Obturator innervated muscles

1. What is the origin, insertion, and action of the adductor longus?
2. What is the origin, insertion, and action of the gracilis?
3. What is the origin, insertion, and action of the adductor brevis?
4. What is the origin, insertion, and action of the adductor magnus? What other nerve provides innervation to the adductor magnus?
5. What is the origin, insertion, and action of the obturator externus?
6. What other muscle is sometimes innervated by the obturator nerve?

Answers:
1. Adductor longus
Origin: Pubic tubercle
Insertion: Linea aspera of femur
Action: Adduct, flex thigh
2. Gracilis
Origin: Inferior ramus of pubis, ramus of ischium
Insertion: Proximal tibia
Action: Adduct thigh, flex leg, medial rotation of leg
3. Adductor brevis
Origin: Inferior ramus of pubis
Insertion: Pectineal line, proximal linea aspera
Action: Adduct, flex thigh
4. Adductor magnus
Origin: Inferior ramus of pubis, ramus of ischium, ischial tuberosity
Insertion: linea aspera, adductor tubercle of femur
Action: Adduct, flex thigh, extend thigh.
Other innervation: Sciatic nerve (posterior fibers)
5. Obturator externus
Origin: Obturator membrane
Insertion: Trochanteric fossa of femur
Action: Lateral rotation of thigh
6. Pectineus, which flexes and adducts hip.