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Questions and Answers
The joint between the trochlea and trochlear notch is known as the ______ joint.
humeroulnar
The ______ joint forms a ball and socket joint between the capitulum and concave radial head.
humeroradial
The ______ ligament consists of three bands: anterior, posterior, and inferior.
ulnar collateral
The ligament that attaches to the lateral epicondyle of the humerus is called the ______ ligament.
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The ______ ligament wraps around the head of the radius and inserts on the posterior margin of the radial notch of the ulna.
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Study Notes
Elbow Joint
- The elbow joint is a composite joint, meaning it consists of three separate joints within a single articular capsule.
Joints within the Elbow
- Humeroulnar Joint: A hinge joint formed between the trochlea of the humerus and the trochlear notch of the ulna, allowing for flexion and extension.
- Humeroradial Joint: A ball-and-socket joint formed between the capitulum of the humerus and the concave radial head, enabling flexion and extension, as well as some limited rotation.
- Proximal Radioulnar Joint: A pivot joint that shares the same articular capsule as the other two joints. It is located between the radial notch of the ulna and the head of the radius.
Elbow Ligaments
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Ulnar Collateral Ligament: Composed of three bands:
- Anterior Band: Attaches from the anterior epicondyle of the humerus to the medial margin of the coronoid process.
- Posterior Band: Attaches from the posterior epicondyle of the humerus to the olecranon.
- Inferior Band: Located between the coronoid process and the olecranon.
- Radial Collateral Ligament: Connects to the lateral epicondyle of the humerus and blends with the annular ligament inferiorly.
- Annular Ligament: Encircles the head of the radius, attaching to the anterior and posterior margins of the radial notch of the ulna.
Elbow Movements
- The elbow joint primarily allows for flexion and extension movements.
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Description
Explore the intricate structure of the elbow joint, including its composite nature and the three distinct joints it comprises. Understand the roles of the humeroulnar, humeroradial, and proximal radioulnar joints, along with the associated ligaments, especially the ulnar collateral ligament.
