Glossary P

Period of the fetus refers to the longest period of prenatal development that extends from the 9th until the 38th week after conception.

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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)

Periodic Limb Movements in Sleep or PLMS refers to a sleeping disorder in which the patient's arms or legs jerk during sleep, causing brief arousals. (see also Periodic limb movement disorder)

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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)

Periosteum refers to the dense, fibrous membrane covering the outer surface of the diaphysis.

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Periovulatory period refers to a period of time just before and after the release of the ovum, when fertility is highest.

Peripheral cues are simple features or heuristics that are assumed to show that a message is valid