Anatomy Embryology

4th week
inaudible heart beats
Embryonic Period (2nd week)
-implantation,-yolk sac,-heart is two tubes
1st week (1st lunar month)
-fertilization,-cell cleavage (or cell division), -morula---->gastrula----->blastula-amnion (amniotic fluid) and chorion
mucous lining of the uterus, layer which thickens each month in anticipation of receiving fertilized egg-----> mucous membrane
Embryonic Period
ferilization through 8th week (through the 2nd lunar month or 56th day)
study of human anatomy before birth
structures in the nucleus of a cell that contains the genes (responsible for heredity) for genetic expression
embryonic/fetal membrane that surrounds the amnion
Dominant Gene
a gene that produces a recognizable effect in the organism
deoxyribonucleic acid, the molecular basis for heredity, it is present in chromosomes
ball-like mass of cells in the embryonic period with fluid-filled (amniotic fluid) center
vessel that carries blood away from the heart
embryonic/fetal membrane which gives rise to the amniotic fluid surrounding the baby
Adult-hood period
adolescence to old age
Adolescence Period
"teenagers"- puberty to adulthood
mullberry-like mass of cells, the result of the early cell divisions of the zygote
Lunar Month
28 days of 4 weeks (not a calendar month)
fine downy-like hair on the fetus that begins to appear during the 5th month of prenatal developement and begins to disappear before birth
when the father places the sperm in the mothers body
union of the sperm and egg
Fertilized egg
zygote, after the sperm and the egg unite
Male Gamete
male sex cell, sperm, spermatozoa, spermatozoon, or "the seed"
the female sex cell, the egg
the male sex cell
"seed" the male sex glands that produce the sperm,- found in the scrotal sac or scrotum,- sperm, spermatozoa (outside the body), - spermatozoon (inside the body)
Uterine Tube
fallopian tube, where fertilization generally takes place
exit passageway to the outside of the mothers body
fertilized egg
Ectopic Pregnancy (Tubal Pregnancy)
anytime a fertilized egg attempts to develope outside of the uterus. most common is a tubal pregnancy
Fallopian Tube or Uterine Tube
connects between the ovary and the uterus. this is where fertilization usually takes place
riboneucleic acid, a component of all living cells, it carries the information from the DNA to the protein forming areas of the cell
the sudden active movements of the fetus (about the 5th month)
Recessive Gene
a gene that does not produce a recognizable effect in the organism
when a woman is carrying a baby (fertilization to birth)
the part of the embryonic mass that attaches itself to the uterus (of the mother)
Neonatal Period
newborn- birth through 4th week
Fetal Period
from the 9th week- (3rd lunar month or the 57th day) through birth
ball-like mass of cells in the embryonic period with hollow center
portion of a DNA molecule, the hereditary unit occupying a fixed position in the chromosome, capable of reproducing itself at each cell division and of managing the formation of protein
Gestation Period
the time required for prenatal developement
Heart Beats (Audible)
when the heartbeats can be heard with a stethoscope during the 4th/5th lunar month (fetal)
Heart Beats (Inaudible)
when the heart actually begins to beat durint the first lunar month of developement (embryo)
when the ferilized egg has attached itself to the wall of the uterus (endometrium)
Infancy Period-Infant
end of 4th week to one year
Senescence Period
"old" age to death
Umbilical Chord
the attachment to the placenta (and mother) by the baby in utero, -contains 2 arteries, 1 vein, and whartons jelly
Witch's Milk
fluid from the undeveloped mammary glands of new born babies (male and female)
Whartons Jelly
jelly-like substance surrounding the umbilical vessels
Vernix Caseosa
vanish-like, cheese-like substance on the fetus to protect it from the amniotic fluid
vessel which carries blood towards the heart
Uterus (Fundus,Body, and Cervix)
chamber in mothers body in which the baby developes after the egg has implanted itself
Childhood Period
one year to puberty
6th Month( Fetal Period)
verniz caseosa (varnish-like sheesy substance covering the fetus)
5th week (2nd Lunar Month)
primitive aorta divides into aorta and pulmonary trunk
5th month (Fetal Period)
-quickening (sudden fetal movements) -audible heart beats -lanugo (downy-like hair covering fetus
3rd Calendar Month (Fetal Period)
-hair developes -placenta is in operation
9th week (3rd lunar month)
kidneys are formed
8th week
spleen developes
7th week
heart has four chambers
6th week
-umbilical vessels are present -2 arteries, 1 vein, and whartons jelly
the middle primary germ layer, gives rise to; muscle tissue connective tissue (cartilage bones, lymph, and blood cells)
internal primary germ layer, gives rise to :epithelium of alimentary canal/digestive system (other than the mouth and anal canal) respitory system (other than the nose) urinary, bladder, and urethra
external primary germ layer, gives rise to the nervous tissue, epidermis and its appendages and linnings of mouth or anal canal