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Anterior over biceps tendon at the level of the humeral head Biceps tendon (longitudinal) as it emerges from its origin in the glenohumeral joint to enter the rotator cuff interval

Anterior Greater Tuberosity Greater Tuberosity Humeral Head Supraspinatus Tendon

Greater Tuberosity Middle Facet Footprint of Infraspinatus/Supraspinatus

Anterior Facet (Supraspinatus Insertion) Middle Facet (Interdigitated Supraspinatus-Infraspinatus Insertion)—this combined insertion stretches from the anterior part of the greater tuberosity, where most of the fibers are from the supraspinatus, to the posterior part of the middle facet where most of the fibers are from the infraspinatus. In the center of this attachment complex fibers from supraspinatus and from infraspinatus interdigitate, and the tendons cannot be distinguished. Inferior/Posterior Facet (Teres Minor Insertion) Biceps Groove Humeral Head Inferior (Underneath) Surface of the Acromion

Surface of Humeral Head Greater Tuberosity (where it begins a footprint) The Most Distal Greater Tuberosity (facet profiles)

Humeral Head Articular Hyaline Cartilage Supraspinatus Tendon (before insertion) Infraspinatus Tendon (before insertion) Biceps Tendon (within the interarticular rotator cuff interval) Subscapularis Tendon

Note: In this image, the patient’s shoulder is internally rotated. Posterior Deltoid Muscle Infraspinatus Tendon Spinoglenoid Notch/Groove Posterior Glenoid Joint Capsule Posterior Labrum Humeral Head

Deltoid Fascia Septation Posterior Deltoid Middle Deltoid Infraspinatus Tendon Humeral Head Middle Facet of the Greater Tuberosity

Deltoid Fascia Septation Posterior Deltoid Middle Deltoid Infraspinatus Tendon Humeral Head Middle Facet of the Greater Tuberosity

Posterior Deltoid Muscle Infraspinatus Tendon Spinoglenoid Notch/Groove Posterior Glenoid Joint Capsule Posterior Labrum Humeral Head Infraspinatus Muscle Glenoid Labrum

Posterior Glenoid Bony Cortex of the Scapula Intramuscular Septum of the Muscle Belly

3. Intramuscular Septum (central aponeurosis) of the Infraspinatus 4. Spine of the Scapula

Posterior Acromion Process Posterior Deltoid Infraspinatus Muscle Infraspinatus Tendon/Central Aponeurosi Infraspinatus Muscle Sagittal Humeral Head