Articular Disc

Articular Disc

Question 1. Articular disc.
Answer:

• It is an oval fibrous plate that divides the joint into upper and lower compartments.
• The upper compartment permits gliding movements and the lower permits rotator as well as gliding movements.

Articular disc Surface:

• Superior concavoconvex.
• Inferior-concave.

“Understanding the articular disc through FAQs: Structure, functions, and uses explained”

Articular disc Histology:

• The periphery of the disc is attached to a fibrous capsule.
• It is composed of an anterior extension, anterior thick bond, intermediate zone, posterior thick band, and bilaminar region.
• The anterior portion of the disk fuses with the anterior wall of the capsule.
• Above it, it blends with the periosteum of the anterior slope of the articular eminence.
• Below it, it merges with the periosteum of the front of the neck of the condyle.

Question 2. Lateral pterygoid
Answer:

• The lateral pterygoid muscle has two heads:

Lateral pterygoid Origin:

1. Upper head
   • Infratemporal surface & crest of the greater wing of the sphenoid
2. Lower head
   • The lateral surface of the lateral pterygoid plate

“Importance of studying the articular disc for anatomy students: Questions explained”

Lateral pterygoid Insertion:

• Pterygoid fovea on the anterior surface of the neck of the mandible
• Anterior margin of articular disc of TMJ

Lateral pterygoid Nerve supply:

• A branch from the anterior division of a mandibular nerve

“Common challenges in mastering articular disc notes effectively: FAQs provided”

Lateral pterygoid Action:

• Depression of mandible
• Protrusion of mandible
• Act alternatively with others for side-to-side movements