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Lecture 20

BIOL 240 Lecture 20: MARCH 12

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BIOL 240

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MARCH 12 , 2017 Major parts of brain - Cerebrum - Diencephalon - Brainstem - Cerebellum Embryonic development - Starts off as a cube, then develops forebrain, midbrain, and hindbrain - When each portion of 3 types brain going to develop into adult brain structures o Forebrain Cerebrum Most of the weight in brain Diencephalon o Midbrain Midbrain o Hindbrain Ponds Medulla oblongata Cerebellum - Medulla oblongata, ponds, and midbrain are going to form the brain stem - Adult structures are coming from forebrain, midbrain, and hindbrain Major and specific regions of the brain - Cerebrum - Cerebellum - Diencephalon o Thalamus o Epithalamus o Hypothalamus - Brainstem o Midbrain o Pons o Medulla oblongata Cranial Meninges (layers covering the brain) 3 layers in total - Dura mater o Outer periosteal layer against bone Holding brain to the bone o Forms during venous sinuses draining blood from brain o Supportive structure formed by dura mater o Very tough membrane, providing support o Divided into Periosteal layer To bone Meningeal layer
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