What type of joints are the intercarpal joints?

Question

BlackTom AI · Accepted Answer

Question restatement: What type of joints are the intercarpal joints?

Options:
a. Pivot
b. Saddle
c. Secondary cartilagenous
d. Symphyseal
e. Plane

Analysis of each option:
Option a: Pivot joints are uniaxial joints allowing rotation around a single axis, such as those between the radius and ulna or between certain cervical vertebrae. This does not describe the intercarpal joints, which do not primarily permit rotation around a single axis; their movement is more limited and gliding in nature.
Option b: Saddle joints are biaxial joints that allow movement in two perpendicular planes, like the carpometacarpal joint of the thumb. The intercarpal joints do not function as saddle joints because their movements are mostly gliding between adjacent carpal bones rather than the complex concave-convex arrangement seen in saddle joints.
Option c: Secondary cartilaginous joints are joints joined by fibrocartilage with limited movement, such as the pubic symphysis or intervertebral discs. Intercarpal joints are not of this type; they are synovial joints with a synovial cavity and supporting ligaments, not rigid fibrocartilaginous bridges.
Option d: Symphyseal joints refer to cartilaginous joints with fibrocartilage discs that unite vertebral bodies or pubic bones, providing limited movement. This category does not apply to the intercarpal joints, which are not fused by a fibrocartilaginous disc between adjacent carpals.
Option e: Plane joints describe a type of synovial joint where articulating surfaces are nearly flat, allowing gliding movements. The intercarpal joints are classic examples of plane (gliding) joints, permitting small sliding motions that contribute to wrist mobility without substantial rotation.

Summary: Each incorrect option points to a joint type that does not match the anatomy and function of the intercarpal joints, which are best characterized as plane (gliding) joints. The planarity of the articular surfaces enables the subtle translational movements between neighboring carpal bones necessary for wrist flexibility.

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What type of joints are the intercarpal joints?

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Dashboard ASSESSABLE Wrist and Hand Quiz

What type of joints are the intercarpal joints?

View Explanation

Log in for full answers

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