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The proximodistal trend is the tendency for more general functions of limbs to develop before more specific or fine motor skills. It comes from the Latin words proxim- which means "close" [ 1 ] and "-dis-" meaning "away from", [ 2 ] because the trend essentially describes a path from the center outward.
Proximodistal and craniocaudal axes are not considered to be independently specified, but instead emerge by transitions in the number of parallel elements as the undifferentiated apical zone of the growing limb bud undergoes reshaping. [35] This model only specifies a "bare bones" pattern.
The cephalocaudal trend, or cephalocaudal gradient of growth, refers to the pattern of changing spatial proportions over time during growth. One example of this is the gradual change in head size relative to body size during human growth.
Sequential – certain motor patterns precede others. Cumulative – current movements are built on previous ones. Directional – cephalocaudal or proximodistal; Multifactorial – numerous-factors impact; Individual – dependent on each person; In the childhood stages of development, gender differences can greatly influence motor skills.
Like physical growth, motor development shows predictable patterns of cephalocaudal (head to foot) and proximodistal (torso to extremities) development, with movements at the head and in the more central areas coming under control before those of the lower part of the body or the hands and feet. [91]
The zone of polarizing activity (ZPA) is an area of mesenchyme that contains signals which instruct the developing limb bud to form along the anterior/posterior axis. Limb bud is undifferentiated mesenchyme enclosed by an ectoderm covering.
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Development Growth & Differentiation is a peer-reviewed scientific journal published by Wiley on behalf of the Japanese Society of Developmental Biologists. It was established in 1950 as Embryologia, obtaining its current title in 1969. [1] The editor-in-chief is Masanori Taira (Chuo University).