Anatomy Midterm 2 - Lecture 9.docx

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Michele Barbeau

Muscles of The Thorax, Back and Neck ­ rib cage ­ coming off of thoracic vertebrae are ribs ­ 12 ribs ­ articulate with vertebral column ­ wrap around anteriorly ­ ribs 1­7 articulate with costal cartilage o not calcified o similar properties to bone o not as firm as bone ­ ribs 1­7 are true ribs o articulate directly with sternum via costal cartilage ­ ribs 8­12 are false ribs o ribs 8­10 are costal ribs  articulate with costal cartilage too • not directly with sternum o ribs 11­12 are floating ribs  don’t articulate with anything  hanging in back  don’t articulate with anything ­ maintain internal organs o liver, spleen, stomach partially protected by floating ribs o lungs, heart fully protected ­ function is protection, also assists with breathing o muscles in between ribs assist ­ how vertebrae articulate with ribs ­ transverse process o articular surface  ­ head of rib o two surfaces that attach to articular surfaces ­ tubercle  o similar to process o not as pronounced o slightly raised area o has articular surface that attaches to transverse process ­ first rib is different o but rest of ribs have this general shape o more anteriorly have costal cartilage ­ nerves and blood vessels travel along costal groove for protection ­ rib 7 articulates  o superior facet with T6 o inferior facet with T7 o communication with rib and disc ­ when rib cthes forward, another articular spot with transverse process o 7  rib articulates with transverse process of T7 ­ tendon: bone to muscle ­ ligament: bone to bone o rich in collagen ­ ­ ribs come anteriorly and articulate with sternum ­ single bone made up of three fused bones o manubrium  square shaped o body of sternum o xiphoid process ­ hymelic maneuver o xiphoid process, two fingers up o want to push on body of sternum ­ jugular notch o off of manubrium ­ clavicle joins up at the top ­ manubrial sternal joint o at this point, that’s where the second rib joins up o more typical rib o good landmark, easy to fill ­ three main that help us breathe ­ intercostal – in between each rib ­ costal – ribs ­ the most exterior is the external intercostal muscle o originates in the inferior border of rib above it o fibers go down to superior border of rib below o when it shortens, it pulls up ­ the next two layers are internal intercostal muscle o originates from superior border from below o going to inferior border above o when it contratcs, it pulls rib down ­ next layer is innermost intercostal muscle o same as internal intercostal muscle o depresses muscle ­ nerve in yellow ­ artery in red ­ vein in blue ­ runs along intercostal groove ­ ­ along aoera, branches run along ribs ­ pop out at front to supply outer surfaces ­ nerves coming off spinal cord o ventral and dorsal rami o ventral go anteriorly  supply the fron
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