Adductor magnus muscle

Adductor magnus muscle
Anterior Hip Muscles 2.PNG
The adductor magnus and nearby muscles
Gray344.png
Structures surrounding right hip-joint (adductor magnus at upper right)
Details
OriginPubis, tuberosity of the ischium
InsertionLinea aspera and adductor tubercle of femur
ArteryDeep femoral artery
NervePosterior branch of obturator nerve (adductor) and sciatic nerve (hamstring)
ActionsAdduction of hip (both portions)
flexion of hip (adductor portion)
extension of hip (hamstring portion)
Identifiers
LatinMusculus adductor magnus
TAA04.7.02.028
FMA22443
Anatomical terms of muscle

The adductor magnus is a large triangular muscle, situated on the medial side of the thigh.

It consists of two parts. The portion which arises from the ischiopubic ramus (a small part of the inferior ramus of the pubis, and the inferior ramus of the ischium) is called the pubofemoral portion, adductor portion, or adductor minimus, and the portion arising from the tuberosity of the ischium is called the ischiocondylar portion, extensor portion, or "hamstring portion". Due to its common embryonic origin, innervation, and action the ischiocondylar portion (or hamstring portion) is often considered part of the hamstring group of muscles. The ischiocondylar portion of the adductor magnus is considered a muscle of the posterior compartment of the thigh while the pubofemoral portion of the adductor magnus is considered a muscle of the medial compartment.

Structure

Pubofemoral (adductor) portion

Those fibers which arise from the ramus of the pubis are short, horizontal in direction, and are inserted into the rough line of the femur leading from the greater trochanter to the linea aspera, medial to the gluteus maximus.

Those fibers from the ramus of the ischium are directed downward and laterally with different degrees of obliquity, to be inserted, by means of a broad aponeurosis, into the linea aspera and the upper part of its medial prolongation below.

Ischiocondylar (hamstring) portion

The medial portion of the muscle, composed principally of the fibers arising from the tuberosity of the ischium, forms a thick fleshy mass consisting of coarse bundles which descend almost vertically, and end about the lower third of the thigh in a rounded tendon which is inserted into the adductor tubercle on the medial condyle of the femur, and is connected by a fibrous expansion to the line leading upward from the tubercle to the linea aspera.

Relations

By its anterior surface the adductor magnus is in relation with the pectineus, adductor brevis, adductor longus, femoral artery and vein, profunda artery and vein, with their branches, and with the posterior branches of the obturator artery, obturator vein and obturator nerve.

By its posterior surface with the semitendinosus, semimembranosus, biceps, and gluteus maximus muscle.

By its inner border with the gracilis and sartorius.

By its upper border with the obturator externus, and quadratus femoris.[1]

Nerve supply

It is a composite muscle as the adductor and hamstring portions of the muscle are innervated by two different nerves. The adductor portion is innervated by the posterior division of the obturator nerve while the hamstring portion is innervated by the sciatic nerve.[2][3]

Osseoaponeurotic openings

At the insertion of the muscle, there is a series of osseoaponeurotic openings, formed by tendinous arches attached to the bone. The upper four openings are small, and give passage to the perforating branches of the profunda femoris artery. The lowest (often referred to as the adductor hiatus) is large, and transmits the femoral vessels to the popliteal fossa.

Variation

The upper, lateral part of the adductor magnus is an incompletely separated division often considered a separate muscle — the adductor minimus.[4] These two muscles are frequently separated by a branch of the superior perforating branch of the profunda femoris artery.[5]