|
Year |
2001 |
|---|---|
|
Question Number |
206. |
|
Category |
Select |
Question
The arrow in the axial MRI scan shown in figure 63 is pointing to what muscle?
1- Gracilis
2- Adductor brevis
3- Sartorius
4- Semitendinosus
5- Pectineus
Figures
Answer (click for answer)
Answer 1.
Gracilis Muscle:
- origin:
- originates from pubic tubercle & inferior ramus of pubis;
- anterior aspect of lower 1/2 of symphysis pubis and medial of inferior
ramus of pubic arch; - insertion: pes arserinus
- action:
- adduction of thigh at the hip; flexion of the leg at the knee;
- medially rotates the femur and tibia;
- reversed origin insertion action: when the leg is fixed, the gracilis flexes
the pelvis at hip; - synergists: adductor brevis, adductor longus, adductor magnus, pectineus;
- nerve supply: obturator, L2, L3, L4.
Reference: Hoppenfeld S, deBoer P (eds): Surgical Exposures in Orthopedics: The Anatomic Approach, ed 2. Philadelphia, PA. JB Lippincott, 1994, pp401-429