This lecture explains the basics of anatomy of thigh, including the compartments, muscles and their innervation.
Anatomy of the thigh
The thigh is the area between the pelvis and the knee.
The single bone in the thigh (femur).
Thigh is divided to 3 groups of muscles called compartments.
Anterior compartment
Posterior compartment
Medial compartment
These three compartments are separated by fascia.
Compartments of the Thigh
Anatomy of the thigh
The anterior compartment muscles of the thigh flex the femur at the hip and extend the leg at the knee.
The posterior compartment muscles of the thigh extend the thigh and flex the leg.
The medial compartment muscles all adduct the thigh.
The anterior compartment of the thigh is homologous to the posterior compartment of the arm.
The posterior compartment of the thigh is homologous to the anterior compartment of the arm.
Thigh innervations:
Anterior compartment from femoral nerve L2,3,4.
Medial compartment from obturator nerve L2,3,4.
Posterior compartment from sciatic nerve L4,5,S1,2,3 (sacral plexus).
Medial Compartment
Muscles:
Gracilis.
Adductor longus.
Adductor brevis.
Adductor magnus.
Obturator externus
Medial Compartment
Innervation:
Obturator nerve
Adductor longus
Adductor brevis
Adductor magnus
Gracilis
Obturator externus
Posterior Compartment
Muscles:
Hamstrings:
Biceps Femoris:
Long head.
Short head.
Semimembranosus.
Semitendinosus.
Hamstring part of Adductor magnus
Posterior Compartment
Vascular Supply:
Perforating arteries (from profunda femoris)
Innervation
