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Questions and Answers
The parasympathetic nervous system deals with ______ activities and conserves body energy.
The parasympathetic nervous system deals with ______ activities and conserves body energy.
anabolic
The parasympathetic nervous system is also known as the ______ division due to its origin.
The parasympathetic nervous system is also known as the ______ division due to its origin.
cranio-sacral
Parasympathetic fibers are found in cranial nerves III, VII, ______, and X.
Parasympathetic fibers are found in cranial nerves III, VII, ______, and X.
IX
Parasympathetic sacral outflow arises from the lateral horn cells (LHCs) of sacral segments ______, 3, & 4 of the spinal cord.
Parasympathetic sacral outflow arises from the lateral horn cells (LHCs) of sacral segments ______, 3, & 4 of the spinal cord.
The preganglionic fibers of the oculomotor nerve relay in the ______ ganglion.
The preganglionic fibers of the oculomotor nerve relay in the ______ ganglion.
Contraction of the constrictor pupillae muscle leads to ______ of the pupil.
Contraction of the constrictor pupillae muscle leads to ______ of the pupil.
The facial nerve (VII) supplies the lacrimal, nasal, and ______ salivary glands.
The facial nerve (VII) supplies the lacrimal, nasal, and ______ salivary glands.
Fibers that supply the lacrimal and nasal glands relay in the ______ ganglion.
Fibers that supply the lacrimal and nasal glands relay in the ______ ganglion.
The glossopharyngeal nerve (IX) supplies the ______ salivary gland.
The glossopharyngeal nerve (IX) supplies the ______ salivary gland.
Preganglionic fibers of the glossopharyngeal nerve arise from the ______ salivary nucleus in the medulla.
Preganglionic fibers of the glossopharyngeal nerve arise from the ______ salivary nucleus in the medulla.
Flashcards
Parasympathetic Nervous System
Parasympathetic Nervous System
Part of the autonomic nervous system focused on energy conservation and anabolic activities.
Cranial Outflow
Cranial Outflow
Parasympathetic fibers originating from cranial nerves III, VII, IX, and X.
Sacral Outflow
Sacral Outflow
Parasympathetic fibers arising from S2, S3, and S4 segments of the spinal cord.
Oculomotor Nerve (III)
Oculomotor Nerve (III)
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Constrictor Pupillae Muscle
Constrictor Pupillae Muscle
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Facial Nerve (VII)
Facial Nerve (VII)
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True Secretion
True Secretion
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Glossopharyngeal Nerve (IX)
Glossopharyngeal Nerve (IX)
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Salivary Glands
Salivary Glands
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Vasodilation
Vasodilation
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Study Notes
Parasympathetic Nervous System
- Part of the autonomic nervous system
- Deals with anabolic activities
- Leads to conservation of body energy
- Also known as the cranio-sacral division
Divisions of the Parasympathetic Nervous System
-
Cranial outflow:
- Parasympathetic fibers are found in cranial nerves III (oculomotor), VII (facial), IX (glossopharyngeal), and X (vagus).
-
Sacral outflow:
- Parasympathetic fibers originate from segments 2, 3, and 4 of the sacral spinal cord.
Oculomotor Nerve (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:
- Constriction of the pupil (miosis): Contraction of the constrictor pupillae muscle.
- Focusing the eye (accommodation): Contraction of the ciliary muscle, leading to relaxation of suspensory ligaments and increased lens convexity.
Facial Nerve (VII)
- Supplies the lacrimal, nasal, and submandibular salivary glands.
- Preganglionic fibers originate in the superior salivatory nucleus in the pons.
- Fibers for lacrimal and nasal glands synapse in the sphenopalatine ganglion.
- Fibers for submandibular glands synapse in the submandibular ganglion.
- Functions:
- True secretion (large volume, watery saliva, less enzyme content)
- Vasodilation in the salivary glands
Glossopharyngeal Nerve (IX)
- Supplies the parotid salivary gland
- Preganglionic fibers originate in the inferior salivatory nucleus in the medulla
- Synapse in the otic ganglion
- Functions:
- True secretion (large volume, watery saliva, less enzyme content)
- Vasodilation of blood vessels
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Description
Overview of the parasympathetic nervous system, its cranial and sacral divisions, and the functions of the oculomotor nerve (III), including pupil constriction and eye focusing. The system conserves body energy and is also known as the cranio-sacral division.
