Question

the joint between the l2 and l3 vertebrae is a ______.

a. synostosis
b. gomphosis
c. synchondrosis
d. symphysis
e. syndesmosis

Explanation:

Identify the joint type between L2 and L3 vertebrae

The joint between adjacent vertebral bodies (such as L2 and L3) is formed by an intervertebral disc. This disc consists of fibrocartilage that connects the articulating surfaces of the bones.

Classify the joint structurally

Using the Joint Classification knowledge point, joints are classified structurally based on the binding material. A cartilaginous joint where the bones are joined by fibrocartilage is classified specifically as a symphysis.

Evaluate the given options

• A. synostosis: A bony joint formed by the fusion of two bones (e.g., portions of the skull or hip bone).
• B. gomphosis: A fibrous joint that anchors a tooth to its bony socket.
• C. synchondrosis: A cartilaginous joint where bones are joined by hyaline cartilage (e.g., the epiphyseal plate).
• D. symphysis: A cartilaginous joint joined by fibrocartilage, which perfectly describes the intervertebral disc between L2 and L3.
• E. syndesmosis: A fibrous joint where bones are bound by relatively long collagenous fibers (e.g., the interosseous membrane between the radius and ulna).

Answer:

• A synostosis
• B gomphosis
• C synchondrosis
• D symphysis (Correct answer)
• E syndesmosis