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Major events during embryonic development
Major events during embryonic development
60
Medical
Graduate
08/21/2010
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Term
Beginning of fetal period
 Definition
week 9
Term
Elongation of legs
 Definition
week 9
Term
Differentiation of external genitalia: can distinguish b/t male and female
 Definition
week 9
Term
Face has human profile due to growth of chin
 Definition
week 10
Term
Genitalia more pronounced
 Definition
week 10
Term
Rapid length increase
 Definition
4-5 mos
Term
Slight weight increase
 Definition
Mos. 4-5
Term
Lanugo hair, eyebrows, and head hair
 Definition
Mos. 4-5
Term
Respiratory movement
 Definition
Mos. 4-5
Term
Fetal movement felt by mom
 Definition
Mos. 4-5
Term
Sucking movement
 Definition
Mos. 6-7
Term
Sucking movement
 Definition
Mos. 6-7
Term
Sucking movement
 Definition
Mos. 6-7
Term
Sounds heard by fetus
 Definition
Mos. 6-7
Term
Lack of sufficient CNS and respiratory development
 Definition
mos. 6-7
Term
deposition of subcutaneous fat
 Definition
mos. 7-9
Term
skin covered with vernix caseosa
 Definition
mos. 7-9
Term
skull with greatest circumference
 Definition
mos. 7-9
Term
descent of baby head
 Definition
mos. 7-9
Term
rupture of membranes
 Definition
mos. 7-9
Term
upper limbs longer and bent at elbows
 Definition
week 8
Term
prominent forehead
 Definition
week 8
Term
external genitalia in sexless state, but begin to differentiate
 Definition
week 8
Term
separation of the urogenital sinus and anus via urorectal septum
 Definition
week 8
Term
indication of eye and knee
 Definition
week 8
Term
initial development of the eyelid
 Definition
week 7
Term
genital tubercle swelling
 Definition
week 7
Term
initial formation of urorectal septum
 Definition
week 7
Term
can see external ear
 Definition
week 7
Term
Oral and nasal cavities are confluent
 Definition
week 6
Term
upper lip and nose formed
 Definition
week 6
Term
external acoustic meatus present
 Definition
week 6
Term
can see digital rays of hands
 Definition
week 6
Term
lens pits, optic cups, and nasal pits forming
 Definition
week 5
Term
budding of lower limbs
 Definition
week 5
Term
heart begins to beat
 Definition
week 4
Term
primordia of ear and eye are present
 Definition
week 4
Term
initial development of pharyngeal arches
 Definition
week 4
Term
budding of upper limbs
 Definition
week 4
Term
first missed menstrual period
 Definition
week 3
Term
migration of mesenchymal cells
 Definition
week 3
Term
migration of cells of the primitive streak
 Definition
week 3
Term
formation of neural plate
 Definition
week 3
Term
initial development of the somites
 Definition
week 3
Term
thyroid gland begins to develop
 Definition
week 3
Term
formation of notochord
 Definition
week 3
Term
amniotic cavity forms
 Definition
week 2
Term
lacunae appear in the syncytiotrophoblasts
 Definition
week 2
Term
primary yolk sac forms
 Definition
week 2
Term
complete implantation
 Definition
week 2
Term
uteroplacental circulation begins
 Definition
week 2
Term
chorionic cavity forms
 Definition
week 2
Term
prechordal plate and primitive streak seen on embryonic disk
 Definition
week 2
Term
fertilization
 Definition
week 1
Term
zygote divides
 Definition
week 1
Term
morula stage
 Definition
week 1
Term
early blastocyst
 Definition
week 1
Term
late blastocyst (trophoblast and embryoblast distinguishable)
 Definition
week 1
Term
implantation
 Definition
week 1
Term
start of gastrulation
 Definition
week 3
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