Human Growth and Development - Fetal Period and Placenta

Vocabulary flashcards covering fetal growth milestones, pregnancy length, growth restrictions, and placental structure.

Fetal Period

The period from the 9th week to birth, characterized by maturation of tissues and organs and rapid growth of the body.

Sitting Height

Crown-Rump Length

Standing Height

Crown-Heel Length

Length of Pregnancy (LNMP)

280 days or 40 weeks after last normal menstrual period (LNMP)

Length of Pregnancy (Fertilization)

266 days or 38 weeks after fertilization

Lanugo Hairs

Fetal hair occurring during the 4th month of development.

Quickening

A fetal movement milestone that occurs in the 5th month.

Vernix Caseosa

Whitish, fatty substance from seb glands.

IUGR (Intrauterine Growth Restriction)

Fetus who does not achieve the expected in utero growth potential due to genetic or environmental factors, defined as an estimated fetal weight <10th percentile.

Moderate FGR

Defined as BW in the 3rd to 10th percentile.

Severe FGR

Defined as less than the 3rd percentile.

SGA (Small for Gestational Age)

Defined as infants with a BW below the 10th percentile for gestational age.

Placenta

Organ that facilitates nutrient and gas exchange between maternal and fetal compartments.

Fetal Component of Placenta

Derived from the trophoblast and extraembryonic mesoderm, formed by Choriom Frondosum.

Maternal Component of Placenta

Derived from the uterine endometrium, formed by Decidua Basalis.