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Related Concept Videos

Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Muscles of the Eye01:20

Muscles of the Eye

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 rotating...
Prosopagnosia01:24

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...
Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
Myasthenia Gravis ll: Pathophysiology01:22

Myasthenia Gravis ll: Pathophysiology

The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
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Cirrhosis I: Introduction

Cirrhosis is a chronic, irreversible liver disease characterized by the widespread replacement of healthy liver tissue with fibrotic scar tissue and the formation of regenerative nodules.Etiology of cirrhosisCirrhosis results from sustained liver injury that triggers progressive fibrosis and structural remodeling. The underlying causes are diverse, encompassing common and less frequent clinical conditions. Regardless of the origin, all causes lead to chronic inflammation, hepatocyte loss, and...

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Related Experiment Videos

Idiopathic isolated orbicularis weakness.

O P MacVie1, M A Majid, H M Husssin

  • 1Department of Ophthalmology, Bristol Eye Hospital, Bristol, UK.

Eye (London, England)
|February 11, 2012
PubMed
Summary
This summary is machine-generated.

Idiopathic isolated orbicularis weakness, a condition affecting eyelid muscles, can cause chronic ocular irritation. Early diagnosis and targeted surgery offer effective symptom relief.

Related Experiment Videos

Area of Science:

  • Ophthalmology
  • Neurology

Background:

  • Orbicularis oculi muscle weakness is often linked to seventh nerve palsy or neuromuscular disorders like myasthenia gravis.
  • Idiopathic isolated orbicularis weakness is less commonly recognized.

Observation:

  • Four female patients presented with chronic ocular irritation and epiphora, some for over 7 years.
  • Symptoms included lagophthalmos and ectropion, with investigations ruling out known causes of orbicularis weakness.
  • Muscle biopsies confirmed orbicularis atrophy in two patients.

Findings:

  • All patients with idiopathic isolated orbicularis weakness experienced symptom alleviation after targeted surgical intervention.
  • This condition may be more prevalent than currently acknowledged.

Implications:

  • Prompt identification of isolated orbicularis weakness is crucial for effective management.
  • Early recognition can prevent misdiagnosis and unnecessary interventions, improving patient outcomes.