Atrophy of paraspinal muscles is common in low back pain (LBP). Early studies report atrophy and abnormalities of the paraspinal muscles in 20% to 60% of people with chronic LBP.More recent data suggest a reduced cross-sectional area of multifidus at L4 and/or L5 in chronic LBP.ntroduction. Atrophy of paraspinal muscles is common in low back pain (LBP). Early studies report atrophy and abnormalities of the paraspinal muscles in 20% to 60% of people with chronic LBP. More recent data suggest a reduced cross-sectional area of multifidus at L4 and/or L5 in chronic LBP.
Hyenas usually bear litters of two to four cubs, which, unlike the other two species, are born with their eyes open. Cubs begin to eat meat from kills near the den at about 5 months, but they are suckled for as long as 12 to 18 months, an unusually long time for carnivores.
Hyenas not only prey on almost any kind of live animal they can catch -- large and small -- but also eat carrion (dead animals), bones, eggs, and even animal droppings. Their powerful jaws enable them to crush even large animal bones. This kind of diet often turns their scat a highly visible, chalky white color.