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USMLE Extra

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thenewmaster's version from 2016-06-05 15:41

Embryology

Pharyngeal/Aortic ArchKey DerivativeType of DerivativeNumber
1Meckel's cartilage (mandible/Malleus/Incus/Sphenomandibular ligament)Branchial arch cartilage4 M
2Reichert's cartilage (stapes/styloid process/lesser horn of hyoid/stylohyoid ligament)Branchial arch cartilage4 S
1Mastication (teMporalis/Masseter/lateral/Medial pterygoids)/Mylohyoid/anterior digastric/tensor tympani/tensor veli palatiniBranchial arch muscles8 M
2Facial expression/Stapedius/Stylohyoid/posterior digastricBranchial arch muscles4 S
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MI Healing

TimeProcess
0-4hMinimal change
4-12hEarly coagulation necrosis/edema/hemorrhage/wavy fibers. reperfusion injury
12-24hCoagulation necrosis/marginal contraction band necrosis
1-3dCoagulation necrosis/neutrophilic infiltrate
3-14dMacrophage phagocytosis of dead cells, Granulation tissue/neovascularization
2w-2mCollagen deposition/scar formation
0-24h Cxventricular arrhythmia, HF, cardiogenic shock
1-3 days Cxpostinfarction fibrinous pericarditis
3-14 days CxRupture - Papillary muscle rupture (MR), septal rupture (VSD), wall rupture (cardiac tamponade), LV pseudoanerysm
2 wks to months CxDresslr syndrome, true ventricular aneurysm, HF, arrhythmia
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