Podcast
Questions and Answers
Which structural component primarily facilitates hinge movement within the temporomandibular joint (TMJ)?
Which structural component primarily facilitates hinge movement within the temporomandibular joint (TMJ)?
- The upper joint cavity.
- The vascular superior limb.
- The posterior bilaminar zone.
- The lower joint cavity. (correct)
Within the histology of the adult condyle, which layer is characterized by a high concentration of cells?
Within the histology of the adult condyle, which layer is characterized by a high concentration of cells?
- Fibrous articular layer
- Bone
- Calcified cartilage layer
- Cell rich zone (correct)
What is a key distinction in the structure of the child condyle compared to primary cartilage?
What is a key distinction in the structure of the child condyle compared to primary cartilage?
- More abundant extracellular matrix between cells.
- Alignment of cells into columns.
- Reduced extracellular matrix between cells. (correct)
- Greater intrinsic growth potential.
Which ligament directly connects to the pterygoid hamulus?
Which ligament directly connects to the pterygoid hamulus?
What characteristic is associated with the central fibers of the intra-articular disc?
What characteristic is associated with the central fibers of the intra-articular disc?
Which region of the temporomandibular joint's gross anatomy is known for being avascular?
Which region of the temporomandibular joint's gross anatomy is known for being avascular?
What type of collagen primarily composes the structure of the adult condyle?
What type of collagen primarily composes the structure of the adult condyle?
What structural feature is present in the child condyle that is indicative of its growth and development?
What structural feature is present in the child condyle that is indicative of its growth and development?
Which nerve provides sensory innervation to the temporomandibular joint capsule?
Which nerve provides sensory innervation to the temporomandibular joint capsule?
What is the role of fibroblasts in the intra-articular disc of the temporomandibular joint?
What is the role of fibroblasts in the intra-articular disc of the temporomandibular joint?
Flashcards
Articular Eminence
Articular Eminence
The bony prominence on the temporal bone that forms part of the temporomandibular joint.
Mandibular Fossa
Mandibular Fossa
The depression in the temporal bone that articulates with the mandibular condyle.
Mandibular Condyle
Mandibular Condyle
The part of the mandible that articulates with the temporal bone
Upper Joint Cavity
Upper Joint Cavity
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Lower Joint Cavity
Lower Joint Cavity
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Articular Disc
Articular Disc
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Ligaments (TMJ)
Ligaments (TMJ)
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Auriculotemporal Nerve
Auriculotemporal Nerve
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Capsule (TMJ)
Capsule (TMJ)
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Fibrous Articular Layer
Fibrous Articular Layer
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Study Notes
- Temporomandibular Joint, or TMJ, gross anatomy, innervation and histology comprise: articulating bones; articular disc; ligaments; capsule; auriculotemporal nerve; and masseteric nerve.
Articulating Bones
- The TMJ involves the articular eminence (temporal bone), mandibular fossa (temporal bone), and mandibular condyle (mandible).
Joint Cavities and Movement
- The lower joint cavity facilitates hinge movement.
- The upper joint cavity supports gliding movement.
Articular Disc Zones
- The articular disc includes an avascular area.
- It includes, a thinner central zone.
- It includes, a a posterior bilaminar zone.
Ligaments
- The TMJ ligaments consist of the pterygomandibular raphe, sphenomandibular ligament, stylomandibular ligament, and temporomandibular ligament.
Capsule
- The capsule, lined by a synovial membrane, encapsulates the TMJ.
Structure of Adult Condyle
- The adult condyle contains specific layers.
- The adult layers are fibrous articular layer, cell-rich zone, fibrocartilage layer, calcified cartilage layer, and bone.
- It mainly crimped with Type I collagen.
- It has central fibers aligned anteroposteriorly.
- It has fibroblasts connected by numerous processes.
Intra-Articular Disc
- Intra-articular disc has occasional islands of fibrocartilage with age.
Structure of Child Condyle
- The child condyle has a presence of secondary cartilage.
- It differs from primary cartilage by having less extracellular matrix between cells.
- The child condyle has fibroblast-like cells that undergo division.
- There is no alignment of cells into columns.
- Child condyle has little intrinsic growth potential when compared to primary cartilage.
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