embryology Flashcards
Learn the timeline of development
1
Q
What happens um the first week of development?(3)
A
- implantation into endometrium begins
- bilaminar embryo forma
- cytithrophoblast and syncytiothrophoblast form
2
Q
What happens in the Second week of development? (4)
A
- aminiotic cavity forma( day 8)
- extraembrionic mesoderma form( day 11)
- connecting stalk form
- prechordal plate forms in bilaminar embryo
3
Q
Whats happens in the third week of development?(5)
A
- primitive steak and bode form in epiblast
- trilaminar embryo forms
- endocardial tubes forms
- neural folds and grooves are present
- primordial germ cells migrate tô genital ridges from yolk sac
4
Q
What happens in the fourth week of development?(8)
A
- neural tubes close
- heart begins beating
- respiratory diverticulum form
- pharyngeal arches 1 and 2 forms
- aortic arch begins forming
- GI gland begins to form from endoderm
- bronchial buds extends os respiratory diverticulum
- septum primum and muscular venticular septum form
5
Q
What happens in the fifth week of development?(6)
A
- facial development begins
- embryo ia completely surrounded by aminiotic sac
- umbilical cord os fully firmes
- cerebral vesicles distinct
- ALL pharyngeal arch present - nasal pt form nasal cavity
6
Q
What happens in the sixth week of development? (7)
A
- midgut herniates to umbilical cord
- pleuropericardial and pleuroperitonial folds begin forming
- oral and nasal cavity confluence
- stomach and duodenum rotate to mature position
- sternal bars form
- atrial septum forms
- urorectal septum forms
7
Q
what happens in the seventh week? (6)
A
- limb cartilages form
- ventricle septum forms
- foramen secundum and foramen ovale form
- external genitalia presente but indifferent
- urogenital sinus ans rectum completely separate
- external ear form
8
Q
what happens in the eight week of development?(3)
A
- facial features distinct
- external genitalia began to distinct
- inner, middle and external ear structures are all present
