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 The spinal part of the spinal accessory nerves (N98) emerge from the cervical level of the spinal cord and enter the cranial cavity through the foramen magnum (N8). 2  They may be left intact. 3  Finally, the hypoglossal nerves (N98) and the vertebral arteries (894/N132) are located near the foramen magnum and cut. Associate each with its proper fossa and the foramen it uses to exit the cranial cavity. 2  Carefully remove the true dura from the lateral surface of the trigeminal nerve (fifth cranial nerve) and display the trigeminal (semilunar) ganglion (N98) located in a cave of dura.