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Embryo
Timeline
32
Anatomy
Post-Graduate
08/27/2013

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Cards

Term
Days 1-2
Definition
- Zygote formation (male and female pronnuclei fuse)
- Zygote immediately divides
Term
Days 3-4
Definition
- Morula forms
Term
Days 5-6
Definition
- Blastocyst forms
- Enters Uterus
- Zona Pellucida disappears
Term
Days 6-7
Definition
- Uterine attachment
Term
Day 8
Definition
- Bilaminar Embryo
- 2 parts of trophoblast
- 2 parts of embryoblast
-2 cavities
- 2 membranes
- Establish dorsal/ ventral
Term
Day 9
Definition
- Lacunar formation
- implantation nearly complete
- primary yolk sac
- extraembryonic mesoderm forms
Term
Day 10
Definition
- Lacunar networks form (maternal/ paternal circulation)
- Decidual Rxn occurs- forms immunologically protected site
- Implantation bleeding.
Term
Day 12
Definition
- Extraembryonic membrane begins to split
- Beginning of chorionic cavity
Term
Day 13
Definition
- Chorionic cavity forms (3 layers)- form barrier
- primary chorionic villi form
Term
Day 14
Definition
- Connecting stalk forms
- prechordal plate forms (location of mouth)
- Secondary yolk sac forms
Term
Day 15-16
Definition
- Trilaminar embryo ( 3 layers)
- migration of cells
- prechordal plate forms mouth
Term
Day 18
Definition
- Notochordal process becomes notochord
- Neural tube forms
- mesoderm divides into 3 layers
- lateral plate mesoderm begins to split
Term
Day 21
Definition
- Neural tube fuses (will form brain and spinal cord)
- Neural canal forms (will form ventricular system)
- Neural crest forms (will form ganglia & adrenal medulla)
- Lateral plate forms 2 layers
- intraembryonic coelom forms
- tertiary chorionic villus has core of capillaries
- placental barrier forms
Term
Days 24-25
Definition
-Closure of anterior neuropore
Term
Days 26-27
Definition
- closure of posterior neuropore
- head (heart moves caudal to mouth) and tail (connecting stalk moves to ventral location) folds occur
- Lateral folding occurs (body becomes tubular)
Term
Day 20
Definition
- Heart begins to beat ( 22-23 days)
- Cardinal and viteline veins develop
- Umbilical artery develops
- Aortic arches develop
- heart tubes develop
Term
Day 22
Definition
- Sagittal fold occurs
- three folds form (lateral, head, and tail) (folds continue until day 26?)
Term
4th Week
Definition
- Heart begins to beat (22-23 days)
- Folding
- Limb buds
- Pharyngeal arches
Term
5th Week
Definition
Face starts
Term
6th Week
Definition
- Digital rays
- Spontaneous movement
- Gut herniation begins
- joint formation critical (6-8 weeks)
Term
7th Week
Definition
- Notches between digits
- Gut herniation prominent
Term
8th Week
Definition
- Digits Separated
- Heart septation complete
- Purposeful movements
- Distinct human form
- Embryonic period ends
Term
Weeks 9-12
Definition
- ossification occurs
- urine production begins
- intestines return to abdomen
- external genitalia become differentiated
- Permanent tooth buds begin (10 weeks)
Term
Weeks 13-16
Definition
- Much growth in length
- Head more erect
Term
Weeks 17-20
Definition
- Quickening felt
- Vernix caseosa
- Lanuga hair
Term
Weeks 21-25
Definition
- Fetus becomes viable
- doubled in weight
- surfactant production occurs
-Fingerprints present
- Myelination
Term
Weeks 26-29
Definition
- Alveoli become mature
- eyelids open
- breathing movement begins
- body temp control
Term
Weeks 30-34
Definition
- pupillary light reflex (30 weeks)
- fingernail reach finger tips (32 weeks)
- testes descending into scrotum
Term
Weeks 35-38
Definition
- head and abdomen circumference equal
Term
At term
Definition
- Head circumference - 34 cm
- Chest circumference - 30-32 cm
- crown/rump 34 cm and 3400 gm
Term
18 months
Definition
Anterior fontanelle close
Term
6 months
Definition
Posterior fontanelle close
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