Intro A Part 2 Flashcards
skeletal muscle attaches to bone via
tendons
appearance of skeletal muscle
striped or striated due to banded pattern of cells
isotonic contraction is
power generated by the muscle is used to lift the manageable weight, and tension in the muscle remains constant –> muscle shortening
isometric contraction is
muscles would be unable to shorten, and the power generated increases the muscle tension instead
Antagonistic pairs
many muscles/muscle groups of the body are arranged so that their actions oppose one another
origin of muscle is
proximal attachment (structure doesn’t move )
insertion of muscle is
distal attachment (generally bone that moves)
what is anisotropy
common artifact seen in the Msk ultrasound
when does anisotropy happen
when US beam encounters structure at non perpendicular angle
What is result of anisotropy artifact
loss of echogenicity of structure
how do we fix anisotropy artifact
heel-toes and fore-aft angulation of probe
where is anisotropy common
in tendons and ligaments
US appearance of tendons
fibrillar pattern of parallel hyperechoic lines in the longitudinal plane and a hyperechoic round-to-ovoid shape in the transverse plane
US appearance of bursa
in a normal joint, the bursa is a thin, black/anechoic line which is less than 2mm thick
distended and enlarged when abnormal
US appearance of peripheral nerves
typically appear as echogenic fascicular structures
and tend to be slightly less echogenic than tendons or ligaments
known for “honey comb appearance”
