Human Foetal Development

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Ummu Sufyaan

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This is just amazing, SubhanAllah!
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Just a little more detail...
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8 weeks
  • Head nearly as large as body; all major brain regions present; first brain waves
  • Liver disproportionately large and begins to form blood cells
  • Limbs present; digits are initially webbed, but fingers and toes are free by the end of this interval
  • Ossification (process of bone formation) just begun; weak, spontaneous muscle contractions occur Cardiovascular system fully functional [heart has been pumping blood since the fourth week)
  • All body systems present in at least rudimentary form
  • Weight: 1 gram [0.03 ounces)

9-12 weeks (Third month)
  • Head still dominant, but body elongating; brain continues to enlarge, shows its general structural features; retina of eye is present
  • Facial features present in crude form
  • Liver prominent and bile being secreted; Roof of mouth(palate) is fusing.
  • Blood cell formation begins in bone marrow ossification accelerating; limbs well molded
  • Gender readily detected

13-16 weeks (Fourth month)
  • Cerebellum becoming prominent; general sensory organs differentiated; eyes and ears assume characteristic position and shape; blinking of eyes and sucking motions of lips occur
  • Body beginning to outgrow head
  • Kidneys attain typical structure
  • Most bones are now distinct and joint cavities are apparent

17-20 weeks (Fifth month)
  • Lanugo (silklike hair) covers skin
  • Limbs reach near-final proportions
  • Quickening occurs [mother feels spontaneous muscular activity of fetus)

21-30 weeks (Sixth and seventh months)
  • Period of substantial increase in weight
  • Eyes are open
  • Skin is wrinkled and red; fingernails and toenails are present; tooth enamel is forming on deciduous teeth
  • Body is lean and well proportioned
  • Bone marrow becomes sole site of blood cell formation

30-40 weeks(eight and ninth months)
  • Skin whitish pink;
  • Weight: 2.7-4.1 kg (6-10 pounds)

Taken from: "Human Anatomy and Physiology." Elanine N. Mareib.
 
Srigengolder said:
What do you make of the tail-like feature at stage 16, anyone?
Click to expand...

The tail is visible when the fetus is about 1 month old because the body frame as not fully developed yet. The "tail" sticks out from the body because the formation of the spine has not developed yet. This "tail" forms into our tailbone or coccyx and this keeps us in a up right position. This small little bone is said to be one of the most important bones in the entire body, because of it's functions.

Hope this helps, I was wondering myself, so I had to go look it up! :)
 
kwolney01 said:
The tail is visible when the fetus is about 1 month old because the body frame as not fully developed yet. The "tail" sticks out from the body because the formation of the spine has not developed yet. This "tail" forms into our tailbone or coccyx and this keeps us in a up right position. This small little bone is said to be one of the most important bones in the entire body, because of it's functions.

Hope this helps, I was wondering myself, so I had to go look it up! :)
Click to expand...

When do the bones begin to develop/introduced?
 

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