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Related Concept Videos

Cranial Nerves: Overview and Anatomy01:19

Cranial Nerves: Overview and Anatomy

The cranial nerves are an important part of the complex network of nerves in the human body. These nerves emerge directly from the brain and are responsible for transmitting essential information between the brain and various parts of the head and neck. There are 12 pairs of cranial nerves, systematically numbered using Roman numerals from I to XII, beginning from the anterior and moving to the posterior of the brain. Each cranial nerve is uniquely identified by names that reflect its function...
Cranial Nerves: Types Part II01:22

Cranial Nerves: Types Part II

Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves. While the first six innervate the head and neck, the latter six nerves innervate the head and neck, as well as organs and tissues in the thoracic and abdominal cavities. They facilitate communication, expression, and autonomic control within the human body.
Facial Nerve (Cranial Nerve VII)
Cranial nerve VII, or the facial nerve,...
Cranial Nerves: Types Part I01:14

Cranial Nerves: Types Part I

Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves, with the first six being essential in sensory perception, motor control, and autonomic functions related to the head and neck.
Olfactory Nerve (Cranial Nerve I)
The olfactory nerve, or cranial nerve I, is unique as it is purely sensory and dedicated to the sense of smell. This nerve originates in the olfactory epithelium of the...
Cranial Part of Parasympathetic Division01:18

Cranial Part of Parasympathetic Division

The cranial part of the parasympathetic division plays a crucial role in regulating the visceral functions of the head and specific structures in the neck, thoracic, and abdominopelvic cavities. Preganglionic fibers of the parasympathetic division exit the brain through cranial nerves III (oculomotor), VII (facial), IX (glossopharyngeal), and X (vagus), delivering parasympathetic output to the respective visceral structures.
The vagus nerve (cranial nerve X) alone accounts for approximately 75...
Spinal Nerves: Anatomy01:23

Spinal Nerves: Anatomy

Spinal nerves are pivotal conduits in the nervous system, bridging the central nervous system (CNS) with the peripheral nervous system (PNS). These nerves enable a complex communication network between the brain, spinal cord, and the rest of the body, facilitating sensory input, motor output, and autonomic functions.
There are 31 bilateral pairs of spinal nerves, each emerging from the spinal cord through the intervertebral foramina—openings between adjacent vertebrae. These nerves are...
Spinal Nerves: Plexus I01:22

Spinal Nerves: Plexus I

Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...

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Related Experiment Video

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Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer
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The lower cranial nerves: IX, X, XI, XII.

J-L Sarrazin1, F Toulgoat, F Benoudiba

  • 1Service d'imagerie médicale, American Hospital of Paris, 63, boulevard Victor-Hugo, 92200 Neuilly-sur-Seine, France; Service de neuroradiologie, CHU de Bicêtre, 78, rue du Général-Leclerc, 94270 Le Kremlin-Bicêtre, France.

Diagnostic and Interventional Imaging
|August 7, 2013
PubMed
Summary
This summary is machine-generated.

Imaging lower cranial nerves (CN IX-XII) requires clinical context due to subtle symptoms. Lesion location guides MRI/CT protocols for brainstem, cisternal, or foramen pathologies like ischemia, tumors, and infections.

Keywords:
Lower cranial pairsMRIMeningiomaParagangliomaSchwannoma

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In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears
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In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears

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Cancer Borealis Stomatogastric Nervous System Dissection
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Cancer Borealis Stomatogastric Nervous System Dissection

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Area of Science:

  • Neurology
  • Radiology
  • Anatomy

Background:

  • Lower cranial nerves (CN IX-XII) innervate critical head and neck structures.
  • Impairment symptoms are often subtle, necessitating a systematic diagnostic approach.
  • Accurate localization of lesions is key for appropriate imaging selection.

Purpose of the Study:

  • To outline the anatomical pathways and common pathologies affecting the lower cranial nerves.
  • To emphasize the importance of clinical-radiological correlation in diagnosing lower cranial nerve disorders.
  • To guide radiologists in selecting appropriate imaging techniques (MRI/CT) based on suspected lesion location.

Main Methods:

  • Review of anatomical structures and innervation patterns of CN IX-XII.
  • Analysis of common pathologies based on lesion location (brainstem, cisterns, foramens).
  • Discussion of imaging modalities (MRI, CT) and protocol selection.

Main Results:

  • Brainstem pathologies include ischemia (e.g., Wallenberg syndrome) and multiple sclerosis.
  • Cisternal pathologies are predominantly tumors (schwannoma, meningioma).
  • Foramen pathologies include tumors (schwannoma, meningioma, paraganglioma) and less commonly infectious/inflammatory lesions.

Conclusions:

  • Radiologists must master lower cranial nerve anatomy and imaging techniques.
  • Clinical information is crucial for localizing lesions and tailoring imaging protocols.
  • Familiarity with potential pathologies at different anatomical sites aids diagnosis.