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MORPHOLOGY OF THE TEMPOROMANDIBULAR JOINT: STRUCTURE AND
FUNCTION
Axmedova Malika Qilichovna
Asian International University.
Bukhara, Uzbekistan
Email:
malikaaxmedova855@gmail.com.
https://doi.org/10.5281/zenodo.15013019
Abstract.
The temporomandibular joint (TMJ) is one of the most complex and unique
joints in the human div. It connects the mandible (lower jaw) to the temporal bone of the skull,
allowing movements essential for chewing, speaking, and facial expressions. The morphology of
the TMJ is distinct from other synovial joints due to its articulation with a fibrocartilaginous disc
and its ability to perform both hinge and gliding motions. This article provides an in-depth
analysis of the morphology of the TMJ, highlighting its structural components and functional
significance.
Key words:
temporomandibular joint, ligament,
joint capsule, mandible,
muscles
associated.
МОРФОЛОГИЯ ВИСОЧНО-НИЖНЕЧЕЛЮСТНОГО СУСТАВА: СТРУКТУРА И
ФУНКЦИЯ
Аннотация.
Височно-нижнечелюстной сустав (ВНЧС) является одним из самых
сложных и уникальных суставов в организме человека. Он соединяет нижнюю челюсть с
височной костью черепа, обеспечивая движения, необходимые для жевания, речи и
выражения лица. Морфология ВНЧС отличается от других синовиальных суставов
благодаря его сочленению с фиброзно-хрящевым диском и его способности выполнять как
шарнирные, так и скользящие движения. В этой статье представлен углубленный анализ
морфологии ВНЧС, с акцентом на его структурные компоненты и функциональное
значение.
Ключевые слова:
височно-нижнечелюстной сустав, связка, суставная капсула,
нижняя челюсть, связанные мышцы.
The TMJ comprises several key anatomical structures that contribute to its function:
1. Articular Surfaces
The TMJ is formed by the articulation of the mandibular condyle and the mandibular
fossa of the temporal bone. These surfaces are covered with fibrocartilage rather than hyaline
cartilage, which is more common in synovial joints. The fibrocartilage provides increased
resistance to mechanical stress and better regenerative properties.
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Mandibular Condyle
: The condyle is elliptical in shape and varies in size among
individuals. It articulates with the temporal bone to facilitate jaw movements.
Temporal Bone (Mandibular Fossa and Articular Eminence)
: The mandibular fossa
forms the superior portion of the TMJ, while the articular eminence acts as a guiding surface
during jaw movements.
2. Articular Disc
A critical component of the TMJ is the articular disc, a fibrocartilaginous structure that
divides the joint cavity into upper and lower compartments. This disc plays a crucial role in
cushioning mechanical forces and ensuring smooth articulation.
Anterior Band
: The thickest part of the disc that maintains stability.
Intermediate Zone
: The thinnest part that allows smooth gliding of the condyle.
Posterior Band
: Attached to the retrodiscal tissue and provides support to the disc.
3. Joint Capsule and Ligaments
The TMJ is enclosed by a fibrous joint capsule that stabilizes and protects the joint.
Several ligaments provide additional support:
Temporomandibular Ligament
: Reinforces the lateral aspect of the joint and limits
excessive movement.
Sphenomandibular Ligament
: Connects the sphenoid bone to the mandible, assisting in
jaw suspension.
Stylomandibular Ligament
: Extends from the styloid process to the mandible,
preventing excessive protrusion of the jaw.
4. Muscles Associated with the TMJ
The TMJ is primarily controlled by the muscles of mastication, which facilitate jaw
movement:
Masseter
: Provides strong elevation of the mandible.
Temporalis
: Elevates and retracts the mandible.
Medial Pterygoid
: Assists in jaw elevation and side-to-side movements.
Lateral Pterygoid
: Controls jaw depression and protrusion.
Functional Morphology and Movements
The TMJ enables a combination of hinge (rotation) and gliding (translation) movements,
making it a bicondylar joint. The primary movements include:
Opening and Closing (Hinge Movement)
: The initial phase of mouth opening involves
rotation of the condyle within the mandibular fossa.
Protrusion and Retrusion (Gliding Movement)
: The mandibular condyle moves
forward and backward along the articular eminence.
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Lateral Excursion (Side-to-Side Movement)
: The jaw shifts from side to side, allowing
for efficient mastication.
Developmental and Evolutionary Aspects
The morphology of the TMJ evolves throughout an individual's lifespan. During infancy,
the joint is underdeveloped, with increased mobility. As mastication patterns change with age,
the TMJ has adapted to different dietary habits in mammals, with herbivores exhibiting a more
pronounced articular eminence for grinding motions, while carnivores have a more constrained
hinge mechanism for biting efficiency.
Clinical Implications
TMJ disorders (TMD) arise due to various morphological and functional abnormalities,
leading to pain, restricted movement, and joint noises. Some common conditions include:
Disc Displacement
: Misalignment of the articular disc resulting in clicking or locking of
the jaw.
Osteoarthritis
: Degeneration of joint surfaces leading to pain and reduced mobility.
Bruxism
: Chronic grinding or clenching of teeth causing excessive stress on the TMJ.
Treatment for TMJ disorders may include physical therapy, occlusal splints, medication,
or, in severe cases, surgical intervention.
Conclusion
The temporomandibular joint exhibits a highly specialized morphology that allows for
complex movements essential for daily functions. Its unique fibrocartilaginous structure,
articulation with an interposed disc, and coordinated muscle action distinguish it from other
synovial joints. Understanding the morphology of the TMJ is crucial for diagnosing and
managing TMJ-related disorders, ultimately improving patient outcomes.
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