Autonomic Nervous System PDF
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Prof MT
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Summary
These notes provide an overview of the parasympathetic nervous system, focusing on the cranial nerves involved and the associated ganglia. The document includes questions for further study. The information is relevant for understanding the workings of the autonomic system, including its role in pupil dilation and glandular function.
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PARASYMPATHETICS Prof Dr MT AUTONOMIC NERVOUS SYSTEM Adapta8on of an organism’s internal state to changes in the environment without conscious effort innervates smooth muscle, cardiac...
PARASYMPATHETICS Prof Dr MT AUTONOMIC NERVOUS SYSTEM Adapta8on of an organism’s internal state to changes in the environment without conscious effort innervates smooth muscle, cardiac muscle, glands; also carries the GVA fibers from viscera, blood vessels and glands to central nervous system. ANS is a two neuron pathway: 1) pre-‐ganglionic neurons have their cell bodies located in the CNS 2) post-‐ganglionic neurons have their cell bodies located in peripheral ganglia. Parasympathetics restful or energy conserving division- “rest and digest” Sympathetics attentive state in which one is able to “fight and flight” CRANIAL PARASYMPATHETICS III, VII, IX, X OCULOMOTOR NERVE (ciliary ganglion>pupilla) FACIAL NERVE (pterygopala8ne&submandibular ganglia>lacrimal gland, submandibular and sublingual glands) GLOSSOPHARYNGEAL NERVE (o8c ganglion>paro8d gland) VAGUS NERVE (intramural ganglia>all the organs up to leY colic flexure of the large intes8nes) OCULOMOTOR NERVE CILIARY GANGLION Oculomotor N FACIAL NERVE Branches of Facial Nerve in the Facial Canal 1. Greater petrosal n Preganglionic parasymp fibers to lacrimal, nasal, and palatal glands (postgang fibers carried by the zygomatic n of V2) 2. Chorda tympani Preganglionic parasymp fibers to submandibular and sublingual glands Special Visceral Afferents from the taste buds 3. Nerve to stapedius GANGLIA RELATED TO FACIAL NERVE PTERYGOPALATINE GANGLION SUBMANDIBULAR GANGLION PSG SSG MR GLOSSOPHARYNGEAL NERVE OTIC GANGLION-‐ Glossopharyngeal Nerve Lesser petrosal nerve (given off by the tympanic plexus-of CNIX as its psps component) emerges the skull from the oval foramen and makes synapses at the otic ganglion. Postsynaptic fibers are carried in the auriculotemporal br of the V3 to the parotid gland Medial and lateral views Sensory: skin of the external acoustic meatus and mucosa of laryngopharynx and larynx. GVA to the heart and abdominal viscera Special Sensory: Taste sensation to the tongue Motor: Provides motor innervation to the majority of the muscles of the pharynx, soft palate and larynx Parasympathetic division: Innervates the smooth muscle of the trachea, bronchi and gastro- intestinal tract (up to the distal 1/3rd of transverse colon), regulates heart rhythm and provides visceral sensation to the organ Vagus Nerve SACRAL PARASYMPATHETICS (Nervi erigentes) S2-S4 innervate the area starting the distal 1/3rd of transverse colon all the way down http://www.slideshare.net/Mohammad-Hadi-Farjoo/introduction-to-autonomic-pharmacology http://www.slideshare.net/Mohammad-Hadi-Farjoo/introduction-to-autonomic-pharmacology http://www.slideshare.net/Mohammad-Hadi-Farjoo/introduction-to-autonomic-pharmacology -PSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPS What type of fibers are forming the cranial nerves? Which of them are conveying parasympathetic (PS) fibers? Which of the cranial nerve is related to the otic ganglion? Which of the cranial nerve is formed by all GSA, GSE, and GVE fibers? What happens if the short ciliary nerves get damaged? Where is the pterygopalatine ganglion? Which nerve synapse at the otic ganglion? Which nerve innervates the lacrimal gland? Which nerve gives ride to the facial nerve to innervate tongue (related to the SSA) What is the relation of the parotid gland and the mandibular nerve? What is the relation of the parotid gland and the middle ear? Does facial nerve go all the way to the lacrimal gland? Which of the ganglions related to the submandibular and sublingual glands? Is there any connection between the nerves innervating the parotid gland and the nerve/s innervating the submandibular and sublingual glands? What happens if you don’t learn anatomy well :D Which of the cranial nerves conveying PS fibers also carries SSA fibers? Which of the cranial nerves conveying PS fibers also carries GSE fibers? Which of the PS ganglia is located within the infratemporal fossa? Where is ciliary ganglion? Where are you?
