Multiple Choice
In a uniaxial articulation, __________.
8. Joints
Joint Movements
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What type of motion is unique to mammals and is characterized by the posterior teeth gliding from side to side in a grinding motion?
A
medial incursion
B
medial excursion
C
lateral incursion
D
lateral excursion
Verified step by step guidance1
Understand the concept of 'lateral excursion': In anatomy, lateral excursion refers to the movement of the jaw side to side, which is a unique motion in mammals allowing for grinding of food.
Identify the anatomical structures involved: The temporomandibular joint (TMJ) is crucial for lateral excursion, as it allows the mandible to move side to side.
Consider the function of posterior teeth: These teeth, including molars, are designed for grinding food, which is facilitated by lateral excursion.
Differentiate from other types of motion: Medial incursion and medial excursion involve different directions of movement, not the side-to-side grinding motion characteristic of lateral excursion.
Relate to mammalian dietary needs: Lateral excursion is essential for mammals that require efficient processing of food through grinding, supporting their diverse diets.
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