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Lecture Notes - F. Nov 29

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Kinesiology & Health Science
KINE 2031
All Professors

Lecture – November 29, 2013 Muscles Lower Limb Hip Flexor/adductors - Adductors muscle – origin pubic bone - They are flexors and adductors - Exception – Adductor Magnus Muscle o The short fibers will pass in front of the hip  flex the hip o Inferior fibers goes way down to the distal end of the femur  Extensors of the hip same as the hamstring muscles - Adductor magnus o Hip extensor o Lower fibers were they attach, its posterior to hip articulation - Power movements – functions of the muscles o Hip extension, knee extension, plantar flexion of the ankle o Preparation: Hip flexion, knee flexion and dorsal Flexion - Gluteal Muscles o Muscles involved in the back of the hip o They are involved in the extension of the hip o As I go into hip flexion, it gets a little bit longer – in order to generate more force, so when you start power movement you get more movement o Posterior definition o Glueteus maximus (superficial), gluetus medius (underneath), gluteus minimus (underneath) - Glueteus Maximus o Origin is the posterior crest of the illum and the sacrum o Runs down and inserts back of the femur o Lateral side of the knee– illotibial tract all the way down to the tibia o This muscle will pull back – contributes to the extension of the hip o Only involved in the power activity o 45 degree of flexion o Example, high running, lifting, cycling o When you are walking – very little gluteus maximus involved - Glueteus medius & gluteus minimus o Underneath the glueteus maximus o Origin the posterior crest of the illum and the sacrum o Runs straight down to insert on the top of the femur – greater trochanter o Primary function – abduction of the femur o Strong and powerful muscles o Example it would be used in, ballet, swimming (whip kick), kick boxing, ice skating o It’s not a power movement cause we don’t use it that much o When you shift from one leg, it should collapse, but it doesn’t because the gleuteus medius/minimus contracts and keeps the rest of the pelvis constant o Pelvic girdle stabilizers Hamstring muscles - Extensors of the hip - Biarticular - They cross the hip and the knee (back) - Powerful muscles - In terms of the power movement – involved in hip extension - Involved in flexion of knee (not power movement) - Origin (need to know) – iliac tuberosity - There are three of them o Two medial, one lateral o Semitendinous (medial) , semimembranosus (medial) and biceps femoris (lateral) o Has a long head and short head  Long head – origin common origin ischium passing down to the medial/lateral side  Short head – origin back of the femur and passes down o You can differentiate them quite easily - Semimembranosus – has membrane most medial - Semitendinous – feels like has the most tendons - Lateral side – biceps femoris Gracilis Muscle - Long muscle - Medial muscle on the thigh - Pubic crest to medial tibia - Only bi articular abductor Hip lateral Rotators - There is a whole bunch of them - Piriformis- Story o You find this a lot in dancers, cause they laterally rotate their femurs in the first position
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