脊髓凌树才.pptVIP

Central Nervous System The Spinal Cord脊 髓 The Spinal Cord External features 外形 Internal structure 内部结构 Functions 功能 位置（Location）: foramen magnum → lower border of first lumbar vertebra 8条沟（fissure or sulci): 2个膨大（Enlargements): 颈膨大 cervical enlargement: C4-T1 腰骶膨大 lumbar enlargement: L2-S3 脊髓圆锥 Conus medullaris: 终丝 Filum terminale: 31个节段（Segment): 1. External features: External longitudinal fissure and sulci sulcus fissure Filum terminale Cauda equina anterior lateral anterior median posterior lateral sulcus posterior median sulcus 脊髓节段 Spinal segment Its a part of spinal cord, which is connected with the rootlets of a pair of spinal nerve. 31 segments cervical segments 8 thoracic segments 12 lumbar segments 5 sacral segments 5 coccygeal segments 1 Corresponding relationship between spinal segments and vertebrae spinal segments vertebrae bodies  C1-C4 C1-C4 C5 ~ C8, T l~ T4 C4 ~ T3 T5 ~ T8 T3 ~ T6 T9-T12 T6-T9 L1-L5 T10-T12 S l~S5,Co1 LI? 2. Internal structure Gray matter and central canal 灰质和中央管 White matters 白质 lateral horn posterior horn gray commissure Intermediate zone anterior horn central canal Gray matter Gray matter Parts 分部: Main nuclei 主要核团: Lateral horn 外侧角 (only extends from Tl to L3 segments.) gray commissure 灰质联合 (anterior and posterior ) intermediolateral nucleus Intermediomedial nucleus: the nucleus posteromarginalis the substantia gelatinosa the nucleus proprius the dorsal nucleus (thoracic nucleus) medial group lateral group anterior horn 前角: medial group lateral group intermediate zone 中间带: intermed