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Cranial Nerves: Types Part II

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 I

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...

Prosopagnosia

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...

Spinal Nerves: Plexus I

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...

Spinal Nerves: Plexus II

Spinal Nerves: Plexus II

The plexuses of the lower body include the lumbar, sacral, and coccygeal plexuses, which innervate the abdomen, pelvis, legs, and coccygeal region. These plexuses control the transmission of sensory information and coordinate motor functions of the lower body.
The Lumbar Plexus
The lumbar plexus is situated within the lumbar region of the back and is primarily formed by the first four lumbar spinal nerves (L1 to L4). This plexus extends its branches into several nerves, including the...

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Related Experiment Video

Updated: Jun 10, 2026

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

Published on: March 1, 2015

Photo essay. Isolated fascicular third nerve palsy.

Valerie Purvin¹

¹Midwest Eye Institute, Indianapolis, Indiana University Medical Center, Indiana 46290, USA. vpurvin@iupui.edu

Journal of Neuro-Ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society

|August 21, 2010

Summary

This summary is machine-generated.

A stroke in the brainstem caused a partial third nerve palsy in a hypertensive woman, leading to double vision and eyelid drooping. This case supports the theory that specific nerve pathways in the brainstem control eye movements.

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Last Updated: Jun 10, 2026

Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer

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Partial Optic Nerve Transection in Rats: A Model Established with a New Operative Approach to Assess Secondary Degeneration of Retinal Ganglion Cells

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Published on: October 15, 2017

Area of Science:

Neuroscience
Neurology
Ophthalmology

Background:

The oculomotor nerve (cranial nerve III) controls most eye movements, including eyelid elevation, and pupillary constriction.
Understanding the precise topographic organization of the third nerve fascicles within the brainstem is crucial for localizing lesions.

Observation:

A 72-year-old hypertensive woman presented with acute diplopia and right upper lid ptosis.
Clinical examination revealed a partial right third nerve palsy characterized by complete ptosis, impaired adduction and supraduction, but spared infraduction and the pupil.
No other neurological deficits were observed.

Findings:

Brain MRI with diffusion-weighted imaging identified an infarct in the right paramedian midbrain tegmentum.
The infarct's location corresponded to the expected course of the third nerve fascicles.

Implications:

This case provides further evidence for a specific topographic organization of the third nerve fascicles within the brainstem.
Such detailed anatomical knowledge aids in the accurate diagnosis and localization of neurological deficits affecting eye movement and eyelid function.
This supports the use of advanced neuroimaging in correlating clinical presentation with specific neuroanatomical structures.