# Gluteal Vessels in Detail

> Superior and inferior gluteal arteries for MBBS Anatomy: exit above and below piriformis, trochanteric and cruciate anastomoses, pelvic fracture bleeding.

- Canonical URL: https://prepelephant.com/topics/mbbs/anatomy/gluteal-vessels-detail
- Exam / course: MBBS · Subject: Anatomy
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Gluteal Vessels in Detail", PrepElephant, https://prepelephant.com/topics/mbbs/anatomy/gluteal-vessels-detail

## Direct answer

Superior and inferior gluteal arteries together supply every muscle of the gluteal region, and their exits from the pelvis are the anatomy that examiners test year after year. The superior gluteal artery — the largest branch and the terminal continuation of the posterior division of the internal iliac — leaves the greater sciatic foramen above piriformis, in company with the superior gluteal nerve and the L5 and S1 ventral rami, and divides into superficial and deep branches for gluteus maximus and for gluteus medius, minimus and tensor fasciae latae. The inferior gluteal artery, from the anterior division, leaves below piriformis with the sciatic nerve, posterior femoral cutaneous nerve, pudendal nerve and internal pudendal vessels, supplying gluteus maximus.

## What you must remember

- **Exit rule:** superior gluteal above piriformis, inferior gluteal below piriformis through the greater sciatic foramen — the single most quotable relation of the gluteal region.
- **Superior gluteal companions:** superior gluteal nerve (L5-S1) and the L5-S1 rami accompany it above piriformis, which is why the safe zone for intramuscular injection is the upper outer quadrant.
- **Deep branch course:** runs between gluteus medius and minimus, and injury here — from iliac crest bone graft harvesting, hip surgery or pelvic fracture — denervates or devascularises the abductors, producing a Trendelenburg lurch.
- **Inferior gluteal companions:** sciatic nerve, posterior cutaneous nerve of thigh, pudendal nerve and internal pudendal artery all leave together below piriformis, so a misplaced gluteal injection endangers the sciatic nerve.
- **Trochanteric anastomosis:** superior gluteal, inferior gluteal and ascending branch of the medial circumflex femoral artery (with contribution from the lateral circumflex) at the greater trochanter — feeding the retinacular vessels of the femoral head.
- **Cruciate anastomosis:** at the level of the lesser trochanter, the first perforating branch of the profunda joins transverse branches of the medial and lateral circumflex femoral arteries and the inferior gluteal artery — the collateral that rescues the limb after femoral artery ligation.
- **Pelvic haemorrhage:** the superior gluteal artery is the vessel most often torn in displaced pelvic fractures, fixed against the greater sciatic notch, and the prime target of arterial embolisation.

## How the vessels behave in injury

Consider a young man thrown from a motorcycle with a lateral compression pelvic fracture and falling haemoglobin. The bleeding vessel, more often than not, is the superior gluteal artery: it is tethered where it crosses the greater sciatic notch, so displaced fragments shear it against bone. The interventional radiologist embolises it through the internal iliac system, sparing at least one internal iliac territory. The same vessel appears in elective practice: during posterior hip approaches the short rotators protect it, and iliac crest graft harvesting can divide it where it escapes the notch.

The anastomoses then tell the survival story. Ligate or occlude the femoral artery in the thigh, and blood reaches the leg through the cruciate anastomosis — inferior gluteal flow descending to meet ascending perforators and circumflex branches — and around the trochanteric ring into the retinacular vessels. In the adult head nearly all supply comes from the medial circumflex ascending branch, which is why displaced femoral neck fractures tearing the retinacular vessels cause avascular necrosis.

## How the examiner frames the region

The standard ladder begins with "which artery leaves above piriformis" and ends with "why is the upper outer quadrant the safe injection zone" — the expected answer links the sciatic nerve's entry below piriformis at mid-gluteal level with the superior gluteal bundle's exit above, defining a quadrant that avoids both. The second rung is anastomotic: name the contributors of the cruciate anastomosis and state its function after femoral ligation; the candidate who also names the trochanteric anastomosis as the femoral head's supply route earns the applied mark. Finally, the Trendelenburg sign after hip surgery is the clinical synthesis examiners like: a patient who lurches because the abductors' nerve or vessel was injured where the deep branch of the superior gluteal runs between medius and minimus. Quoting that exact intermuscular plane is what separates a pass from a distinction answer.

## Frequently asked questions

### Where does the superior gluteal artery leave the pelvis?

Through the greater sciatic foramen above piriformis, with the superior gluteal nerve — the only arterial structure to exit above that muscle.

### Which vessels form the cruciate anastomosis?

The first perforating branch of the profunda femoris, transverse branches of the medial and lateral circumflex femoral arteries, and the inferior gluteal artery, at the level of the lesser trochanter.

### Why is the superior gluteal artery injured in pelvic fractures?

It is large, fixed against the greater sciatic notch, and lies in the path of displaced fragments.

### What does the trochanteric anastomosis supply?

The femoral head through retinacular branches, chiefly from the ascending branch of the medial circumflex femoral artery reinforced by the gluteal vessels.

### Why do intramuscular injections go into the upper outer gluteal quadrant?

To keep the needle clear of the sciatic nerve and inferior gluteal vessels entering below piriformis, and away from the superior gluteal bundle hugging the iliac crest region.