Appendix 1
The Chronological Development of The Unborn Child

 

Sixth Week

 

Timing

Source
The upper and lower lips are forming. Early in 6th week after fertilization Moore, p 523
The tongue is developing.
Early in 6th week after fertilization Moore, p 523
The eye is obvious, reflecting the fact that the retinal pigment has formed. 6th week after fertilization Moore, p 94
The upper and lower eyelid primordia appear. 6th week of development. Larsen, p 259
The primordia of the fingers, called digital rays, start to develop. 6th week after fertilization Moore, p 94
Hiccups first occur. 6th week after conception Roodenburg, p 32
The ends of the limb buds become flattened to form foot plates. 6th week of development Sadler p 172
The oral cavity is developing. 6th week Sadler, p 376
Spontaneous movements, such as twitching of the trunk and limbs, have been reported. 6th week after fertilization Moore, p 94
The pelvis is developing. 6th week Sadler, p 308
Movement of the muscles is being controlled by the nervous system. 6th week after conception Rugh, p 34
It is believed that the majority of women do not realize they are pregnant during the first six weeks after conception. 6th week after conception Rugh, p 54
In a study of 12 fetuses, the longest median period of inactivity was 260 seconds. 6th week after conception de Vries (1985), p 102
The testes become identifiable. 6th week

O'Rahilly, p 210

The ureter is developing. 6th week Sadler, p 308
Some salivary glands appear. About 6th week after fertilization Moore, p 236
General movements first occur. 6th -7th weeks after conception Roodenburg, p 31
The fetus normally moves spontaneously. 6th-8th weeks after conception de Vries (1982), p 318
The heart is contracting at a rate of 40 to 80 beats per minute, as measured with an electrocardiogram. 6th - 7th weeks after conception Rugh, p 53
The salivary glands begin to develop 6th - 7th weeks after fertilization England, p 90
The uterus forms. 6th - 7th weeks Larsen, p 175
The vagina forms. 6th - 7th weeks Larsen, p 175
Startles first occur. 6 - 7 1/2 weeks after conception Nijhuis/de Vries, p 5
General movements first occur. 6 1/2 - 7 1/2 weeks after conception Nijhuis/de Vries, p 5
Hiccups first occur. 6 1/2 - 8 1/2 weeks after conception Nijhuis/de Vries, p 5
The aorta is developing. Day 36 of development Larsen, p 156
Ear swelling is present. Day 36 after fertilization Sadler, front pages
The oral and nasal cavities are confluent. Day 36 after fertilization Moore, p 5
All of the muscle blocks have appeared. Day 36 after conception Rugh, p 46
The pancreas is developing. Approximately day 36 Sadler, p 281
The thyroid is developing. Approximately day 36 Sadler, p 281
Digital rays are present in the foot plates. Days 36-42 of development Sadler, p 110
Digital rays are present in the hand plates. Days 36-42 of development Sadler, p 110
The feet have become distinct. Day 37 of development Larsen, p 209
Foot plates are formed on the lower limb buds. Day 37 after fertilization Larsen, p xii
The legs have become distinct. Day 37 of development Larsen, p 209
The thigh has become distinct. Day 37 of development Larsen, p 209
Pigment can be seen in the retina. Days 37-40 after fertilization Moore, p 91
The eye muscles begin to form. Day 38 after conception Rugh, p 47
Finger rays are visible. Day 38 of development Larsen, p 209
Finger rays are developing. Day 38 after fertilization Sadler, front pages
The upper and lower jaws begin to fuse in the midline of the face. Day 38 after conception Rugh, p 47
The nose is formed. Day 38 after fertilization Moore, p 5
It is probable that the heartbeat of the embryo is similar to an adult's heartbeat. Week 5 1/2 after conception Rugh, p 53
The urinary bladder is developing. Day 39 after fertilization Sadler, front pages
The pancreas is developing. Day 39 after fertilization Sadler, front pages
The liver is developing. Day 39 after fertilization Sadler, front pages
The foundation of the sense of smell is established when nerve fibers connect with the olfactory lobe in the brain. Day 39 after conception Rugh, p 47
The eyelids are developing. Day 40 after conception Moore, p 238
The eyes become pigmented. Day 40 after conception Rugh, p 47
The diaphragm forms. Day 40 after conception Rugh, p 47
The forehead is developing. Day 40 after fertilization Moore, p 238
The jaws are well-formed. Day 40 after conception Rugh, p 47
The lower jaw is developing. Day 40 after fertilization Moore, p 238
The kidneys are forming. Day 40 of development Larsen, p 156
The nostrils are developing. Day 40 after fertilization Moore, p 238
The teeth begin to form. Day 40 after conception Rugh, p 47
Digital rays are clearly visible in the hand plates. Days 41-43 after fertilization Moore, p 91
The rudiments of the fingers become evident. Day 42 after conception Rugh, p 47
The earliest reflexes begin. Day 42 after conception Rugh, p 47
The penis begins to form. Day 42 after conception Rugh, p 47
The rudiments of the toes become evident. Day 42 after conception Rugh, p 47
The eye is obvious. About day 42 after fertilization Moore, p 99
The pigmented eye is developing. About 42 days after fertilization Moore, p 99


 


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