Temporomandibular Joint Anatomy

Temporomandibular Joint Anatomy

Question 1. Functions of temporomandibular joint
Answer:

• TMJ helps with mandibular movements
• When the mouth is opened
• Two distinct motions occur at the joint
• The first motion is rotation around a horizontal axis through the condylar heads
• The second motion is a translation
• In it, the condyle and meniscus move together anteriorly beneath the articular eminence
• In closed-mouth position
• A thick posterior band of meniscus lies immediately above the condyle
• As the condyle translates forward, the thinner intermediate zone of the meniscus becomes articulating surface
• When the mouth is fully opened
• Condyle lie beneath the anterior band of the meniscus

“Understanding temporomandibular joint anatomy through FAQs: Composition, functions, and uses explained”

Question 2. Masseter
Answer:

• Quadrilateral in shape
• Has two layers

Masseter Origin:

• Superficial layer
• Anterior 2/3rd of the lower border of the zygomatic arch
• Zygomatic process of maxilla
• Deep layer
• The deep surface of the zygomatic arch

Masseter Insertion:

• Upper & anterior part of the lateral surface of the ramus of the mandible
• Part of the Coronoid process

“Importance of studying temporomandibular joint anatomy for medical students: Questions explained”

Masseter Nerve supply:

• Massetric nerve
• A branch from the anterior division of a mandibular nerve

Masseter Action:

• Elevates mandible
• Superficial fibers help in Protrusion
• Deep fibers help in the retraction of mandible