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In mammals, the term refers chiefly to the early stages of prenatal development, whereas the terms fetus and fetal development describe later stages. [2] [4] The main stages of animal embryonic development are as follows: The zygote undergoes a series of cell divisions (called cleavage) to form a structure called a morula.
The growth rate of a fetus is linear up to 37 weeks of gestation, after which it plateaus. [9] The growth rate of an embryo and infant can be reflected as the weight per gestational age , and is often given as the weight put in relation to what would be expected by the gestational age.
Until about the ninth week of gestational age, [4] the external genitalia of human males and females look the same, and follow a common development. This includes the development of a genital tubercle and a membrane dorsally to it, covering the developing urogenital opening , and the development of the labioscrotal fold .
The Rottweiler (/ ˈ r ɒ t w aɪ l ər /, UK also /-v aɪ l ər /, German: [ˈʁɔtvaɪ̯lɐ] ⓘ) [1] [2] is a breed of domestic dog, regarded as medium-to-large [3] [4] or large. [5] [6] The dogs were known in German as Rottweiler Metzgerhund, meaning Rottweil butchers' dogs, [7] [8] because their main use was to herd livestock [3] and pull carts laden with butchered meat to market. [7]
Drawing of the head of a four-week-old human embryo. From Gray's Anatomy. Embryo drawing is the illustration of embryos in their developmental sequence. In plants and animals, an embryo develops from a zygote, the single cell that results when an egg and sperm fuse during fertilization. In animals, the zygote divides repeatedly to form a ball ...
Photos of what pregnancy tissue from early abortions at 5 to 9 weeks actually looks like have gone viral.. The images, which were originally shared by MYA Network — a network of physicians who ...
An ultrasound showing an embryo measured to have a crown-rump length of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day. Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump).
At 8–12 weeks of gestation, liver is a relatively bigger organ which forms 4-5-5.5% of the total body weight and protrudes through the abdominal wall. By 13 to 32 weeks of gestation, it forms 3.4% to 4.0% of the total body weight. [23] The liver weight hence forms a more or less constant proportion of the total body weight of the fetus. [24]