Humerus

Definition

The humerus is the long bone in the upper arm, extending from the shoulder to the elbow. It is crucial for various arm movements and serves as an attachment site for many muscles.

5 Must Know Facts For Your Next Test

1. The humerus articulates with the scapula at the shoulder joint and with the radius and ulna at the elbow joint.
2. It is divided into three main parts: proximal end, shaft, and distal end.
3. The deltoid tuberosity on the lateral side of the humerus serves as an attachment point for the deltoid muscle.
4. The medial and lateral epicondyles at its distal end are important for muscle attachment and ligament support.
5. Fractures of the humerus are common injuries that can affect mobility and require medical intervention.

Review Questions

• What are the main parts of the humerus?
• Which muscles attach to the deltoid tuberosity of the humerus?
• How does a fracture in different parts of the humerus affect movement?

Related terms

scapula: Also known as the shoulder blade, it connects with the humerus to form part of the shoulder joint.

radius:

One of two bones in the forearm; it articulates with both the humerus and ulna.

ulna:

The longer bone in the forearm that runs parallel to the radius; it also connects with both humerus and radius.