Brachialis - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The brachialis is a muscle in the anterior compartment of the upper arm. It lies deep to the biceps brachii and forms the floor of the cubital fossa. Attachments: Originates from the medial and lateral surfaces of the humerus shaft. It inserts onto the ulnar tuberosity, immediately distal to the elbow joint. Function: Flexion at the elbow. Innervation: Musculocutaneous nerve (with contributions from the radial nerve). Blood supply: Brachial artery and radial artery By TeachMeSeries Ltd (2026) Fig 1The coracobrachialis, biceps brachii and brachialis muscles of the anterior upper arm. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Frequent questions What is the brachialis muscle? The brachialis is a muscle located in the anterior compartment of the upper arm, positioned beneath the biceps brachii and forming the floor of the cubital fossa. What are the attachments of the brachialis muscle? The brachialis originates from the medial and lateral surfaces of the humeral shaft and inserts onto the ulnar tuberosity, just distal to the elbow joint. What is the primary function of the brachialis? The primary function of the brachialis is to facilitate flexion at the elbow, making it a key muscle for this movement. Which nerves innervate the brachialis muscle? The brachialis is primarily innervated by the musculocutaneous nerve, with additional contributions from the radial nerve. What is the blood supply to the brachialis muscle? The brachialis receives its blood supply from the brachial artery and the radial artery, ensuring it has adequate circulation for its function. Rate This Article