BIOL 204 Lecture 2: Lecture 2
Document Summary
Embryonic germ layers: ectoderm, mesoderm, endoderm, medial region of mesoderm gives rise to notochord, notochord- flexible rod that provides structural support. Fate of mesoderm in adult vertebrates: mesoderm; gives rise to many structures including many regions of the skeleton, most muscles, the notochord, and the circulatory system. Fate of ectoderm in adult vertebrates: ectoderm; gives rise to the epidermis and many skin glands, as well as the nervous system and many sensory organs. Fate of endoderm in adult vertebrates: endoderm; produces the lining of the digestive tract, as well as a variety of other structures, including the liver, pancreas, gall bladder, digestive glands, lungs, swim bladders, and urinary bladder. Neurulation in the frog: neurulation; formation of neural tube. Differentiation of mesoderm into 3 regions: after gastrulation is complete, the mesoderm differentiates into epimere, mesomere, Hypomere: emimere mesoderm further differentiates into dermatome, myotome and sclerotome. Vertebrate egg types: little yolk- microlecithal, ex: amphioxus, moderate yolk- mesolecithal.
