Lecture Monday August 13

No need to memorize the structure of the lumbosacral plexus. Remember the following:
- femoral nerve (L2-L4)
- obturator nerve (L2-L4)
- tibial nerve (L4-S3)
- common fibulae nerve (L4-S2)


Compartmental organization of the thigh and leg (see handout on share point)


Cruciate ligaments of the knee (cross you middle finger over your index finger).
- Anterior prevents forward displacement of the tibia relative to the femur or prevents femur from moving posteriorly relative to a fixed tibia while standing.
- Posterior prevents posterior displacement of the tibia relative to the femur or prevents the femur from moving anteriorly relative to a fixed tibia while standing.


Gait can be very complex. Look at it as to what is happening at the hip, knee and ankle during a single cycle (heel strike to heel strike). For example, once you know that the ankle dorsiflexes, plantarflexes and dorsiflexes during one cycle then you can think about which muscle "groups" are active during each of those phases. Don't worry about memorizing the terminology. Just walk!


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