Questions and Answers
Where do the motor nuclei of some cranial nerves and lateral horn cells of 2nd, 3rd, and 4th sacral segments of the spinal cord belong to?
Parasympathetic nervous system
From where does the oculomotor nerve (III) arise?
Edinger-Westphal nucleus in the midbrain
What do the postganglionic fibers of the oculomotor nerve (III) produce?
Contraction of the constrictor pupillae → narrowing of the pupil
Where do the preganglionic fibers of the facial nerve (VII) that supply the lacrimal and nasal glands relay?
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What is the function of the preganglionic fibers of the facial nerve (VII) that supply the submaxillary gland?
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Study Notes
Cranial Nerve Motor Nuclei
- Motor nuclei of some cranial nerves are located in the brainstem.
- Lateral horn cells of the 2nd, 3rd, and 4th sacral segments of the spinal cord are part of the autonomic nervous system.
Oculomotor Nerve (III)
- The oculomotor nerve arises from the midbrain, specifically the oculomotor nucleus.
Postganglionic Fibers of Oculomotor Nerve
- Postganglionic fibers of the oculomotor nerve lead to ciliary ganglion and are responsible for pupil constriction and lens accommodation.
Facial Nerve (VII) and Preganglionic Fibers
- Preganglionic fibers of the facial nerve supplying lacrimal and nasal glands synapse in the pterygopalatine ganglion.
Function of Facial Nerve Fibers
- Preganglionic fibers of the facial nerve that innervate the submaxillary gland are involved in salivation.
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Description
Test your knowledge of the parasympathetic nervous system with this quiz by Dr. Eman AbdelRaouf. Explore the cranio-sacral outflow, motor nuclei of cranial nerves, and the functions of specific nerves. Sharpen your understanding of the anatomy and function of the parasympathetic nervous system.
