Deltoid · acromial part

The acromion is part of the scapula

The acromial part lies between the anterior and posterior deltoid portions. Its name refers to the acromion, a projection of the scapula.

There is no separate Acromion item in this viewer. Select Scapula to see the bone that includes it; a missing list item does not mean the landmark is absent from the bone.

Sources: Arm anatomy tables · Loyola anatomy

From the shoulder tip to the arm

This part begins at the acromion and reaches the deltoid tuberosity on the humerus.

Try an oblique view before hiding the surrounding meshes. The isolated shape is useful for recognition, but restoring context makes it easier to judge which bone is beside each end.

Sources: Loyola anatomy

Studying abduction without a simulation

The middle portion contributes to arm abduction: movement away from the side of the body.

The source pose is fixed. Turning the camera does not raise the arm or rotate the humerus within the socket; the viewer does not simulate muscle contraction or shoulder mechanics.

No exact movement angle, force or muscle recruitment can be read from this static surface. Compare the four rotator-cuff meshes in the structure list, but do not interpret their shapes as a simulation of coordinated movement.

Sources: Arm anatomy tables

Supply is not shown by the surface colors

The axillary nerve supplies deltoid. Arterial contributors include the posterior circumflex humeral artery and the deltoid branch of the thoracoacromial artery.

Nerves and vessels are not loaded in this subset, so the text describes connections you cannot select in the viewer.

Sources: Arm anatomy tables

Read the model

Explore deltoid · acromial part in 3D

1. Find a useful viewing angle. Choose Oblique, then drag to inspect the selected mesh. Focus selection recenters it without changing the underlying pose.
2. Restore the scapula. Choose Show context, select the acromial part and enable Fade others. Select Scapula to inspect its lateral projection, then return to the muscle part.
3. Rebuild the three-part comparison. Select the clavicular and spinal parts in turn. Keep the same viewpoint for the first comparison, then rotate to inspect overlapping surfaces.

Sources and editorial status

This guide uses independently written explanations with links to the evidence behind them. Source checking and specialist anatomical review are separate steps; the latter is still pending.

1. Loyola University Chicago — LUMEN, Deltoid

   Deltoid attachments and part-specific actions. No source illustrations reproduced.

2. Texas Tech University Health Sciences Center El Paso — Axilla, Posterior Shoulder, & Arm

   Deltoid and coracobrachialis rows: actions, nerve and arterial supply; scapular landmarks.

3D geometry and its separate license are credited beneath the viewer. References do not imply endorsement of this site.