What are the nerve roots of the obturator nerve?
What are the motor functions of the obturator nerve?
Innervates the medial (adductor) compartment of the thigh
What are the sensory functions of the obturator nerve?
Cutaneous branch innervates the skin of the medial thigh
In the first part of its anatomical course, where does the obturator nerve descend through?
Descends through the fibres of the psoas major and emerges from its medial border
After descending through the first part of its anatomical course, where does the obturator nerve run?
Runs posteriorly to the common iliac arteries and laterally along the pelvic wall to the obturator foramen
In the final art of its anatomical course, where does the obturator nerve enter the thigh? What does it then do?
Enters through the obturator canal
Splits into anterior and posterior divisions
Between what muscles does the anterior division of the obturator nerve descend through?
To what muscles does it give branches off to?
What does it then branch off to and become?
Adductor Longus and adductor brevis
Gives branches off to the adductor longus, aductor brevis and gracilis muscles
Pierces the fascia lata to become the cutaneous branch of the obturator nerve
What muscle does the posterior division of the obturator nerve descend through?
What muscle does is pass and give branches off to?
Passes anteriorly to adductor magnus and then gives branches off to supply it
What muscles does the obturator nerve innervate in the medial compartment of the thigh?
All of them except the hamstring part of the adductor magnus
Where does the cutaneous branch of the obturator nerve supply?
Middle part of the medial thigh
What surgeries can damage the obturator nerve?
Surgeries involving the pelvis or abdomen
How would damage to the obturator nerve clinically present?
Paraesthesia on the medial aspect of the thigh and weakness in adduction of the thigh
Alternatively, the patient could present with posture and gait problems due to the loss of adduction
When is Obturator Nerve block used?
Management of pain after lower limb surgery or for chronic hip pain
Where is the anaethetic injected in obturator nerve block?
How could the procedure be guided?
Inferior to the pubic tubercle and lateral to the tendon of the adductor longus muscle
Using an ultrasound