Evolution of the Human Foot: Evidence from Plio-Pleistocene Hominids

The human foot serves a dual role during locomotion. It functions at times as a mobile structure and at times as a rigid lever. The human foot shows the hallmarks of an arboreal heritage wherein the foot was primarily a grasping organ. Over the course of the human career the human foot has evolved an elaborate plantar aponeurosis, strong plantar ligaments, longitudinal arches, an enlarged musculus flexor accessorius, an adducted (non-opposable) hallux, a remodeled calcaneocuboid joint, a long tarsus, and shortened toes (II to V). Comparisons of the chimpanzee and human foot allow us to reconstruct the pathway of foot evolution. Fossil foot bones of Homo habilis, dated at 1.76 million years, are remarkably like those of modern humans. Foot bones from Hadar, dated at around 3.5 million years, are remarkably chimpanzee-like, with only incipient human traits. The surprising chimpanzee-like qualities of the Hadar fossils strongly support the use of living apes as models of ancestral pongid-hominid morphotypes.

[1]  H. C. Purcer Smith,et al.  Bathing and Vestibular Palsy due to Streptomycin , 1953 .

[2]  THE HUMAN FOOT: ITS EVOLUTION, PHYSIOLOGY AND FUNCTIONAL DISORDERS , 1936 .

[3]  O. J. Lewis.  The evolution of the hallucial tarsometatarsal joint in the Anthropoidea. , 1972, American journal of physical anthropology.

[4]  M. H. Day.  Guide to fossil man , 1977 .

[5]  J T Stern,et al.  Functional Morphology of Homo habilis , 1982, Science.

[6]  J. T. Stern,et al.  Electromyographic Studies of the Human Foot: Experimental Approaches to Hominid Evolution , 1983, Foot & ankle.

[7]  P. R. Davis.  Hominid Fossils from Bed I, Olduvai Gorge, Tanganyika , 1965, Current Anthropology.

[8]  J. T. Stern,et al.  The locomotor anatomy of Australopithecus afarensis. , 1983, American journal of physical anthropology.

[9]  F. Jouffroy,et al.  Proportions longitudinales du pied humain comparées à celles du pied des autres primates , 1978 .

[10]  C. Lovejoy.  The origin of man. , 1981, Science.

[11]  M. D. Russell,et al.  Demography and Human Origins , 1982 .

[12]  Charles Midlo.  Form of hand and foot in primates , 1934 .

[13]  MAN'S POSTURE: ITS EVOLUTION AND DISORDERS. , 1923, American journal of public health.

[14]  C. Lovejoy,et al.  Hominid tarsal, metatarsal, and phalangeal bones recovered from the Hadar Formation: 1974-1977 collections , 1982 .

[15]  R. Leakey,et al.  The fossil hominids and an introduction to their context, 1968-1974 , 1978 .

[16]  Lovejoy Co.  The origin of man. , 1981 .

[17]  H. Elftman,et al.  Chimpanzee and human feet in bipedal walking , 1935 .

[18]  M. H. Day,et al.  Hominid Fossils from Bed I, Olduvai Gorge, Tanganyika: Fossil Foot Bones , 1964, Nature.

[19]  F. Bojsen-Møller,et al.  Calcaneocuboid joint and stability of the longitudinal arch of the foot at high and low gear push off. , 1979, Journal of anatomy.

[20]  G. Hewes,et al.  Food Transport and the Origin of Hominid Bipedalism1 , 1961 .

[21]  C. Lovejoy,et al.  Implications of relative robusticity in the Olduvai metatarsus. , 1972, American journal of physical anthropology.

[22]  C. Lovejoy,et al.  Morphology of the Pliocene partial hominid skeleton (A.L. 288-1) from the Hadar formation, Ethiopia , 1982 .

[23]  V. T. Inman.  The joints of the ankle , 1976 .

[24]  O. J. Lewis.  The comparative morphology of M. flexor accessorius and the associated long flexor tendons. , 1962, Journal of anatomy.

[25]  F Bojsen-Moller,et al.  Plantar aponeurosis and internal architecture of the ball of the foot. , 1976, Journal of anatomy.

[26]  W. C. Osman Hill,et al.  Primates : comparative anatomy and taxonomy , 1953 .

[27]  R. L. Susman,et al.  Functional and morphological affinities of the subadult hand (O.H. 7) from Olduvai Gorge. , 1979, American journal of physical anthropology.

[28]  Bernard Wood,et al.  Functional Affinities of the Olduvai Hominid 8 Talus , 1968 .

[29]  H Elftman,et al.  The Evolution of the Human Foot, with Especial Reference to the Joints. , 1935, Journal of anatomy.

[30]  F. P. Lisowski.  Angular growth changes and comparisons in the primate talus. , 1967, Folia primatologica; international journal of primatology.

[31]  F Bojsen-Møoller,et al.  Anatomy of the forefoot, normal and pathologic. , 1979, Clinical orthopaedics and related research.

[32]  Hans Gerber,et al.  The dynamic pattern of different foot-types , 1982 .

[33]  S. Washburn,et al.  Behaviour and the Origin of Man , 1967 .

[34]  Orang-outang, sive Homo sylvestris, or, The anatomy of a pygmie : a facsimile , 1966 .

[35]  F. Weidenreich.  The external tubercle of the human tuber calcanei , 1940 .