Subscapularis

The anterior cuff muscle

Subscapularis is the rotator-cuff muscle on the costal side of the scapula.

This scene contains the shoulder and arm, not the complete thorax. An exposed surface in the viewer can therefore be normally covered by anatomy omitted from the subset.

Sources: Arm anatomy tables

A different humeral tubercle

It arises from the subscapular fossa and attaches to the lesser tubercle, with connections to the nearby groove margin and shoulder capsule.

The other three cuff muscles attach at the greater tubercle. Compare the bone in context, but do not treat the reduced-resolution mesh as a detailed footprint map.

Sources: Loyola anatomy · Arm anatomy tables

Internal rotation and shoulder support

Subscapularis medially rotates the arm and helps stabilize the shoulder. Medial and internal rotation describe the same direction here.

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.

Use the related links to contrast its action with infraspinatus and teres minor. Opposing action names do not imply that these muscles work independently in a living shoulder.

Sources: Loyola anatomy

Upper and lower subscapular nerves

Both upper and lower subscapular nerves supply this muscle.

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

No internal nerve territories are reconstructed within the selected surface.

Sources: Loyola anatomy

Read the model

Explore subscapularis in 3D

1. Start from the front. Choose Front, then rotate toward Oblique. Focus selection returns the isolated mesh to a useful framing.
2. Restore the scapula. Choose Show context and Fade others. Alternate Subscapularis and Scapula to understand their relationship; there is no rib-cage layer to enable.
3. Compare front and back. Select Infraspinatus, switch to Back and inspect its position. Return to Subscapularis through the list or the reciprocal related link.

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, Subscapularis

   Named muscle: attachments, principal action and nerve. Original educational summary; no source illustration reproduced.

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

   Four rotator-cuff rows: group membership and comparison of named attachments, actions and nerve supply. No source illustrations reproduced.

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