RSL - Repro - Embryology Flashcards
Sonic Hedgehog gene: Production
at base of limbs
Sonic Hedgehog gene: action
Patterning along anterior to posterior axis
Wnt-7 gene: production
At apical ectodermal ridge
Wnt-7 gene: action
Patterning along Dorsal-ventral axis
FGF gene: production
Apical ectodermal ridge
FGF gene: Action
Stimulates mitosis of underlying mesoderm –> lengthening of limb
Homeobox (Hox) genes: action
Segmentation of embryo in Craniocaudal direction. (mutations –> appendages in wrong locations)
HCG and implantation of blastocyst: Week _
1
Bilaminar disk (epiblast, hypoblast): Week _
2
Gastrulation: Week _
3
Neural tube formation: week _
4
Extremely sensitive to teratogens: Weeks _
4-8
Heart beats: week _
4
4 limbs: week_
4
Genetalia: week_
10
Embyologic origins: Lens of eye
Surface ectoderm
Embyologic origins: Sensory organs of ear
Surface ectoderm
Embyologic origins: Anal canal below pectinate line
Surface ectoderm
Embyologic origins: Oral cavity
Surface ectoderm
Embyologic origins: Parotid, sweat, mammary glands
Surface ectoderm
Embyologic origins: Oligodendrocytes
Neuroectoderm
Embyologic origins: PNS
Neural crest
Embyologic origins: Shwann cells
Neural crest
Embyologic origins: Melanocytes
Neural crest