Chapter 4 Flashcards
Prenatal development
organogenesis
the process of organ formation in humans. (0-10 weeks)
zygote
The human organism from fertilization until 2 weeks.
foetus
the human organism 12 weeks after conception until birth.
embryo
The human organism from 2 until 10 weeks
neonate
an infant less than a month old
postnatal development
The development of a human after they are born.
synaptogenesis
the building of connections between nerve cells
apoptosis
programmed cell death
ectoderm
outermost of the 3 primary germ layers of the embryo. The central nervous system and skin develop from it.
neural plate
The thickened ectoderm that will form the brain. Arises at day 18 of gestation.
neural tube
The folded neural plate that will become the brain and the spinal column.
neurogenesis
the birth of neurons
cell migration in the cortex
cells migrating to their innermost layer.
formation of sulci and gyri
By 6 moths
term
the end of pregnancy
rooting reflex
babies moving towards where their cheek is being touched.
chemosensory system
Both gustatory and olfactory senses, (taste and smell)
fluid intake
In blood not broken down as much as in the amniotic fluid.
colostrum
The breast fluid that precedes true milk.
vestibular system
the sensory system that contributes to balance and space orientation.
righting reflex
by 25 weeks
preterm
Born prematurely, considered this if born before 38 weeks of pregnancy
circadian rhythm
bodily cycles that occur on a 24 hour cycle.
baby and vision
eyelids only open at 5-7 months and when they open barely any stimuli.
