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skull shark
| Question | Answer |
|---|---|
| Rostrum | |
| rostral fenestra | open ventrally |
| epiphyseal foramen | just behind the rostrum on the top of the skull |
| otic capsule | back of skull just lateral to midline |
| orbit | |
| preorbital process | ridge at the front of the orbit |
| supraorbital crest | ridge at the top of the orbit |
| postorbital process | ridge behind the orbit |
| basal plate | large flat plate posterior section of the skull |
| vagal foramen | caudal section of the skull just lateral to foramen magnum |
| glossopharyngeal foramen | caudal section of the skull most lateral foramina |
| foramen magnum | canal for the spinal cord |
| occipital condyle | just ventral and lateral to foramen magnum articulate with the first trunk vertebra |
| branchial arches | basibranchials: center base hypobranchials: branch off basi- ceratobranchial: ventral rods posteriorly oriented epibranchial: curve dorsally from cerato- pharyngobranchial: terminates the arch dorsally |
| hyoid arch | basihyal: central section paired ceratohyal: lateral section posteriorly oriented paired hyomandibulae: lateral most projection terminates hyoid arch |
| meckel's cartilage | lower jaw skeleton |
| palatoquadrate cartilage | quadrate process: lateral immediately anterior to arches orbital process: projection nearest midline |
| homodont teeth |