Embryonic age

(noun)

Measures the actual age of the embryo or fetus from the time of fertilization.

Related Terms

  • Gestational age
  • chorionic membrane
  • teratogens

Examples of Embryonic age in the following topics:

  • Fifth Through Eighth Weeks of Development

    • Embryonic age measures the actual age of the embryo or fetus from the time of fertilization.
    • Thus, the first week of embryonic age is already week three counting with gestational age.
    • The number of the week (used here) is one more than the actual age of the embryo/fetus.
    • The features are consistent with a developmental age of seven weeks (the ninth week of menstrual age).
    • This embryo is about five weeks old (or from the seventh week of menstrual age).
  • Development of the Extraembryonic Coelom

    • An artificially colored image of the contents in the cavity of the uterus seen at approximately 5 weeks of gestational age by obstetric ultrasonography.
  • Embryonic and Fetal Bone Formation

    • Embryonic/fetal development proceeds from rostral (nose and mouth area) to caudal (posterior).
    • Embryonic mesenchymal cells (MSC) condense into layers of vascularized primitive connective tissue.
  • Bilaminar Embryonic Disc Development

  • The Middle Years

    • Middle age is the period of age beyond young adulthood but before the onset of old age.
    • Census lists middle age as including people aged from 35 to 54, while developmental psychologist Erik Erikson argues that middle adulthood occurs from the age of 40 until 65.
    • Middle-aged adults often show visible signs of aging such as the loss of skin elasticity and the graying of hair.
    • However, people age at different rates and there can be significant differences between individuals of the same age.
    • However, the majority of middle-age people in industrialized nations can expect to live into old age.
  • Dividing the lifespan

    • Human life is often divided into various age spans, like the following:
    • In many countries, such as Sweden, adulthood legally begins at the age of eighteen.
    • This is a major age milestone that is marked by significantly different attitudes toward the person who undergoes the transition.
  • Effects of Aging on the Integumentary System

    • Intrinsic and extrinsic aging are terms used to describe cutaneous aging of the skin and other parts of the integumentary system.
    • The effects of intrinsic aging are caused solely by internal factors.
    • Sometimes called chronological aging, intrinsic aging is an inherent degenerative process due to declining physiologic functions and capacities.
    • As skin ages, it becomes thinner and more easily damaged.
    • Photodamage implies changes beyond those associated with aging alone.
  • Embryonic Development

  • Development of Nervous Tissue

    • Embryonic neural development includes the birth and differentiation of neurons from stem cell precursors.
  • Animal Reproduction and Development

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