The deep deltoid fascia forms intramuscular septa giving the deltoid its multipennate architecture and allowing semi-independent head function.
| Origin | Deep surface of deltoid — intramuscular septa |
|---|---|
| Insertion | Deltoid tuberosity deep surface |
| Nerve Supply | Axillary nerve (C5, C6) |
| Blood Supply | Posterior circumflex humeral artery |
| Actions | Transmits force between individual deltoid heads; Provides compartmental separation of the three heads |
|---|
The deep deltoid fascia is opened in deltoid-splitting approaches. Splitting beyond 5 cm risks axillary nerve branches. Reattachment of this fascial layer is essential in deltoid repair after shoulder arthroplasty.
Not directly palpable — assessed by selective head isolation during resisted movements.
Axillary nerve branch injury from over-extensive deltoid splitting producing anterior deltoid weakness after proximal humeral fracture fixation.
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