Triangular interval

Triangular Interval is a term used in the field of anatomy to describe a specific space in the human body. It is located in the upper limb, specifically in the arm, and is bordered by three different structures: the teres major muscle, the long head of the triceps brachii muscle, and the humerus.

Etymology

The term "triangular interval" is derived from the Latin words "triangulum" which means "triangle", and "intervallum" which means "space between". This is a direct reference to the shape and location of this anatomical feature.

Anatomy

The triangular interval is a space located in the posterior compartment of the arm. It is bordered by the teres major muscle superiorly, the long head of the triceps brachii muscle medially, and the humerus laterally. The radial nerve and the profunda brachii artery pass through this space.

Clinical Significance

Due to the passage of the radial nerve and the profunda brachii artery through the triangular interval, any injury or disease affecting this area can potentially lead to nerve damage or vascular compromise. This can result in symptoms such as paresthesia (tingling or numbness), muscle weakness, and ischemia (reduced blood flow).

Related Terms

• Axilla: The underarm or armpit; a region directly superior to the triangular interval.
• Brachial Plexus: A network of nerves that send signals from the spine to the shoulder, arm, and hand. The radial nerve, which passes through the triangular interval, is a branch of the brachial plexus.
• Radial Tunnel Syndrome: A condition that occurs when the radial nerve is compressed at any point along its course, potentially at the triangular interval.

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