The arteries of the leg

Introduction

The purpose of this comprehensive academic course is to provide an in-depth study on the arterial system of the lower limb, specifically focusing on its anatomy and physiology. This course belongs to the field of Angiology, Vascular Medicine, or Vascular Surgery. The following sections will systematically delve into the essential aspects related to this topic without employing schematic representations or illustrations.

Anatomical Overview

This section provides a general overview of the leg's anatomy and its segmentation, focusing on the bones, muscles, and associated structures relevant for understanding the arterial system.

The Leg's Segmentation

The lower limb is divided into three regions: the thigh, the calf, and the foot. Each region is further subdivided into compartments based on the underlying musculature.

Thigh

The thigh, which consists of the femur and its surrounding structures, is the uppermost portion of the leg. It houses some of the largest muscles in the body, such as the quadriceps femoris and the adductors.

Arterial Supply to the Leg

This section discusses the main arteries that supply blood to the leg, their origins, branches, and terminal vessels.

The Femoral Artery

The femoral artery is the principal vessel supplying the thigh region. It originates from the external iliac artery, which itself stems from the common iliac artery. The femoral artery descends through the femoral triangle, giving off branches that supply the muscles and other tissues of the thigh.

Branches of the Femoral Artery

1. Superficial Epigastric Artery: This branch supplies the superficial skin of the anterior abdominal wall.
2. Deep Epigastric Artery: This branch ascends to provide blood to the deep structures of the abdomen and the peritoneum.
3. Lateral Circumflex Femoral Artery: This artery runs around the lateral border of the femur, supplying muscles in this region.
4. Medial Circumflex Femoral Artery: This branch courses medially along the femur, supplying the adductor muscles and the hip joint.
5. Femorodorsalis Profunda Artery: This deep artery descends to the posterior aspect of the thigh, where it gives rise to branches that supply the gluteal muscles, the adductors, and the hip joint.
6. Popliteal Artery: The popliteal artery is the continuation of the femoral artery as it passes under the adductor magnus muscle at the level of the knee joint.

The Popliteal Artery

The popliteal artery runs through the popliteal fossa, giving off branches that supply the calf muscles and the posterior aspect of the leg.

Branches of the Popliteal Artery

1. Genicular Arteries: These branches supply the knee joint.
2. Posterior Tibial Artery: The largest branch of the popliteal artery, the posterior tibial artery descends along the medial aspect of the leg, providing blood to the calf muscles and the foot.
3. Anterior Tibial Artery: This artery runs anteriorly, supplying the anterior aspect of the leg and the dorsum of the foot.
4. Sural Artery: A branch of the posterior tibial or a direct continuation of the popliteal artery, the sural artery courses down the back of the leg to reach the lateral aspect of the foot.
5. Peroneal Artery: The peroneal artery is a branch of the anterior tibial artery that runs along the lateral border of the fibula. It contributes to the supply of the calf muscles and the dorsum of the foot.

Clinical Significance

This section discusses conditions and pathologies affecting the leg's arteries, their underlying causes, symptoms, diagnosis, treatment, and prognosis.

Atherosclerosis

Atherosclerosis is a progressive condition characterized by the deposition of plaque within the walls of the arteries, leading to narrowing or occlusion. It is the most common cause of peripheral artery disease (PAD), which predominantly affects the lower extremities.

Embolism

An embolus is a detached thrombus or foreign material that travels through the bloodstream and obstructs an artery. In the leg, emboli can originate from the heart or atherosclerotic plaques and result in various clinical manifestations, such as claudication or gangrene.

Thrombosis

Thrombosis refers to the formation of a blood clot within an artery, often due to damage or stasis. Thrombosis can be caused by various factors, including atherosclerosis, trauma, or inflammation, and may lead to ischemia or tissue necrosis in the affected region.