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.
This transition generally occurs at T11-12, although in elderly patients with osteopenia the transition point generally migrates caudally due to the increased degree of thoracic kyphosis in this population. In the vicinity of the thoracolumbar junction in an adult, the spinal cord terminates as the conus medullaris. Anatomically, this is a dilation of the distal portion of the spinal cord and is the site of transition from the central to peripheral nervous system (cauda equina).