L10 axial skeleton - Axial skeleton Notochord, vertebral...

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Axial skeleton Notochord, vertebral column, median fins, ribs, sternum Where do these tissues come from in the embryo?
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sclerotome dermatome myotome Vertebral column, ribs
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SOMITES VERTEBRA MUSCLES NERVES RIBS The nerves & muscles stay in register, vertebrae displaced half a somite – allows nerve out and muscles to span 2 vertebrae
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This relationship gives rise to dermatomes
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Neural arch (protection), intervertebral foramen (nerve exit), neural spine (muscle attachment), transverse process (attachment of rib), centrum
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Also in tail region of tetrapods hemal arch, hemal spines sometimes 2 centra per segment esp in tails of fish - diplospondyly
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What happens to the notochord? Can still be seen in fish and lower verts Becomes nucleus pulposus of discs in higher verts
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Shape of centra varies according to weight bearing. Fish – both concave, intervertebral pad allows movement Early terrestrial e.g. amphibians, ball & socket, resists dislocation
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Both surfaces flat with intervertebral disc – Bird cervical vertebrae – saddle-shaped
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Terrestrial verts – zygapophyses increase strength and resistance to twisting.
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This note was uploaded on 08/28/2011 for the course ZOO 3713c taught by Professor Staff during the Spring '08 term at University of Florida.

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L10 axial skeleton - Axial skeleton Notochord, vertebral...

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