BIOL 204 Study Guide - Midterm Guide: Squamosal Bone, Chondrocranium, Skull Roof
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Lab 3: compare + contrast embryonic origins of chondrocranium, dermatocranium, splanchnocranium. chondrocranium splanchnocranium dermatocranium, formed by mesenchyme, neural crest, mesenchyme of dermis neural crest cells, initially forms as cartilage, formes ventral, lateral and posterior region of braincase. In chondrichthyes, also forms dorsal region. cells: initially is cartilage, branchial arches and their derivatives. (derived from dermatome epimere mesoderm), dermal bone, forms dorsal surface of the braincase. Contributes to jaws and skeletal elements of mouth: only teleostomi have it. Foramina are located mainly in the sphenoids. They are the openings through which the cranial nerves exit the skull belongs. Identify which of the three components of the skull a given bone and/or cartilage. Splanchnocranium (mandibular arch): palatoquadrate, meckel"s cartilage, quadrate, articular, malleus, incus. Dermatocranium: premaxilla, nasal, maxilla, lacrimal, frontal, jugal, squamosal, parietal, interparietal. Chondrocranium: otic capsule, occipital, trabecular cartilage, ethmoid plate. in diff vertebrate taxa. Identify which structures of the skull are homologous and/or have similar function.
