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Related Concept Videos

Cranial Nerves: Types Part I01:14

Cranial Nerves: Types Part I

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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...
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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
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Cranial Part of Parasympathetic Division01:18

Cranial Part of Parasympathetic Division

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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...
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Cranial Nerves: Types Part II01:22

Cranial Nerves: Types Part II

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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.
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Cranial nerve VII, or the facial nerve,...
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Muscles of the Eye01:20

Muscles of the Eye

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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
Extraocular Muscles
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and...
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Cranial and Spinal Meninges01:19

Cranial and Spinal Meninges

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The cranial and spinal meninges are complex protective structures surrounding the central nervous system (CNS), consisting of the brain and spinal cord. These meninges consist of the dura mater, the arachnoid mater, and the pia mater. They protect the CNS, provide structural support, and aid in circulating cerebrospinal fluid (CSF).
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These meningeal layers cover the cranium. The dura mater is the outermost layer of cranial meninges. It is a thick and durable membrane of dense...
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Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas
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Sphenoid mucopyocele causing bilateral sixth nerve palsy.

Mairead Kelly, Liisa Chang, Parag Patel

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    Sphenoid mucoceles are rare but can cause serious symptoms like eye paralysis. Early diagnosis and surgical drainage are crucial to prevent permanent complications.

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    Area of Science:

    • Neurology
    • Ophthalmology
    • Otorhinolaryngology

    Background:

    • Sphenoid mucoceles are rare cystic masses that can compress adjacent neurovascular structures.
    • Symptoms include headache, visual disturbances, and cranial nerve palsies, necessitating prompt diagnosis.

    Observation:

    • A case of a patient presenting with bilateral abducens nerve palsies is described.
    • Surgical exploration revealed a sphenoid mucopyocele, which was subsequently drained.

    Findings:

    • This is the first reported case of a sphenoid mucocele causing bilateral abducens nerve palsies.
    • The patient required prolonged antibiotic therapy due to persistent symptoms and dural enhancement on imaging.

    Implications:

    • Early recognition and surgical intervention for sphenoid mucoceles are vital to prevent permanent neurological deficits.
    • A multidisciplinary team approach involving ophthalmology, ENT, radiology, neurology, and neurosurgery is essential for optimal patient management.