Blagovechtchenski E, Pettersson L G, Perfiliev S, Krasnochokova E, Lundberg A
Department of Physiology, Göteborg University, Sweden.
Neurosci Res. 2000 Sep;38(1):103-7. doi: 10.1016/s0168-0102(00)00147-4.
C3-C4 propriospinal neurones (C3-C4 PNs) transmit the command for forelimb target-reaching in cats, while the command for food-taking is mediated by interneurones in the forelimb segments. The ability of the C3-C4 PNs to control digits has now been reinvestigated with combined lesions in dorsal C5 (transecting the cortico- and rubrospinal tracts) and ventral C2 (transecting reticulospinal tracts) leaving the C3-C4 PNs in sole control of the forelimb. Components of food-taking like flexion in the proximal interphalangeal joints were found in half of the cats. Supination and terminal flexion of the metacarpophalangeal joints by which normal cats bring the morsel of food to the mouth were lacking in all cats.
颈3-颈4脊髓固有神经元（C3-C4 PNs）传递猫前肢目标够取的指令，而取食指令则由前肢节段中的中间神经元介导。现在，通过联合损伤颈5背侧（切断皮质脊髓束和红核脊髓束）和颈2腹侧（切断网状脊髓束），使C3-C4 PNs单独控制前肢，重新研究了C3-C4 PNs控制手指的能力。在一半的猫中发现了取食动作的组成部分，如近端指间关节的屈曲。所有猫都缺乏正常猫将食物送到嘴边时所具有的掌指关节旋后和终末屈曲动作。
