BSC 109 Lecture Notes - Lecture 23: Dura Mater, Pia Mater, Spinal Nerve
11 Oct 2016
School
Department
Course
Professor
Document Summary
Response of postsynaptic target cell depends on: Depolarize the postsynaptic cell, approaching or exceeding threshold. How many neurons are forming synapses with it. Whether the neurons forming synapses with it are excitatory or inhibitory. Convergence: occurs when one neuron receives input from many others. Divergence: occurs when one neuron sends action potentials to multiple other neurons. Peripheral nervous system relays information between tissues and cns. Contains axons of many neurons wrapped together in a protective sheath. Carries information to and from the cns. Provide information for both the somatic and autonomic motor divisions of the pns. Incoming information arrives at the cns as action potentials from sensory neurons located throughout the body. Voluntary: conscious control of skeletal muscles. Involuntary (reflexes: spinal reflexes: involuntary responses mediated primarily by spinal cord and spinal nerves, with little brain involvement, flexor (withdrawal) reflex, crosses extensor reflex, stretch reflex: important in maintaining upright posture, movement. Part of the motor output of the pns.
