Adductor

Adductors are a group of muscles located in the medial compartment of the thigh that are primarily responsible for the adduction of the thigh. These muscles play a crucial role in stabilizing the pelvis during walking and running, and they assist in various movements of the lower limb.

Anatomy

The adductor group consists of five main muscles:

• Adductor longus: This is a long, triangular muscle that lies on the medial side of the thigh. It originates from the pubis and inserts into the middle third of the linea aspera of the femur.

• Adductor brevis: A short muscle located beneath the adductor longus, it originates from the inferior ramus of the pubis and inserts into the proximal part of the linea aspera.

• Adductor magnus: The largest muscle in the adductor group, it has both an adductor and a hamstring part. The adductor part originates from the inferior ramus of the pubis and the ischium, while the hamstring part originates from the ischial tuberosity. It inserts along the linea aspera and the adductor tubercle of the femur.

• Gracilis: A long, thin muscle that runs down the medial side of the thigh. It originates from the inferior ramus of the pubis and inserts into the medial surface of the tibia, contributing to the pes anserinus.

• Pectineus: A flat, quadrangular muscle that originates from the superior ramus of the pubis and inserts into the pectineal line of the femur.

Function

The primary function of the adductor muscles is to adduct the thigh, bringing it closer to the midline of the body. This action is essential for maintaining balance and stability during bipedal locomotion. Additionally, these muscles assist in flexion and medial rotation of the thigh.

Innervation

The adductor muscles are primarily innervated by the obturator nerve, which arises from the lumbar plexus. The adductor magnus also receives innervation from the sciatic nerve for its hamstring part.

Clinical Significance

Injuries to the adductor muscles, such as strains or tears, are common in athletes, particularly those involved in sports requiring sudden changes in direction or rapid acceleration. Such injuries are often referred to as "groin pulls." Proper conditioning and stretching can help prevent these injuries.

Also see

• Thigh
• Muscle
• Obturator nerve
• Hip joint