BSC-2085 Lecture 17: anatomy exam 4
Document Summary
Lesson 17 - the spinal cord and spinal nerves. Bilateral symmetry - gray matter surrounded by white matter. Grooves divide spine into left & right. Anterior median fissure - deeper groove on anterior side. Of gray matter in segment (more gray mat. Since more cells in these areas) - involved w sensory and motor nerves of limbs. Cervical enlargement - nerves of shoulders and upper limbs (around c6 level) Lumbar enlargement - nerves of pelvis & lower limbs (around t11 level) Conus medullaris - thin, conical cord below lumbar enlargment. Filium terminale - thin thread of fibrous tissue at end of conus medullaris, attaches to coccygeal ligament, provides longitudinal support to spine. Cauda equina - nerve roots (ventral and dorsal) extending below conus medullaris and into sacrum. Based on vertebrae where spinal nerves originate. Positions of spinal segment & vertebrae change with age (as vertebral column grows, dorsal & ventral roots elongate)
