01 / Geometry
See around, not just through.
The 3D subset keeps the source positions of 15 separate structures. Rotate the arm, hide a layer, or isolate a muscle to inspect its shape.
Upper arm · Muscle
Biceps brachii
A two-headed muscle of the anterior upper arm that flexes the elbow and powerfully supinates the forearm.
Atlas noteBiceps means “two-headed”: the long and short heads begin at different points on the scapula, then unite.
RIGHT SHOULDER & ARMBodyParts3D / 4.0
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02 / Explore
Follow the arm to the elbow.
Continue into the elbow study for a close-up of three bones and ten muscle parts, with layers you can hide and individual structures you can select.
Explore the elbow in 3D →Scope / Honest limits
Shape is not photorealism.
This is a reduced-resolution model, not a complete dissection. Skin, vessels, nerves and most neighboring muscles are omitted. Colors and shading are illustrative; there are no realistic muscle-fiber textures. Anatomical review is still required.
Overview
What is the biceps brachii?
The biceps brachii is a superficial fusiform muscle on the front of the upper arm. Its long and short heads arise from the scapula, merge into a common muscle belly, and attach distally to the radius and forearm fascia.
Because it crosses both the shoulder and elbow, the biceps can contribute to movement at both joints. Its strongest actions are forearm supination and elbow flexion, especially when the forearm is already supinated.
Attachments
Origin
The long head originates from the supraglenoid tubercle of the scapula. The short head originates from the tip of the coracoid process alongside the coracobrachialis.
Insertion
The shared distal tendon inserts on the radial tuberosity. The bicipital aponeurosis fans medially into the deep fascia of the forearm.
Function
The biceps flexes the elbow and supinates the forearm, rotating the palm to face anteriorly in anatomical position. It also weakly assists shoulder flexion and helps stabilize the humeral head.
Innervation
The musculocutaneous nerve supplies both heads, primarily through spinal nerve roots C5 and C6.
Blood supply
Muscular branches of the brachial artery provide the principal blood supply, with contributions from neighboring arterial networks.