1/28/09 Notes - 1/28/09 Head Skeleton: 3 Parts...

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1/28/09 Head Skeleton: 3 Parts Chondocranium o Underlying support for brain o Begins as cartilage o “floor” Splanchnocranium: o Originated as pharyngeal skeleton o Cartilaginous arches (may ossify) o Support gills Jaws Dermatocranium: o Dermal bone o Almost completely encases brain and jaws in reptiles and mammals o Lacking in sharks Hyomandibular (transmitting sound) stapes Because of the changes in jaw articulation, the articular malleus and the quadrate incus , now used for sound transmission All 3 (stapes, incus, malleus) appear in mammals “One intelligent (IQ) morning (AM) the fish hyomandibular became the frog stapes. Chordates- Notochord Vertebral column: support o Composed of vertebrae o Separate bones of cartilages w/ cushions
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Intervertebral discs- in between Vertebra: o Neural arch: around nerve cord o Centrum o Hemal arch: blood vessels o Various processes for articulation o Appear first in evolution as ventral elements along nerve cord- arcualia
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This note was uploaded on 02/14/2009 for the course ZOL 328 taught by Professor Hill during the Spring '08 term at Michigan State University.

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1/28/09 Notes - 1/28/09 Head Skeleton: 3 Parts...

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