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Q9(b):
Name the type of joint between the following:- (b) carpal/metacarpal of thumb

Solution :

Anatomical Classification: Carpo-Metacarpal Joint of the Thumb

The joint between the trapezium bone of the carpus (wrist) and the first metacarpal bone (base of the thumb) is anatomically classified as a Saddle Joint.

Structural and Functional Analysis

The classification is determined by the specific morphology of the articular surfaces:

  • Articular Geometry: Each of the two participating bones has a surface that is concave in one direction and convex in the other, fitting together like a rider in a saddle [Ref: Arthrokinematics of Synovial Joints].
  • Degrees of Freedom: This joint allows for biaxial movement, facilitating flexion, extension, abduction, adduction, and circumduction.
  • Unique Feature: The saddle configuration is the structural prerequisite for opposition—the movement that allows the thumb to touch the tips of the other digits—a defining characteristic of primate dexterity [Per Evolutionary Biological Morphology].

Visual Representation of the Saddle Joint

Trapezium (Concave-Convex) 1st Metacarpal (Convex-Concave) Movement

Comparative Overview of Synovial Joints

Joint Type Anatomical Example Range of Motion
Saddle Carpal-Metacarpal (Thumb) Biaxial (Flexion/Extension/Abd/Add)
Hinge Elbow (Humeroulnar) Uniaxial (Flexion/Extension)
Ball and Socket Glenohumeral (Shoulder) Multiaxial (All planes)

Final Solution: The joint between the carpal and metacarpal of the thumb is a Saddle Joint.


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