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msk anatomy
| Question | Answer |
|---|---|
| fractured surgical neck of humerus | axillary |
| dislocation of humeral head | axillary |
| fracture at midshaft of humerous | radial |
| saturday night palsy (extended compression of axilla by back of chair or crutches) | radial |
| frature of supracondylar humerous | median |
| patient cannot extend their ring finger (digit 4) or their little finger (digit 5) | ulner nerve lesion with LOF of lumbricals 3 and 4 |
| patient has muscle wasting between the thumb and index finger and cannot spread their fingers | ulnar nerve lesion with loss of interosseous muscle function |
| patient cannot adduct their thumb | ulnar nerve lesion with loss of function of adductor pollicis |
| patient cannot pronate their forarm | median nerve lesion with loss of function of pronator quadratus |
| fracture of medial epicondyle of humerous | ulnar |
| fracture of hamate | ulnar |
| opposition of thumb | median |
| thumb adduction | ulnar |
| adduction and abduction of fingers | interossei |
| osteoblast source of endochondral ossification | mesenchymal stem cells in periosteum |
| endochondral ossification | cartilaginous model of bone is first made by chondrocytes |
| woven bone formed directly without cartilage | membranous ossification |
| flat bone growth | membranous ossifciationl |
| endochondralll | longitduinal bone growth |
| constitutive activation of fibroblast growth factor receptor | inhibits chondrocyte to proliferate -> inhibits chondrocyte proliferation |
| > 85% of mutations occur sporadically and are associated with advanced paternal age, but condition also AD | achondroplasia |
| trabecular spongy bone loses mass and interconnections | osteoporosis |
| normal bone lab values | osteoporosis, osteopetrosis |
| failure of normal bone resorption -> thickenined, dense bones prone to fractuer | osteopetrosis |
| primary spongeiosa fills medullary cavity leading to? | decreased marrow space -> anemia, thrombocytopenia, infection |
| increased extramedullary hematopoiesis related to which bone disease? | osteopetrosis |
| genetic deficiency of carbonic anhydrase II | osteopetrosis |
| x-ray shows erlenmeyer flast bones that flare out |