Embryo
Terms
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1st aortic arch
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maxillary artery
1st is MAXimal
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1st branchial cleft
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external auditory meatus, middle ear cavity, eustachian tube, mastoid air cells
- 2nd aortic arch
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stapedial and hyoid
second=stapedial
- 2nd branchial cleft
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epithelial lining of palantine tonsil
- 3rd aortic arch
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common carotid and prox internal carotid
C is 3rd letter of alphabet
- 3rd branchial cleft
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dorsal: inf parathyroids
ventral: thymus
- 4th aortic arch
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left: aortic arch
Right: prox right subclavian
"4 limbs"=systemic
- 4th branchial cleft
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superior parathyroids
- 6th aortic arch
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prox part of pulm arteries and ductus arteriosis
"pulm and pulm to systemic shunt"
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derivation of:
branchial clefts
branchial arches
branchial pouches
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"CAP from outside to inside"
ectoderm
mesoderm
endoderm
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infecctions that cause fetal deafness
infecctions that cause fetal blindness
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CMV, Rubella
syphilis, toxo, varicella
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umbilical arteries become
allantois/urachus becomes
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medial umbilical ligaments
meniaN umbilical ligament
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when does the morula enter the uterus
when does Implantation occur
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day 3
day 6
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ant pit is derived from
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surface ectoderm
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branchial arch 1
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CN 5
mandilbe, malleus, incus
m. of mastication, mylohyoid, tensors, ant bell digastric, ant 2/3 tongue (sensation)
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branchial arch 2
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CN 7
stapes, styloid process, lesser horn hyoid, stylohyoid lig
facial m., stapedius, sylohyoid, post belly digastric
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branchial arch 3
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CN 9
greater horn hyoid
stylopharyngeus
"styloPHARYNGEUS by glossoPHARYNGEAL n."
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branchial arch 4/6
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CN 10
thyroid, cricoid, arytenoid, corniculate, cuneiform
pharyngeal constrictors, levator veli palatini, larynx m.
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cleft lip
- fusion of maxillary and intermaxillary (medial) nasal processes
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cleft palate
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fusion of median palantine processes
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ductus venosus
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shunt from umbilical vein to IVC (oxygenated blood)
bypass liver
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dura matter is derived from
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mesoderm
also serous linings of body cavities, spleen, adrenal cortex, kidneys
- Fetal erythropoesis
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yolk sac 3-8wks
liver 6-30wks
spleen 9-28 wks
marrow 28wks on
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gut tube epithelium
- endoderm
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heart defect in down's
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endocardial cushion defects! Neural crest cell migration
ASD, VSD, PDA
common AV canal (w/ one big AV valve)
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heart defects in Turner's
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left side output problems: bicuspid aortic valve, coarctation, hypoplastic left heart
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neural crest-derived tissues
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ANS, dorsal root ganglia, cranial n., melanocytes, chromaffin cells of adrenal medulla, enterochromoaffin cells, pia dn arachnoid, celiac ganglion, schwann cells, odontoblasts, parafollicular cells, laryngeal cartilage, bones of skull
- parts that make up the diaphragm
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septum transversum, pleuroperitoneal folds, body wall, dorsal mesentery of esophagus
"Several Parts Build Diaphragm"
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post pit is derived from
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neural ectoderm
- postnatal derivative of notochord
- nucleus pulposus
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saturation of umbilical vein blood
- 80%
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tongue arch development and innervation
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ant 2/3: 1st branchial arch, sensory V3, taste VII, motor XII
post 1/3: 3rd and 4th arches, sensory/taste IX (very post part=X), motor XII
- trinucleotide expansion diseases
- huntington's, fragile X, friederich's ataxia, myotonic dystrophy
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umbilical vein becomes
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ligamentum teres of liver
- what type of defect is a VSD
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endocardial cushion (atrioventricular canal defect)
partial defect is ASD
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when do genitalia have male/female characteristics
- wk 10
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when does gastrulation stats
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week 3
mesorderm squishes between epi and hypoblast making the 3 germ cell layers
This starts 2 wks after ovulation! around the time of usual pregnancy!
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when does heart begin to beat
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wk 4
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when is the bilaminar disk formed
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week 2
epiblast and hypoblast