Embryology Flashcards
The three germinal layers are
- endoderm
- mesoderm
- ectoderm (nerves and skin)
Endoderm derivatives are
- gut
- respiratory tract
- tubular structures
Mesoderm layer is composed of 4 subgroups..
- paraxial
- intermediate
- head
- lateral plate
Paraxial gives rise to
somites 31 pairs
Intermediate gives rise to
kidneys
Head gives rise to
skull, muscles, ad CT of head and DENTINE
Lateral plate gives rise to
ADRENAL CORTEX, SPLEEN, blood lymph serous membranes
Ectoderm gives rise to 2 subgroups
- surface
- neuroectoderm - 1. neural tube 2. neural crest
Surface ectoderm gives rise to
ANTERIOR PITUITARY and LENS OF EYE
enamel, hair, and nails
Neural tube gives rise to
POST PITUITARY and RETINA of eye
Neural crest gives rise to
DRG, ANS, PARAFOLLICULAR CELLS OF THYROID, ADRENA MEDULLA
3 Stages of embryological development
- mesodermal
- chondrification
- ossification
chondrification is __ being replaced by __
mesoderm being replaced by cartilage
ossification is __ being replaced by __
cartilage being replaced by bone
1* ossification = __ birth
2 * ossification = __ birth
BEFORE 1
AFTER 2
