Term
|
Definition
- Zygote formation (male and female pronnuclei fuse)
- Zygote immediately divides |
|
|
Term
|
Definition
|
|
Term
|
Definition
- Blastocyst forms
- Enters Uterus
- Zona Pellucida disappears |
|
|
Term
|
Definition
|
|
Term
|
Definition
- Bilaminar Embryo
- 2 parts of trophoblast
- 2 parts of embryoblast
-2 cavities
- 2 membranes
- Establish dorsal/ ventral |
|
|
Term
|
Definition
- Lacunar formation
- implantation nearly complete
- primary yolk sac
- extraembryonic mesoderm forms |
|
|
Term
|
Definition
- Lacunar networks form (maternal/ paternal circulation)
- Decidual Rxn occurs- forms immunologically protected site
- Implantation bleeding. |
|
|
Term
|
Definition
- Extraembryonic membrane begins to split
- Beginning of chorionic cavity |
|
|
Term
|
Definition
- Chorionic cavity forms (3 layers)- form barrier
- primary chorionic villi form |
|
|
Term
|
Definition
- Connecting stalk forms
- prechordal plate forms (location of mouth)
- Secondary yolk sac forms |
|
|
Term
|
Definition
- Trilaminar embryo ( 3 layers)
- migration of cells
- prechordal plate forms mouth |
|
|
Term
|
Definition
- Notochordal process becomes notochord
- Neural tube forms
- mesoderm divides into 3 layers
- lateral plate mesoderm begins to split |
|
|
Term
|
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
|
Definition
| -Closure of anterior neuropore |
|
|
Term
|
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
|
Definition
- Heart begins to beat ( 22-23 days)
- Cardinal and viteline veins develop
- Umbilical artery develops
- Aortic arches develop
- heart tubes develop |
|
|
Term
|
Definition
- Sagittal fold occurs
- three folds form (lateral, head, and tail) (folds continue until day 26?) |
|
|
Term
|
Definition
- Heart begins to beat (22-23 days)
- Folding
- Limb buds
- Pharyngeal arches |
|
|
Term
|
Definition
|
|
Term
|
Definition
- Digital rays
- Spontaneous movement
- Gut herniation begins
- joint formation critical (6-8 weeks) |
|
|
Term
|
Definition
- Notches between digits
- Gut herniation prominent |
|
|
Term
|
Definition
- Digits Separated
- Heart septation complete
- Purposeful movements
- Distinct human form
- Embryonic period ends |
|
|
Term
|
Definition
- ossification occurs
- urine production begins
- intestines return to abdomen
- external genitalia become differentiated
- Permanent tooth buds begin (10 weeks) |
|
|
Term
|
Definition
- Much growth in length
- Head more erect |
|
|
Term
|
Definition
- Quickening felt
- Vernix caseosa
- Lanuga hair |
|
|
Term
|
Definition
- Fetus becomes viable
- doubled in weight
- surfactant production occurs
-Fingerprints present
- Myelination |
|
|
Term
|
Definition
- Alveoli become mature
- eyelids open
- breathing movement begins
- body temp control |
|
|
Term
|
Definition
- pupillary light reflex (30 weeks)
- fingernail reach finger tips (32 weeks)
- testes descending into scrotum |
|
|
Term
|
Definition
| - head and abdomen circumference equal |
|
|
Term
|
Definition
- Head circumference - 34 cm
- Chest circumference - 30-32 cm
- crown/rump 34 cm and 3400 gm |
|
|
Term
|
Definition
| Anterior fontanelle close |
|
|
Term
|
Definition
| Posterior fontanelle close |
|
|
