BIO310H5 Study Guide - Midterm Guide: Neuropil, Spinal Cord, Startle Response
Document Summary
Sensory neurons convey signals about environmental stimuli to the cns. > these signals are integrated by cns neurons & can trigger/modulate output signals of motor neurons to control effectors such as contracting muscle cells. More complex ns show centralization (ie. central & peripheral ns) See groups of interconnected neuronal cells into ganglia. In many species, ganglia grouped together at the anterior end form an integrating center (the brain) Ganglion (seen in cs), contains an outer rind of cell bodies & an inner core of synaptic neuropil & of axons. Spinal cord is a site of reflex action that can act independently from the brain but can also receive input from higher centers in the brain. Each spinal segment of vertebrate ns receives info from & controls movements in a defined region of the body. Interneurons (cell bodies & axons) determine whether the incoming stimulus is worth a specific response (related to stimulus strength)
