KINS 2532 Lecture Notes - Lecture 3: Postganglionic Nerve Fibers, Autonomic Nervous System, Vagus Nerve
Document Summary
Divisions are designed to maintain homeostasis within the body. Therefore, is controls cardiac and smooth muscle glands. Fight or flight: nervousness sometimes work in our benefit in order for us to work optimally. The body reacts by heart rate increasing, blood pressure increasing and pupil dilates: these attributes all come from the: thoracolumbar signals. Sympathetic signals come from thoraces and superior lumbar nerves: central neurons sends signals to the sympathetic chain ganglia (set of 23 ganglia on each side of the spinal cord) Usually from the medulla or the hypothalamus. Ganglia are cell bodies that synapse to organs. Each nerve connects to a central place: ex: heart, stomach. From the spinal cord to sympathetic ganglion. From ganglion to target effector: adrenal medulla. Direct connection from pre-ganglionic fibers to release molecules. Pre-ganglionic fibers can have up to 20 targets: parasympathetic division: Lead to the terminal ganglia which is on or near the target effector. In the wall of the target organ.
