embryology mini 3

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Author:
sweetlu
ID:
116000
Filename:
embryology mini 3
Updated:
2011-12-03 15:19:11
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embryo
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e m 3
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  1. AA-1
    (internal) maxillary a.
  2. AA-2
    • stapedial a.
    • -should be gone by birth
    • - if persistent - middle ear abnormalities
  3. AA-3
    • -common carotid a.s
    • -caudal portion of the internal carotid (rest of the internal carotid arises from the dorsal aorta
  4. AA-4
    • L side- aortic arch
    • R side- proximal right subclavian (distal portion from 7th intersegmental a
  5. AA-6
    • L- ductus arteriosus (shunt from pulm. a. to aorta), some of left pulmonary a
    • R- right pulmonary artery
  6. Left sinus horn
    forms coronary sinus and left oblique vein of left atrium
  7. Left umbilical, vitilene and cardinal veins
    obliterated
  8. right sinus horn
    • forms sinus venarum
    • (smooth part of right ventricle)
  9. embryological shunts
    1. ductus venosus- umbilical v. partial bypass of liver (becomes ligamentum venosum)

    2. foramen ovale- RA to LA shunt (become fossa ovale)

    3. ductus arteriosus- pulmonary to aortic arch (become ligamentum arteriosum)
  10. bulbus cordis
    • forms conus arteriosis of RV
    • forms aortic vestibule of LV
  11. formation of this requires neural crest cells
    aorticopulmonary cleft
  12. pseudogladular period
    • - weeks 5-16
    • - branching has continued to form terminal bronchioles
    • - no respiratory bronchioles or alveoli
  13. canalicular period
    • - weeks 16-26
    • - 2 or more respiratory bronchioles formed, which form 3-6 alveolar ducts
  14. terminal sac period
    • - weeks 26-birth
    • - cuboidal cells in respiratory bronchioles turn into squamous
    • - terminal sacs or primitive alveoli present
    • - respiration possible
  15. 24 weeks (end of month 6)
    • - type 2 pneumocytes first appear and begin to secrete surfactant
    • - adequate amount of surfactant by week 35
  16. when are there sufficient numer of capillaries to gaurantee adequate gas exchange
    month 7
  17. alveolar period
    6
    • - month 8 to childhood
    • - steady increase in the number of terminal sacs
    • - blood- air barrier
    • - mature alveoli only appear after birth
    • - surfactand increases greatly last 2 weeks in utero
    • - 1/6 of adult number of alveoli
  18. SVC origin
    R anterior cardinal and R common cardinal
  19. vitelline artery derivatives
    • -celiac artery
    • - superior mesenteric artery
    • - inferior mesenteric artery
  20. hepatic sinusoids origin
    vitelline veins
  21. umbilical artery derivatives
    • - internal iliac arteries
    • -connected to 5th pair of lumbar intersegmental arteries
  22. common iliac artery origin
    - 5th intersegmental artery
  23. medial umbilical ligaments origin
    -distal parts of the umbilical arteries
  24. superior vesicle artery origin
    proximal portions of umbilical arteries
  25. vitelline vein derivatives
    • - portal vein
    • - hepatic portion of IVC
  26. umbilical vein fate
    • - right is completely obliterated
    • - left becomes round ligament of liver(ligamentum teres)
    • - ductus venosus becomes th ligamentum venosum
  27. left brachilcephalic vein origin
    common cardinal vein
  28. posterior cardinal vein fate
    • - root of azygous vein and common iliac vein
    • - supra and subcardinal veins take over the job of posterior cardinal v and drain body wall
  29. IVC formation
    • - hepatic- R vitelline vein
    • - prerenal- R subcardinal
    • - renal- subcardinal- supracardinal anastamoses
    • - postrenal- R supracardinal v.
  30. SVC formation
    - R common cardinal and R anterior cardinal

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