Sciatic Nerve

SCIATIC NERVE
- ORIGIN
  - Union of roots in front of piriformis muscle
    - The lumbosacral trunk from the L4 and L5 roots
      - descends between the sacral promontory and ala
    - and the S1 to S3 roots emerge from the ventral sacral foramina
- COURSE
  - EXIT OF PELVIS
    - passes beneath piriformis through greater sciatic foramen
  - THIGH
    - travels down the posterior thigh to popliteal fossa
    - travels in posterior compartment of thigh
      - superficial to adductor magnus muscle
      - deep to long head of biceps femoris muscle
    - Just above popliteal fossa
      - divides in to two terminal branches
        
        The tibial nerve,
        
        travels down the posterior compartment of the leg into the foot
        
        The common fibular nerve (also called the common peroneal nerve),
        
        travels down the anterior and lateral compartments of the leg into the foot
  - POPLITEAL FOSSA