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🧠 Overview

The biceps brachii (Latin for “two-headed muscle of the arm”) is a two-headed muscle located on the anterior (front) aspect of the upper arm. It spans the shoulder and elbow joints and is primarily responsible for flexing the elbow and supinating the forearm (turning the palm upward).

🔍 Structure and Anatomy

1. Heads (Origins)

The biceps brachii has two heads that originate from the scapula (shoulder blade):

Long Head

Origin: Supraglenoid tubercle of the scapula.

Path: The tendon runs through the shoulder joint capsule and down the bicipital (intertubercular) groove of the humerus.

Functionally: Helps stabilize the shoulder joint.

Short Head

Origin: Coracoid process of the scapula (a small hook-like projection on the front of the shoulder blade).

2. Insertion

Both heads merge into a single muscle belly and insert onto:

Radial tuberosity of the radius (forearm bone)

Bicipital aponeurosis, which blends with the deep fascia of the forearm.

⚙️ Actions (Functions)

ActionDescriptionJointElbow flexionBends the forearm toward the upper armElbowForearm supinationTurns the palm upward (e.g., twisting a doorknob)Radioulnar jointShoulder flexionAssists in raising the arm forwardShoulder

💉 Innervation and Blood Supply

Nerve: Musculocutaneous nerve (C5–C6), from the brachial plexus.

Arterial supply: Brachial artery.

🩻 Clinical Relevance

Biceps Tendon Rupture:

Proximal rupture (usually long head) → “Popeye deformity” (bulge in lower arm).

Bicipital tendinitis:

Inflammation of the long head tendon, causing anterior shoulder pain.

Strength testing:

Tested by resisted elbow flexion and forearm supination.

📘 Related Muscles

Brachialis: Lies deep to the biceps; main elbow flexor.

Brachioradialis: Aids in elbow flexion, especially with the forearm in neutral (handshake position).

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