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Questions and Answers
What is the primary functional role of the parasympathetic nervous system?
What is the primary functional role of the parasympathetic nervous system?
- Orchestrating fight-or-flight responses during emergencies.
- Regulating body temperature through sweat gland activation.
- Facilitating anabolic activities and conserving body energy. (correct)
- Managing catabolic processes to provide energy during stress.
Which cranial nerve does NOT carry parasympathetic fibers?
Which cranial nerve does NOT carry parasympathetic fibers?
- Glossopharyngeal (IX)
- Facial (VII)
- Hypoglossal (XII) (correct)
- Oculomotor (III)
Damage to the Edinger-Westphal nucleus would directly affect which parasympathetic function?
Damage to the Edinger-Westphal nucleus would directly affect which parasympathetic function?
- Parotid gland secretion.
- Pupillary constriction. (correct)
- Lacrimal gland secretion.
- Salivary gland secretion.
Following damage to the short ciliary nerves, which function would be impaired?
Following damage to the short ciliary nerves, which function would be impaired?
What type of secretion is produced by the salivary glands under parasympathetic stimulation?
What type of secretion is produced by the salivary glands under parasympathetic stimulation?
Which ganglion is responsible for relaying parasympathetic fibers that innervate the lacrimal gland?
Which ganglion is responsible for relaying parasympathetic fibers that innervate the lacrimal gland?
If a patient exhibits decreased salivation from the parotid gland, which nerve is most likely affected?
If a patient exhibits decreased salivation from the parotid gland, which nerve is most likely affected?
Which of the following is an effect of stimulating the parasympathetic fibers of the facial nerve?
Which of the following is an effect of stimulating the parasympathetic fibers of the facial nerve?
Where do the preganglionic fibers that supply the parotid salivary gland originate?
Where do the preganglionic fibers that supply the parotid salivary gland originate?
Which of the following ganglia is NOT a site where preganglionic parasympathetic fibers synapse?
Which of the following ganglia is NOT a site where preganglionic parasympathetic fibers synapse?
Flashcards
Parasympathetic Nervous System
Parasympathetic Nervous System
Part of the autonomic nervous system that conserves energy and promotes anabolic activities.
Cranio-sacral Division
Cranio-sacral Division
Another name for the parasympathetic nervous system, highlighting its origination from cranial and sacral regions.
Oculomotor Nerve (III)
Oculomotor Nerve (III)
Cranial nerve involved in eye movement; affects pupil contraction (miosis) and lens shape for near vision.
Preganglionic Fibers
Preganglionic Fibers
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Ciliary Ganglion
Ciliary Ganglion
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True Secretion
True Secretion
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Facial Nerve (VII)
Facial Nerve (VII)
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Glossopharyngeal Nerve (IX)
Glossopharyngeal Nerve (IX)
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Otic Ganglion
Otic Ganglion
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Salivary Glands Function
Salivary Glands Function
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Study Notes
Parasympathetic Nervous System
- The parasympathetic nervous system is a part of the autonomic nervous system involved in anabolic activities.
- It plays a role in conserving the body's energy supply.
- It is also known as the cranio-sacral division due to its origins.
Parasympathetic Nervous System Division
- Divided into two components:
- Cranial outflow: Fibers in cranial nerves III (oculomotor), VII (facial), IX (glossopharyngeal), and X (vagus)
- Sacral outflow: Fibers arising from segments 2, 3, and 4 of the sacral spinal cord.
Oculomotor Nerve (CN III)
- Originates from the Edinger-Westphal nucleus in the midbrain.
- Preganglionic fibers synapse in the ciliary ganglion.
- Postganglionic fibers travel in short ciliary nerves.
- Functions:
- Miosis: Contraction of the constrictor pupillae muscle results in pupil constriction.
- Accommodation: Contraction of the ciliary muscle relaxes suspensory ligaments, increasing lens curvature for near vision.
Facial Nerve (CN VII)
- Supplies the lacrimal, nasal, and submandibular salivary glands.
- Preganglionic fibers originate from the superior salivatory nucleus in the pons.
- Fibers to the lacrimal and nasal glands synapse in the sphenopalatine ganglion.
- Fibers to the submandibular gland synapse in the submandibular ganglion.
- Function:
- True secretion: Produces watery saliva with low enzyme concentration.
- Vasodilation: Promotes blood vessel expansion.
Glossopharyngeal Nerve (CN IX)
- Supplies the parotid salivary gland.
- Preganglionic fibers arise from the inferior salivatory nucleus and synapse in the otic ganglion.
- Functions:
- True secretion: Produces watery saliva with low enzyme concentration.
- Vasodilation: Promotes blood vessel expansion.
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Description
The parasympathetic nervous system is a part of the autonomic nervous system involved in anabolic activities and energy conservation. It consists of cranial and sacral outflow. Cranial outflow includes fibers from cranial nerves III, VII, IX and X, while Sacral outflow originates from the sacral spinal cord.
