<prompt> Lateral boundary of cubital fossa is formed by:BrachioradialisPronator teresBrachialisBiceps  <response>: Brachioradialis Boundaries of cubital fossa- Laterally - Medial border of brachioradialis. Medially - Lateral border of pronator teres. Base - It is directed upwards, and is represented by an imaginary line joining the front of two epicondyles of the humerus. Apex - It is directed downwards, and is formed by the area where brachioradialis crosses the pronator teres muscle. Ref: Gray;s anatomy text book of anatomy BD chaurasia 21st Ed. 