Glossary P
Glossary P
Period of the embryo refers to the second phase of prenatal development, lasting from the 3rd to the 8th prenatal week, during which the major organs and anatomical structures take shape.
Period of the fetus refers to the longest period of prenatal development that extends from the 9th until the 38th week after conception.
Period of the zygote refers to the first phase of prenatal development that lasts from conception until the developing organism becomes firmly attached to the wall of the uterus.
Periodic Limb Movement Disorder refers to a disorder charaterized by repeated involuntary movement of the legs and sometimes arms during sleep. (Please see Periodic Limb Movements in Sleep or PLMS)
Periodicity pitch refers to the constancy of a complex tone’s pitch when the fundamental frequency and other lower harmonics are eliminated. (Please see also Effect of the missing fundamental)