BIOLOGY 524 ADVANCED VERTEBRATE MORPHOLOGY (OSTEOOGY) STUART SUMIDA.

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Presentation transcript:

BIOLOGY 524 ADVANCED VERTEBRATE MORPHOLOGY (OSTEOOGY) STUART SUMIDA

Petromyzon, lamprey – jawless fish: axial skeleton, gill skeleton, partially developed cranial skeleton Perca, perch – gnathostome; cranial skeleton, axial skeleton, gill skeleton, appendicular skeleton.

Pelvic Limb and Gridle Pectoral Limb and Girdle Skull, cranial skeleton Axial skeleton

Drawing components parts of a skull:

ORIENTATION TO THE VERTEBRATE SKULL BRAINCASE- preformed in cartilage. Derived from both mesoderm and nerual crest. Forms a cradle for the brain, and throgh which major nerves and blood vessels pass. DERMAL SKULL COMPONENTS: DERMAL SKULL ROOF - A shield of intramembranously derived bone derived entirely from neural crest, covers over the top and sides of the head to protect the brain dorso-laterally. Extends down to rim of upper jaw and bears the marginal row(s) of teeth. Has openings for major sense organs (nose, eye, parietal eye). PALATAL COMPLEX – originally a plate or sheath of intramembranously derived bone derived entirely from neural crest, applied to the underside of the braincase to border he roof of the oral cavity. Parts of the mandibular components of the splnchnocranium (see below) come to be fused onto it. SPLANCHONOCRANIUM – structures associated with visceral (throat) skeleton and gill slits/pouches. Includes structures of the jaw and hyoid apparatus which come to be incorporated into skull structure. All components are endochondral in formation, and derived from neural crest tissue.

Braincase: internal cradle for the brain. Open from above. Dermal palate (and some components of mandibular arch of splanchnocranium) added. Dermal roof added in this view to see how it protects from above.