Reproductive Flashcards
(284 cards)
Sonic Hedgehog gene
Zone of polarizing activity at the base of limb buds
Anterior - posterior axis patterning, CNS development
Mutations –> holoprosencephaly
Wnt 7 gene
Apical ectodermal ridge at distal end of each limb
Dorsal-ventral axis patterning, limb development
FGF gene
Apical ectodermal ridge
Limb lengthening
Homeobox genes
segmental organization in cranial-caudal direction, transcription factor coding
Mutations –> appendages in wrong location
Isotretinoin –> increase hox gene expression
Within 1 week fetal development
hCG secretion begins around the time of implantation of blastocyst
Blastocyst sticks at day 6
Within 2 weeks of fetal development
Bilaminar disc (epiblast and hypoblast)
Within week 3 of fetal development
Gastrulation forms trilaminar embryonic disc
Cells from epiblast –> primitive streak –> endoderm, mesoderm, ectoderm
Notochord arises from midline mesoderm
overlying ectoderm –> neural plate
Weeks 3-8 of fetal development
Neural tube formed by neuroectoderm and closes by week 4
Organogenesis
Extremely susceptible to teratogens
Week 4 of fetal development
Heart begins to beat
Upper and lower limb buds begin to form
Week 6 of fetal development
fetal cardiac activity visible by transvaginal US
Week 8 of fetal development
fetal movements start
Week 10 of fetal development
Genitalia have male/female characteristics
Surface ectoderm
epidermis, adenohypophysis, lens of eye, epithelial lining of oral cavity, sensory organs of ear and olfactory epithelium, anal canal below pectinate line, parotid, sweat and mammary glands
Craniopharyngioma
benign Rathke puch tumor with cholesterol crystals, calcifications
Neural Tube
Brain, retina, spinal cord
Neural Crest
Melanocytes, odontoblasts, tracheal cartilage, Enterochromaffin cells, leptomeninges, PNS ganglia, adrenal medulla, schwann cells, spiral membrane, endocardial cushions, skull bones
Mesoderm
muscle, bone, connective tissue, serous lining of body cavities, spleen, CV structures, lymphatics, blood, upper vagina, kidneys, adrenal cortex, dermis, testes, ovaries, microglia
Notochord
nucleus pulposus of intervertebral disc
Endoderm
gut tube epithelium, urethra and lower vagina, luminal epithelial derivatives.
ACEi Teratogen
renal failure, oligohydramnios, hypocalvaria
Alkylating agents Teratogen
absence of digits, multiple anomalies
aminoglycosides Teratogen
ototox
antiepileptic drugs Teratogen
neural tube defects, cardiac defects, cleft palate, skeletal abnormalities
Diethylstilbestrol Teratogen
vaginal clear cell adenocarcinoma, congenital Mullerian anomalies