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Q9(d):
Name the type of joint between the following:- (d) femur/acetabulum

Solution :

Anatomical Identification and Classification

The joint formed between the femur (specifically the head of the femur) and the acetabulum (the cup-like cavity of the coxal/hip bone) is classified as a Ball and Socket Joint [Per the anatomical classification of synovial joints].

Step 1: Structural Analysis of the Joint

  • Component A: The head of the femur, which is spherical in shape, acts as the "ball."
  • Component B: The acetabulum of the pelvic girdle acts as the deep, concave "socket."
  • Biological Function: This specific configuration allows for multi-axial movement, enabling the lower limb to perform flexion, extension, abduction, adduction, rotation, and circumduction [By the principle of joint mechanics].

Step 2: Visual Representation

Acetabulum Femur Ball and Socket

Step 3: Comparative Context

Feature Description
Joint Category Synovial Joint
Specific Type Ball and Socket
Range of Motion Multi-axial (High degree of mobility)

Final Solution: The joint between the femur and the acetabulum is a Ball and Socket joint.


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