The Vertebrate Skull:
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Transcript of The Vertebrate Skull:
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The Vertebrate Skull:Introduction and Development
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The Vertebrate SkullIntroductionIntroduction
Before we begin…
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Gastrulation and mesoderm
Key Embryonic Structures
The Vertebrate SkullReviewReview
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Neurulation and neural crest
Key Embryonic Structures
The Vertebrate SkullReviewReview
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Basic vertebrate body plan
Key Embryonic Structures
The Vertebrate SkullReviewReview
Branchial/pharyngeal arches
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Hyaline cartilage
Key Tissues
The Vertebrate SkullReviewReview
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Bone
Key Tissues
The Vertebrate SkullReviewReview
Endochondral vs. dermal
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Chondrocranium
3 Subdivisions of the Skull
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Chondrocranium
3 Subdivisions of the Skull
The Vertebrate SkullReviewReview
Splanchnocranium
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Chondrocranium
3 Subdivisions of the Skull
The Vertebrate SkullReviewReview
Splanchnocranium
Dermatocranium
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Chondrocranium
3 Subdivisions of the Skull
The Vertebrate SkullReviewReview
Splanchnocranium
Dermatocranium
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Chondrocranium
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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Prechordal, parachordal, somitic mesoderm
Chondrocranium
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
ChondrocraniumOf Chondrichthyans
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Tetrapods – 5 paired and 4 unpaired bones arise from chondrocranium
Chondrocranium
• Reptiles and Birds have a single occipital condyle. • Amphibians and mammals have paired occipital condyles.
Note: Occipital series (minus supra-) forms joint with first cervical vertebra:
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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Why form a chondrocranium?
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Splanchnocranium
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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Splanchnocranium1st branchial arch cartilages
2nd branchial arch cartilages
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SplanchnocraniumPrimitive design
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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SplanchnocraniumChondrichthyans
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SplanchnocraniumTetrapods
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Dermatocranium
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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DermatocraniumNeural crest
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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DermatocraniumNeural crest formation and migration
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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DermatocraniumNeural crest derivatives
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
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Tetrapods
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
Dermatocranium
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Major bones
The Vertebrate Skull3 Divisions of the skull3 Divisions of the skull
Dermatocranium