Which of the Following Structures Is Labeled D in the Diagram

question 53

Multiple Choice

Which of the following structures is labeled D in the diagram?

• A)Lumbar enlargement
• B)Cervical enlargement
• C)Conus medullaris
• D)Cauda equina
• E)Obturator nerve

---

Definitions:

Pronation

Rotation of the forearm so that the anterior surface is down (prone).

Radius

A bone in the forearm that extends from the lateral side of the elbow to the thumb side of the wrist.

Ulna

One of the two long bones in the forearm, extending from the elbow to the smallest finger, and playing a vital role in arm movement and stability.

Pivot Joint

A type of synovial joint that allows rotation around a single axis, such as the joint between the first and second cervical vertebrae in the neck.