ANAT30008 Lecture Notes - Lecture 27: Superior Hypogastric Plexus, Parasympathetic Ganglion, Dorsal Root Ganglion
16 Oct 2018
School
Department
Course
Professor
Document Summary
Lecture 27 neuroanatomy of the pelvic viscera. Thousands of autonomic neurons are embedded within this plexus and highly vulnerable to surgical injury. Note: sympathetic and parasympathetic nervous systems are de ned by their anatomy, speci cally the location of their pre-ganglionic neuron origins i. e. sympathetic = thoracolumbar, parasympathetic = craniosacral. Sympathetic ganglia are generally more distant from organs (sympathetic trunk) Parasympathetic ganglia are generally closer to or within organs (form aggregates) Sympathetic and parasympathetic axons look the same, but: usually have di erent neurotransmitters, usually di er in their pattern and density of tissue innervation. In contrast to skeletal muscle: no easily visible synaptic junctions, more than one neurotransmitter release site per axon. Primary functions of autonomic neurons in the ihp. Sympathetic: bladder = continence (contraction of bladder base, reproductive organs. Emission/ejaculation contraction of smooth muscle in prostate gland, seminal vesicles, vas deferens, urethra. Detumescence of erectile tissue: lower bowel = continence.
