Download Second Week of Growth

Human Development
By: Brittani Beckman
and
Jessica Grier
First Week of Growth
• During the first
week the ovum is in
the uterine tube.
• The ovum is in a
form of a sac. The
outer wall of the sac
consists of a layer
of trophoblast.
Inside the sac is a
thin layer of
mesoderm composed
of round, oval, and
spindle-shaped cells.
Second Week of Growth
• By the end of this week the
ovum has increased
considerably in size, and the
majority of its villi are
vascularized.
• The embryo has developed a
definite form, and its cephalic
and caudal extremities are
easily distinguished.
• The neural folds are partly
united, and the embryo is
completely separated from the
yolk-sac.
Third Week of the Human Embryo
• By the end of the third week the
embryo is strongly curved.
• Divisions of the brain are visible.
• Optic and auditory vesicles are formed.
Fourth Week of Growth
• The embryo is markedly
curved on its side. When
viewed it is almost
circular in outline.
• The cerebral
hemispheres appear as
hollow buds, and the
elevations which form the
basics of the auricula are
visible. The limbs now
appear as oval flattened
projections.
Fifth Week of Growth
• The embryo is less curved by the fifth
week.
• The head is relatively a large size.
• Differentiation of the limbs into their
segments occur
• The nose is short and flat.
Sixth Week of Growth
• The curve of the embryo is more diminished.
• The branchial grooves, except for the first, have
disappeared, and the structures of the fingers and
toes can be recognized.
Seventh and Eighth Week
Growth of the Human Embryo
• The neck is somewhat
lengthened
• The upper lip is
completed and the
nose is more developed
• Measures from 28 to
30 mm in length
Third Month of Growth
• The head has extended and the neck has lengthened.
• The eyelids meet and fuse, remaining closed until the end of the sixth
month.
• The limbs are well developed and nails appear on fingers and toes.
• The external generative organs are so far differentiated that it is
possible to distinguish the sex. By the end of this month the length of
the fetus is about 7 cm.
Fourth Month
• The loop of the gut is developed
into the umbilical cord which is
withdrawn from the fetus.
• The fetus ranges from 12 to 13
centimeters long but if you
include the legs then it ranges
from about 16 to 20 centimeters.
The Fifth Month of Human
Embryo Growth
• During the Fifth
Month the first
movement of the
fetus begins.
• Hair is now
erupting from the
skull.
• The fetus is about
25 to 27 cm.
Sixth Month of Human Growth
• The body is covered
with fine hairs.
• The papilla of the skin
are developed.
• The measure from the
vertex to the heels, the
total length of the fetus
at the end of this month
is from 30 to 32 cm.
Seventh Month of
Human Growth
•The eyes lids and pupillary
membranes open.
•From vertex to heels the total
length at the end of the seventh
month is from 35 to 36 cm.
•The weight is about a little over
three pounds.
Eighth Month of
Human Growth
• The skin is a pink color
and is now entirely
coated with protective
material, and the fine
hairs begin to disappear.
• The fetus presents a
plump appearance. The
total length, from head to
heels, at the end of the
eighth month is about 40
cm. The weight varies
between 4 ½ and 5 ½
pounds.
Nine Months
• From Head to
Heels the fetus
measures about
50 centimeters.
• It weighs about
6 ½ pounds.
• End of
Pregnancy
Child Development 0-1 Years
• Baby is in cognitive
development
• Process of memory
• Learning mothers
voice
• Language
development begins
• Developing bonds
of love and trust
with parents
Child Development 1-2 Years
• During this time, your
child is becoming more
mobile.
• Likes to explore new
objects and people.
• Can recognize himself in
pictures or mirrors.
• Imitates the behaviors of
others.
• Is able to recognize
familiar names or
phrases.
Child at Ages 2-3
• Child asserts their independence
• Experiences huge intellectual, social and
emotional changes
• Is able to follow two to three phrase
commands, sort objects by shape and
color, imitate the actions of adults and
playmates, and express a wide range of
emotions
Children at Ages 3-5 Years
• Your child will begin preschool.
• He or she will focus more on people outside of their family,
and want to find out more about them.
• Will be able to ride a tricycle, sing a song, and dress
themselves.
Middle Childhood (6-8)
• Begins to develop independence from the
family
• Is able to do everyday things such as tying
a shoe and getting dressed
• Child begins school
• Physical, social, and mental skills develop
rapidly at this time
Children at Ages 9-11 Years Old
• Healthy friendships are important to your child.
• Children will encounter peer pressure, but can also decide from right and
wrong.
• Physical changes of puberty are starting to appear more.
• Will face more academic challenges during school.
SOURCES
• http://education.yahoo.com/reference/gray/subjects/
subject?id=15
• http://www.cdc.gov/ncbddd/child
• http://www.cdc.gov/ncbddd/child/infants.htm
• http://www.cdc.gov/ncbddd/child/toddlers1.htm
• http://www.cdc.gov/ncbddd/child/toddlers2.htm
• http://www.cdc.gov/ncbddd/child/preschoolers.htm
• http://www.cdc.gov/ncbddd/child/middlechildhood.
htm
• http://www.cdc.gov/ncbddd/child/middlechildhood
9-11.htm