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Embryo- development
4-week intervals in embryological development
45
Medical
Professional
09/23/2010

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Cards

Term
Head constitutes half of the crown-heel length
Definition
9-12 weeks
Term
Broad face, widely separated eyes, low-set ears
Definition
9-12 weeks
Term
Primary ossification centers begin to appear
Definition
9-12 weeks
Term
Upper limbs almost full-length, lower limbs not as developed
Definition
9-12 weeks
Term
External genitalia begin to differentiate
Definition
9-12 weeks
Term
Intestinal coils return from umbilical cord to fetal abdomen
Definition
9-12 weeks
Term
Erythropoiesis shifts from liver to spleen
Definition
9-12 weeks
Term
Urine formation begins
Definition
9-12 weeks
Term
Period of rapid growth
Definition
13-16 weeks
Term
Limb movements begin, but are unnoticeable
Definition
13-16 weeks
Term
Skeleton ossifies
Definition
13-16 weeks
Term
Slow eye movements begin
Definition
13-16 weeks
Term
Scalp hair patterning is determined
Definition
13-16 weeks
Term
Sex of fetus becomes clearly recognizable
Definition
13-16 weeks
Term
Eyes begin to face anteriorly (instead of anterolaterally)
Definition
13-16 weeks
Term
Ears move to proper position on sides of head
Definition
13-16 weeks
Term
Period of slower growth
Definition
17-20 weeks
Term
Fetal movements (quickening) commonly felt
Definition
17-20 weeks
Term
Skin is covered in "vernix caseosa"
Definition
17-20 weeks
Term
Eyebrows and head hair become visible
Definition
17-20 weeks
Term
"Lanugo"- fine, downy hairs, cover the body
Definition
17-20 weeks
Term
Brown fat- a primary heat producer- is formed
Definition
17-20 weeks
Term
Ovaries are differentiated and contain primordial oogonia
Definition
13-16 weeks
Term
Uterus is formed and canalization of the vagina begins
Definition
17-20 weeks
Term
Testes begin to descend
Definition
17-20 weeks
Term
Period of substantial weight gain
Definition
21-25 weeks
Term
Rapid eye movements begin
Definition
21-25 weeks
Term
Type 2 pneumocytes begin to secrete surfactant
Definition
21-25 weeks
Term
Fingernails become present
Definition
21-25 weeks
Term
First point at which premature delivery may be successful, although resp. system is still very immature
Definition
21-25 weeks
Term
Stage wherein premature delivery often results in survival
Definition
26-29 weeks
Term
Lungs and pulmonary vasculature are sufficiently developed to provide adequate gas exchange
Definition
26-29 weeks
Term
CNS can direct breathing and control body temperature
Definition
26-29 weeks
Term
Eyelids open
Definition
26-29 weeks
Term
Toenails become visible
Definition
26-29 weeks
Term
Period during which quantity of white fat increases significantly
Definition
26-29 weeks
Term
Erythropoiesis shifts from the spleen to bone marrow
Definition
26-29 weeks
Term
MRIs produce clear images
Definition
26-29 weeks
Term
Pupillary light reflex of the eyes is effective
Definition
30-34 weeks
Term
Period during which premature delivery usually results in survival
Definition
30-34 weeks
Term
"Premature by date" as opposed to "premature by weight"
Definition
30-34 weeks
Term
Firm grasp develops
Definition
35-38 weeks
Term
Spontaneous orientation to light
Definition
35-38 weeks
Term
Circumferences of the head and abdomen are approximately equal
Definition
35-38 weeks
Term
Testes descend into the scrotum
Definition
35-38 weeks
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