Lower Limb.3 (The Thigh “Medial group of muscles”)

Lower Limb.3 (The Thigh “Medial group of muscles”)


Medial to our land mark, (medial to the vein,
artery and nerve), we’ll have the medial group of muscles. It, consists of 3 layers of adductor
muscles, the most superficial is this muscle, which is the adductor longus. And, deep to
it, there is the adductor brevis and most posteriorly we
have the adductor magnus. The, adductor brevis
separates the adductor longes anteriorly from the adductor magnus posteriorly. And, very
medial we have a muscle that goes down to become inserted at the same insertion of the
sartorius but it’s different from the sartorius. So, very superficial in the medial group,
we’ve the gracilis muscle, which becomes narrow as we go down. And, it’s inserted by a small
tendon into the upper part of the medial surface of the tibia with the sartorius. It’s inserted
just behind the sartorius. The, two muscles have different shapes. The, sartorius has
parallel fibres, like ribbon shape. And, the gracilis is wide at its origin and as we go
down it becomes narrow until it forms a small tendon. So, in the medial group we have the
adductor brevis separating the adductor longus from the adductor magnus. All, the muscles
of the medial group are supplied by the obturator nerve, they have enervation from the obturator
nerve. The, adductor magnus is supplied posteriorly by the sciatic nerve. So, we have the adductor
longus, behind it we have the adductor brevis and very posterior we have the adductor magnus
and very medial we have the gracilis. As, the adductor brevis separates the adductor
longus from the adductor magnus, it also separates the anterior division of the obturator nerve anterior to it from the
posterior division of the obturator nerve posterior to it and going to the adductor
magnus. All, the muscles of the medial group have a common attachment above the pubic bone
and they are inserted posteriorly into the linea aspera into the back of the femur, therefore
they adduct the femur, they take it to the pubic bone, that’s why they are called “adductor”,
except the gracilis which is a special insertion with the sartorius.

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