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Lecture 4

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KIN 427
Stuart Mc Gill

KIN 427 Lecture 4- January 17,2013 Anatomy Innervantion: - With injury nerves grow in the discs - tissue that is damaged is not always the cause of the pain, once damage occurs, the neuro sprouting changes and vascularize and put nerves into the site of damage and the person is better/ more able to feel the pain - specific lumbar roots serves different parts of the body - nerves also supply dermatomes and myotomes Section Summary: - Which tissues are innervated? - innervation changes with injury particulary to the disc - myotomes , dermatomes - help us to assess and understand Anatomy : Blood supply - discs once past outer periphery are avascular (until damaged) - vertebral body is bloody, and disc has no blood at all - veins and arteries enter and exit through the sinus at the back of vertebral body - underneath endplate is a placenta (membrane which nutrition and metabolites are taken up) - this placenta can be damaged (ie. ppl who have small compression fractures) - just like nerves sprouting vascular structures also grow into the disc if damaged (therefore more painful if damaged) vertebral veins: these veins have no valves - pressure fluctuates with IAP, ITP both transmitted to CNS fluid - walking etc beneficial? - what's the shock absorber of the spine are not disc (incompressible fluid and therefore the placenta bulges into the vertebral body and it is the trabecular bone that acts as a spring to absorb the shock) - viscous element and elastic (spring) element for shock absorbing - there are no valves in it but forces blood by pushing it out of hole (hole is tuned so that when it is pressurized blood is pushed out)→ control of extrusion against hole to not cause vertebrae to fracture Muscles: Isometric contraction occludes capillary bed - implications for prolonged isometric work and exercise - >5% of MVC - 6% of MVC compresses capillaries in biceps therefore it becomes acidic Section summary: Vascular - discs are avascular until injury - endplates are the placenta and are avascular until injury - valveless veins- describe the significance Anatomy of low back -Lumbar dosal fascia- criss-crossing facia pattern (tighten this belt wit bracing techniques of the abdominal walls and use it to push out) → (lats are also connected so may contribute to the high performance) - any action in the lateral wall tighens the LDF - this acts as a "retinactulum" as well for the low back muscles and holds muscles together from bulging - the abdominal hoop- ab. fascia and the LDF→ natures back belt→ heavy fascia in front of rectus abdominus and LDF→ passive components of the belt Latissimus dorsi: - special spine extensor and stabilizer - bend bar (push down with lats and external rotate→ can lift a lot more) - lat dorsi→ one of the best muscles to help get through sticking point (twisting action) Lats and Gluts (PNF) - transverse striations of the opposite gluts are in line with lats - bird dog→ lat dorsi and opposite glut - PNF connections recognize → combining gluts and lats for exercise= good Longissimus thoracis→ sending tendons all along spine and to the pelvis - what is the best extensor of the lumbar spine→ muscles that are way up that extend to the lower region→ they ave the longest wrench action→ most effective in extending the back (not actually the ones that lie in the
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