Butterflies also act as a lower member of the food chain. They are a hearty meal for a number of animals, including birds and mice. As populations of butterfly diminish, so will populations of birds and other animals that rely on them as a food source.
The conus medullaris (Latin for medullary cone) is the tapered, lower end of the spinal cord.It occurs near lumbar vertebral levels 1 (L1) and 2 (L2), occasionally lower. The upper end of the conus medullaris is usually not well defined.After the spinal cord tapers out, the spinal nerves continue to branch out diagonally, forming the cauda equina.onus medullaris syndrome is a collection of signs and symptoms associated with injury to the conus medullaris. It typically causes back pain and bowel and bladder dysfunction but weakness and sensory loss is uncommon.
1 In the lower part of the back arising from the ilium, sacrum and lumbar spines is the erector spinae muscle (467/N168). 2  It has been divided and subdivided by anatomists, but functionally is one muscle mass causing extension of the vertebral column. Collectively they are designated transversospinal muscles (471/N169). 2  They help extend the vertebral column and rotate the trunk to the opposite side, because they pull the vertebral spine toward the ipsilateral transverse process.