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This stage occurs during the first two weeks of conception as the zygote moves through the fallopian tubes and attaches to uternine wall.
Germinal stage
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The zygote is made of two cells:
Trophoblast (outer cell) and Blastocyst (inner cell)
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This fetal stage begins at two weeks and extends to the 8th week
Embryonic Stage
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At 2 weeks, the embryo attaches to the uterus and consists of 2 types of cells:
- Endoderm (inner layer/digestive tract) and
- Ectoderm (outer layer/skin, hair, nervous system)
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3 weeks after conception, the embryo develops this layer between the ectoderm and endoderm:
Mesoderm (skeleton, muscles)
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These supporting membranes develop during the embryonic period:
Amnion, placenta, umbilical cord
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Primitive heart pumps blood, eyes start to appear, spine forms, parts of brain develop, and limb buds are visible at this stage of fetal development:
4 weeks
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At this stage, the embryo can be seen by ultrasound and the skeleton is recognizable
6 1/2 weeks
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At this stage, movement can first be seen
7 1/2 weeks
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At this stage, the embryo is sensitive to touch, has hiccups, slow genreral movement and quick startle movements:
8 weeks
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When does the fetal stage begin?
9 weeks
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At this fetal stage, breathing movements and jaw opening/stretching may be observed
10-10 1/2 weeks
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Yawning, rythmic sucking and swallowing is observed at this stage
11-12 weeks
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Fetus can kick, turn its limbs and head, open mouth, swallow and make a fist. External sex organs are visible, the fetus is 3 in long and weighs 1 ounce.
12 weeks (3rd month after conception)
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Brain tissue can be damaged during this time period in utero:
10-18 weeks
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When can you do an amniocentesis?
16-20 weeks
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At what stage can the mother feel fetus' movement for the first time?
20 weeks
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When does the fetus become covered in the vernix casiosa (protects skin during long immersion in amniotic fluid)?
5th month after conception (20 weeks)
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When does the fetus develop lanugo (fine hair covering the body)
5th month after conception
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At this stage, the eyes and eyelids are completely formed; the fetus moves and sleeps at regular intervals
6th month after conception
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At this stage, the fetus can hear sounds
25-28 weeks (end of 2nd trimester/beginning of 3rd trimester)
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At this stage, the fetus has reached the age of viability
28 weeks
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At this stage, the fetus gains weight and biological functions are refined
8th-9th month
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at this stage, the fetus is sensitive to light, touch, and sound
8th-9th month
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At this infant stage, the reflexive unlar grasp develops
12 weeks
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At this infant stage, mouthing of fingers and mutual fingering is present
16 weeks
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At this infant stage, there is a primitive squeeze without palm or thumb involvement
20 weeks
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At this infant stage, palmar or squeeze grasp is present but still without thumb involvement. Eyes and hands combine for grasp
24 weeks
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At this infant stage, whole hand grasp develops, infant can transfer object from one hand to another
28 weeks
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At this stage, inferior scissors grasp develops
32 weeks
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At this infant stage, the radial-digital grasp develops
36 weeks
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At this infant stage, the inferior pincer graso develops and the beginning of voluntary release.
40 weeks
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At this infant stage, the neat pincer grasp with slight extension of the wrist develops
44 weeks
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At this infant stage, superior-forefinger grasp develops, with wrist extended and deviated to ulnar side; smooth release for large objects and awkward for small objects
52 weeks
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What does APGAR stands for?
Appearance, Pulse, Grimace, Activity, Respiration
Each category worth 2 pts for a total of 10
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Asymmetrical tonic neck reflec occurs when?
0-4 months
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Symmetric tonic neck reflex occurs when?
2-4 months
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Tonic labyrinthine reflex occurs when?
1-4 months
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Startle reflex occurs when?
From birth
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Rooting develops when?
0-4 months
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Sucking develops when?
0-5 months
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Suck-Swallow reflex develops when?
0-18 months
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Gag reflex occurs when?
From birth
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Bite reflex occurs when?
0-6 months
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What are the abnormal oral movements of an infatnt?
Jaw thrusting, lip pursing, lip retraction, tongue retraction, tongue thrust, and tonic biting
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These are examples of what kind of syndrome: Cornelia de Lange and Prader-Willi
Sporadic Syndrome
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Which syndrome is neurological?
Sturge-Weber Syndrome
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Down Syndrome, Cri du Chat, Turner, and Williams Syndromes are all types of ?
Chromosomal Syndromes
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Pierre-Robin is what kind of syndrome?
Polygenetic Mulitfactorial Syndrome
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Hunter Syndrome & Tay-Sachs are what kind of syndromes?
Metabolic
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Apert, CHARGE, Noonan, Sotos, Stickler, Treacher-Collins, & Waardenburg are all types of what?
Autosomal Dominant
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Usher, Laurence-Moon, Riley-Day, Jervell and Lange-Nielson, Cockayne, and Bardet-Biedl are all types of?
Autosomal Recessive Syndromes
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