipulation and locomotion leading to conflicting mechanical demands. High thumb mobility is required for manipulative skills while stability and strength are important in locomotion. In this study, we want to investigate how the anatomy of the primate thumb is adapted to this stability-mobility conflict. We focus on two highly dexterous catarrhines, the bonobo (Pan paniscus) and the olive baboon (Papio anubis), with a distinct locomotor, postural and prehensile behavior leading to a different thumb use and load. We obtained fresh-frozen cadaveric hand and forearm specimens via collaboration with the Royal Zoological Society of Antwerp (RZSA), Belgium (5 bonobos; Bonobo Morphology Initiative) and the CNRS, France (3 baboons). A detailed dissection was performed of each specimen with quantification of soft-tissue parameters (e.g. muscle mass and length, fascicle length, ligament dimensions). Each specimen was CT scanned and 3D surface models were created for the trapezium and first metacarpal (MC1) using Mimics software to assess the geometry of the trapeziometacarpal (TMC) joint. Bonobos and olive baboons have a fully opposable thumb, which is reflected in the well-developed thumb musculature. Bonobos have a saddle-shaped TMC joint allowing a wide range of motion, while the prominent volar beak and high joint curvature provide stability. In addition, five ligaments surround the TMC joint, acting as passive stabilizers. We believe that this anatomical configuration offers the required stability for forceful gripping during climbing and suspensory locomotion. Thumb loading is relatively low in baboons, being restricted to occasional climbing and palmigrady. Despite the cylindrical-shaped TMC joint, opposability is maintained by the relatively long length of the thumb. We want to thank Drs. Nauwelaerts, Stevens, Pereboom (RZSA), and Berillon (CNRS) for giving us access to the primate specimens.
Original languageEnglish
Publication statusPublished - 2016
EventThe 11th International Congress of Vertebrate Morphology - Washington, United States
Duration: 29 Jun 20163 Jul 2016

Conference

ConferenceThe 11th International Congress of Vertebrate Morphology
CountryUnited States
CityWashington
Period29/06/163/07/16

Fingerprint

Pan paniscus
Primates
Papio anubis
joints (animal)
Belgium
locomotion
Papio
ligaments
quantification
metacarpus
manipulation
saddles
beak
France
mathematics
hands
muscles
Society

Keywords

  • primate thumb
  • morphology
  • thumb mobility

Cite this

Vereecke, E., Vanhoof, M., Lu, S-C., & Kerkhof, F. (2016). The stability-mobility conflict in the primate thumb. Abstract from The 11th International Congress of Vertebrate Morphology, Washington, United States.
Vereecke, Evie ; Vanhoof, Marie ; Lu, Szu-Ching ; Kerkhof, Faes. / The stability-mobility conflict in the primate thumb. Abstract from The 11th International Congress of Vertebrate Morphology, Washington, United States.
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author = "Evie Vereecke and Marie Vanhoof and Szu-Ching Lu and Faes Kerkhof",
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Vereecke, E, Vanhoof, M, Lu, S-C & Kerkhof, F 2016, 'The stability-mobility conflict in the primate thumb' The 11th International Congress of Vertebrate Morphology, Washington, United States, 29/06/16 - 3/07/16, .

The stability-mobility conflict in the primate thumb. / Vereecke, Evie ; Vanhoof, Marie; Lu, Szu-Ching; Kerkhof, Faes.

2016. Abstract from The 11th International Congress of Vertebrate Morphology, Washington, United States.

Research output: Contribution to conferenceAbstract

TY - CONF

T1 - The stability-mobility conflict in the primate thumb

AU - Vereecke, Evie

AU - Vanhoof, Marie

AU - Lu, Szu-Ching

AU - Kerkhof, Faes

PY - 2016

Y1 - 2016

N2 - Primates use their thumb both in manipulation and locomotion leading to conflicting mechanical demands. High thumb mobility is required for manipulative skills while stability and strength are important in locomotion. In this study, we want to investigate how the anatomy of the primate thumb is adapted to this stability-mobility conflict. We focus on two highly dexterous catarrhines, the bonobo (Pan paniscus) and the olive baboon (Papio anubis), with a distinct locomotor, postural and prehensile behavior leading to a different thumb use and load. We obtained fresh-frozen cadaveric hand and forearm specimens via collaboration with the Royal Zoological Society of Antwerp (RZSA), Belgium (5 bonobos; Bonobo Morphology Initiative) and the CNRS, France (3 baboons). A detailed dissection was performed of each specimen with quantification of soft-tissue parameters (e.g. muscle mass and length, fascicle length, ligament dimensions). Each specimen was CT scanned and 3D surface models were created for the trapezium and first metacarpal (MC1) using Mimics software to assess the geometry of the trapeziometacarpal (TMC) joint. Bonobos and olive baboons have a fully opposable thumb, which is reflected in the well-developed thumb musculature. Bonobos have a saddle-shaped TMC joint allowing a wide range of motion, while the prominent volar beak and high joint curvature provide stability. In addition, five ligaments surround the TMC joint, acting as passive stabilizers. We believe that this anatomical configuration offers the required stability for forceful gripping during climbing and suspensory locomotion. Thumb loading is relatively low in baboons, being restricted to occasional climbing and palmigrady. Despite the cylindrical-shaped TMC joint, opposability is maintained by the relatively long length of the thumb. We want to thank Drs. Nauwelaerts, Stevens, Pereboom (RZSA), and Berillon (CNRS) for giving us access to the primate specimens.

AB - Primates use their thumb both in manipulation and locomotion leading to conflicting mechanical demands. High thumb mobility is required for manipulative skills while stability and strength are important in locomotion. In this study, we want to investigate how the anatomy of the primate thumb is adapted to this stability-mobility conflict. We focus on two highly dexterous catarrhines, the bonobo (Pan paniscus) and the olive baboon (Papio anubis), with a distinct locomotor, postural and prehensile behavior leading to a different thumb use and load. We obtained fresh-frozen cadaveric hand and forearm specimens via collaboration with the Royal Zoological Society of Antwerp (RZSA), Belgium (5 bonobos; Bonobo Morphology Initiative) and the CNRS, France (3 baboons). A detailed dissection was performed of each specimen with quantification of soft-tissue parameters (e.g. muscle mass and length, fascicle length, ligament dimensions). Each specimen was CT scanned and 3D surface models were created for the trapezium and first metacarpal (MC1) using Mimics software to assess the geometry of the trapeziometacarpal (TMC) joint. Bonobos and olive baboons have a fully opposable thumb, which is reflected in the well-developed thumb musculature. Bonobos have a saddle-shaped TMC joint allowing a wide range of motion, while the prominent volar beak and high joint curvature provide stability. In addition, five ligaments surround the TMC joint, acting as passive stabilizers. We believe that this anatomical configuration offers the required stability for forceful gripping during climbing and suspensory locomotion. Thumb loading is relatively low in baboons, being restricted to occasional climbing and palmigrady. Despite the cylindrical-shaped TMC joint, opposability is maintained by the relatively long length of the thumb. We want to thank Drs. Nauwelaerts, Stevens, Pereboom (RZSA), and Berillon (CNRS) for giving us access to the primate specimens.

KW - primate thumb

KW - morphology

KW - thumb mobility

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M3 - Abstract

ER -

Vereecke E, Vanhoof M, Lu S-C, Kerkhof F. The stability-mobility conflict in the primate thumb. 2016. Abstract from The 11th International Congress of Vertebrate Morphology, Washington, United States.