Back for Test 1 (Emily) - } There is no int er ver tebral...

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Unformatted text preview: } There is no int er ver tebral disc between Atlas & Axis VERTEBRAE & MUSCLES OF THE BACK VERTEBRAL COLUMN Axial Skeleton: Forms the basic structure of the trunk. It consists of 33-34 vertebrae and intervertebral disks. There are 7 cervical, 12 thoracic, 5 lumbar, 5 sacral and 4-5 coccygeal vertebrae in human. Remember : 7am Breakfast 12pm Lunch 5pm Dinner Intervertebral Discs: Between the vertebrae Made of fibrocartilage Composed of : o (2) Nucleus pulposus : soft jelly-like nucleus inner sphere Gelatinous Acts like a rubber ball enabling the spine to absorb compressive stress Remnant of the Notochord , embryonic tissue o (1) Anulus Fibrosus : ( fibrous ring ) Outer collar of about 12 concentric rings Outer rings consist of ligament and the inner rings consist of fibrocartilage Contains the nucleus pulposus (limits its expansion when spine is compressed) Binds the vertebrae together, resists tension on the spine & absorbs compressive forces Collagen fibers in adjacent rings in the annulus cross like an X to allow spine to withstand twisting Functions : o Absorb shock o Assures no friction between the bones o Facilitate the movements of the vertebral column . Thickest in the lumbar and cervical regions (enhances the flexibility of these regions) Make up 20-25% of the height of the vertebral column (youre shorter when you go to bed than when you wake up-due to loss of fluid from the gelatinous nucleus pulposus) Flexibility of discs decreases with time (why you shrink as you grow older) * Herniation : occurs mostly posterolaterally where the Anulus Fibrosus is thinner o AKA herniated discs or prolapsed discs or commonly slipped discs o Caused by : severe or sudden physical trauma (ex: lifting a heavy object) Aging is a factor because nucleus pulposus loses its cushioning properties over time o Resulting pressure on nerve roots causes pain or numbness Curvatures of the Vertebral Column: Increase the resilience of the spine (functions like a spring as opposed to a straight rigid rod) Cervical & Lumbar curvatures : concave (curve in, hollow inward) posteriorly Thoracic & Sacral curvatures : convex (curve out, bulge outward) posteriorly Development of Curvatures : o Only the thoracic & sacral curvatures are well developed at birth. PRIMARY curvatures (1 ) Convex posteriorly Kyphotic curve...
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This note was uploaded on 01/28/2011 for the course HSC 3733 taught by Professor Dr.mohtashemsamsam during the Spring '10 term at University of Central Florida.

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Back for Test 1 (Emily) - } There is no int er ver tebral...

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