3.Types:(1) Physiologic atrophy(2) Pathological atrophy:according to different causes.divided into following types
3. Types: (1) Physiologic atrophy (2) Pathological atrophy: according to different causes, divided into following types
Physiologic atrophy of brainFigure2-5A.Physiologie atrophy of the brain inan 82 year-old male. The meningeshavebeen stripped.B.Normalbrain ofa36-year-old male,AB
Physiologic atrophy of brain
DInsufficient nutritive atrophywhole body: malignant tumorlocal:AS→ brain
① Insufficient nutritive atrophy: whole body: malignant tumor local: AS → brain
Atrophy of disuse:decreased workload → skeletalmuscle fiber decrease in number aswell as in size when a patient isrestricted to complete bed rest.Denervation atrophy:damage to the nerves leads to rapidatrophy of keletal muscle supplied bythose nerves
② Atrophy of disuse: decreased workload → skeletal muscle fiber decrease in number as well as in size when a patient is restricted to complete bed rest. ③ Denervation atrophy: damage to the nerves leads to rapid atrophy of keletal muscle supplied by those nerves
Pressure atrophy:an enlarged tumor can cause atrophy inthe surrounding compressed tissue.Endocrine atrophy:loss of endocrine (estrogen)stimulationatrophy of endometrium, vaginalepithelium and breast
④ Pressure atrophy: an enlarged tumor can cause atrophy in the surrounding compressed tissue. ⑤ Endocrine atrophy: loss of endocrine (estrogen) stimulation atrophy of endometrium, vaginal epithelium and breast