Upper limb
Glenoid labrum
Labrum glenoidale
- Origin
- Circumferential fibrocartilaginous rim attached to glenoid cavity rim
- Insertion
- Superiorly anchors long head of biceps tendon; continuous with joint capsule and glenohumeral ligaments
- Function
- Deepens glenoid socket by 50%, enhances articular surface area, and provides seal for negative intra-articular pressure (suction effect)
- Innervation
- Suprascapular and axillary nerves (rich in Ruffini and Pacinian mechanoreceptors)
- Movement & chain
- Compliant seal adapting during multi-axial humeral motion
- Palpation
- Intra-articular, non-palpable
- Clinical
- SLAP tears (Superior Labrum Anterior-to-Posterior) in overhead throwing athletes; Bankart lesion in anterior instability; paralabral cysts causing suprascapular nerve entrapment.
- Segmental innervation
- C5–C6
- In clinical practice
- O'Brien test, Crank test, and kinetic chain throwing rehabilitation
- Region in the model
- Upper limb