INVESTIGADORES
CANDELA Adriana Magdalena
artículos
Título:
Anatomy of the hindlimb musculature in the cursorial
Autor/es:
CESAR GARCÝA-ESPONDA, AND ADRIANA M. CANDELA
Revista:
MAMMALIA
Editorial:
WALTER DE GRUYTER & CO
Referencias:
Año: 2010 p. 407 - 422
ISSN:
0025-1461
Resumen:
The musculature of the hindlimb of the cursorial caviomorph
Dasyprocta azarae is described and functionally evaluated,
together with osteological associated traits. Our results show
that several features are indicative of emphasized parasagittal
movements and stabilized joints. Mm. glutei are relatively
well developed, in agreement with an enhanced extension of
the hip joint. The relative elongation of the ischium indicates
an improved mechanical advantage of the hamstring muscles,
required for powerful extension of the hip. M. iliopsoas
would act mainly as a protractor of the femur rather than as
a rotator. M. peroneus brevis, an evertor and plantarflexor of
the foot, is absent. The inversion of the pes would be
reduced, such as expressed by the marked reduction of the
m. tibialis caudalis. Osteological characters are arranged to
facilitate parasagittal movements and to restrict joint mobility.
Some features of Dasyprocta (e.g., presence of a gluteal
tongue of m. gluteus medius, reduction in number of m. lumbricales,
presence of a gluteal crest of the ilium) are interpreted
as potential synapomorphies of cavioids. Other
features associated to cursoriality (absence of mm. peroneus
brevis, reduction of m. tibialis caudalis) would have been
acquired independently in the extreme cursorial cavioids
tongue of m. gluteus medius, reduction in number of m. lumbricales,
presence of a gluteal crest of the ilium) are interpreted
as potential synapomorphies of cavioids. Other
features associated to cursoriality (absence of mm. peroneus
brevis, reduction of m. tibialis caudalis) would have been
acquired independently in the extreme cursorial cavioids
together with osteological associated traits. Our results show
that several features are indicative of emphasized parasagittal
movements and stabilized joints. Mm. glutei are relatively
well developed, in agreement with an enhanced extension of
the hip joint. The relative elongation of the ischium indicates
an improved mechanical advantage of the hamstring muscles,
required for powerful extension of the hip. M. iliopsoas
would act mainly as a protractor of the femur rather than as
a rotator. M. peroneus brevis, an evertor and plantarflexor of
the foot, is absent. The inversion of the pes would be
reduced, such as expressed by the marked reduction of the
m. tibialis caudalis. Osteological characters are arranged to
facilitate parasagittal movements and to restrict joint mobility.
Some features of Dasyprocta (e.g., presence of a gluteal
tongue of m. gluteus medius, reduction in number of m. lumbricales,
presence of a gluteal crest of the ilium) are interpreted
as potential synapomorphies of cavioids. Other
features associated to cursoriality (absence of mm. peroneus
brevis, reduction of m. tibialis caudalis) would have been
acquired independently in the extreme cursorial cavioids
tongue of m. gluteus medius, reduction in number of m. lumbricales,
presence of a gluteal crest of the ilium) are interpreted
as potential synapomorphies of cavioids. Other
features associated to cursoriality (absence of mm. peroneus
brevis, reduction of m. tibialis caudalis) would have been
acquired independently in the extreme cursorial cavioids
is described and functionally evaluated,
together with osteological associated traits. Our results show
that several features are indicative of emphasized parasagittal
movements and stabilized joints. Mm. glutei are relatively
well developed, in agreement with an enhanced extension of
the hip joint. The relative elongation of the ischium indicates
an improved mechanical advantage of the hamstring muscles,
required for powerful extension of the hip. M. iliopsoas
would act mainly as a protractor of the femur rather than as
a rotator. M. peroneus brevis, an evertor and plantarflexor of
the foot, is absent. The inversion of the pes would be
reduced, such as expressed by the marked reduction of the
m. tibialis caudalis. Osteological characters are arranged to
facilitate parasagittal movements and to restrict joint mobility.
Some features of Dasyprocta (e.g., presence of a gluteal
tongue of m. gluteus medius, reduction in number of m. lumbricales,
presence of a gluteal crest of the ilium) are interpreted
as potential synapomorphies of cavioids. Other
features associated to cursoriality (absence of mm. peroneus
brevis, reduction of m. tibialis caudalis) would have been
acquired independently in the extreme cursorial cavioids
tongue of m. gluteus medius, reduction in number of m. lumbricales,
presence of a gluteal crest of the ilium) are interpreted
as potential synapomorphies of cavioids. Other
features associated to cursoriality (absence of mm. peroneus
brevis, reduction of m. tibialis caudalis) would have been
acquired independently in the extreme cursorial cavioids
Dasyprocta (e.g., presence of a gluteal
tongue of m. gluteus medius, reduction in number of m. lumbricales,
presence of a gluteal crest of the ilium) are interpreted
as potential synapomorphies of cavioids. Other
features associated to cursoriality (absence of mm. peroneus
brevis, reduction of m. tibialis caudalis) would have been
acquired independently in the extreme cursorial cavioids
Dasyprocta and Dolichotis.and Dolichotis.