Gluteus Maximus Supply
Nerve Innervation
The gluteus maximus is innervated by the inferior gluteal nerve, which arises from the sacral plexus (L5-S2 nerve roots). 1
The inferior gluteal nerve exits the pelvis through the greater sciatic foramen, typically below the piriformis muscle, and enters the deep surface of the gluteus maximus to provide motor innervation 1.
Key Anatomical Points:
- Primary innervation: Inferior gluteal nerve (L5-S2) provides motor function 2
- Dual innervation variant: In rare cases, the gluteus maximus may receive dual innervation, though this is an anatomical variation 2
- Cutaneous branches: The inferior gluteal nerve frequently (75% of cases) gives off cutaneous branches that pierce through the gluteus maximus to innervate overlying skin, particularly in the lower outer quadrant of the muscle 3
- Intramuscular distribution: Neural branches are densest in the middle portion of the muscle (30-70% range across cranial, middle, and caudal segments) 4
Arterial Supply
The gluteus maximus receives its arterial supply primarily from the inferior gluteal artery and superior gluteal artery. 1
Arterial Anatomy:
- Inferior gluteal artery: Main blood supply, exits the pelvis through the greater sciatic foramen below the piriformis muscle and supplies the lower half of the gluteus maximus 2, 5
- Superior gluteal artery: Contributes to vascular supply, typically exits above the piriformis muscle 2
- Anatomical variants: The inferior gluteal artery may occasionally pass through the piriformis muscle rather than below it (rare variant) 5
Clinical Relevance:
The neurovascular bundle (superior gluteal nerve and artery) can be mobilized between the sciatic notch and the entrance to the gluteus medius during surgical approaches, allowing wider exposure while preserving gluteal muscle function 6. Understanding this anatomy is critical for:
- Hip and pelvic surgical approaches
- Avoiding iatrogenic injury during procedures
- Injection therapies and EMG electrode placement 4
- Diagnosing gluteal pain syndromes 3
The sacral plexus branches that supply the gluteal region (including motor innervation to gluteal muscles) emerge from L1-S4 nerve roots, with the inferior gluteal nerve specifically arising from the sacral plexus 1.