BIOL124 Lecture Notes - Lecture 7: Filum Terminale, Conus Medullaris, Anterior Grey Column
Document Summary
Functions: cylinder of nerve fibres: transmit info up/down cns, spinal nerves: info from and to limbs, trunk and organs, protection: meninges and vertebrae. Spinal cord: grey matter: neuronal cell body of axons, neuroglia, unmyelinated fibres, anterior (ventral) horn: somatic motor neuron cell, lateral horn (t1-l2): visceral (autonomic) motor neuron cell, posterior (dorsal) horn: axons of sensory neurons. Spinal cord: white matter: myelinated axons send info up (sensory) and down (motor) the spinal cord, white matter because of the axons and cells. Sensory neuron connected to receptor: cell body in dorsal root ganglion, projects o spinal cord/ or brainstem, secondary (2o) neuron. Interneuron cell body in spinal cord/brainstem: axon crosses the midline (decussates), travels to the contralateral, tertiary (3o) neuron. Interneuron cell body in the thalamus axon travels to primary sensory cortex. Non-conscious sensory pathway: spinocerebellar tract terminates at: cerebellum instead of cortex: 2 neurons instead of 3, does not pass through thalamus, non-conscious proprioception (posture control)
