Neural Control Of Swallowing

Neural Control Of Swallowing

Question 1. Articular capsule.
Answer:

• The TMJ is enclosed in it.

Articular capsule Attached to:

• Borders of the articulating surfaces of the mandibular fossa.
• The eminence of the temporal bone.
• The neck of the mandible.

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Articular capsule Consists of:

• Internal synovial layer.
• The outer fibrous layer contains veins, nerves, and collagen fibers.

Articular capsule Nerve supply:

• Trigeminal nerve.

Articular capsule Blood supply:

• Maxillary, temporal, and masseteric arteries.

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Question 2. Articular disc.
Answer:

• It is an oval fibrous plate that divides TMJ into compartments.

Articular disc Compartments:

• Upper compartments permit gliding movements
• Lover compartment – permits rotatory as well as gliding movements.

Articular disc Surfaces:

• Superior surface – concavoconvex.
• Inferior surface – concave.

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Articular disc Composed of:

• Anterior extension
• Anterior thick band
• Intermediate zone
• Posterior thick band
• Bilaminar region.

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Question 3. Neural control of deglutition.
Answer:

• Deglutition is triggered by afferent impulses
• These impulses arise from
  • Oral mucous membrane and pharynx
  • Posterior pharyngeal wall;
  • Soft palate and
  • Epigoltis.
• These impulses travel in trigeminal glossopharyngeal and vagus nerves.
• This stimulates a group of nerve cells located in the floor of the ventricle.
• The efferent fibers pass through motor fibers of hypoglossal) nerves to the pharyngeal musculature and the tongue.