anatomy Ch15h - Human Anatomy McKinley & O'Loughlin...

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Human Anatomy Chapter 15: The Brain and Cranial Nerves Brain and Cranial Nerves Brain Development and Tissue Organization The Brain’s 4 Major Regions o Cerebrum, Diencephalon, Brainstem, and Cerebellum o The left and right cerebral hemispheres o Each hemisphere is subdivided into five functional areas called lobes. gyri (gyrus) sulci (sulcus) o The brain is associated with 12 pairs of cranial nerves. Directional Terms Applied to the Brain o Rostral – toward the nose = anterior o Caudal – toward the tail = posterior Organization of Brain Tissue o Gray matter o White matter o The cortex Organization of Brain Tissue o White matter lies deep to the gray matter of the cortex. o Cerebral nuclei
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Support and Protection of the Brain o The brain is protected and isolated by multiple structures. The bony cranium The meninges Cerebrospinal fluid (CSF) The blood-brain barrier Cranial Meninges o Three dense regular connective tissue layers that separate the soft tissue of the brain from the bones of the cranium o Cerebrospinal fluid o Parts of the cranial meninges form some of the veins that drain blood from the brain. o The cranial meninges are the dura mater, the arachnoid, and the pia mater. Dura Mater o Dura mater is composed of two layers. periosteal layer meningeal layer o The dural venous sinuses Arachnoid o Also called the arachnoid mater or the arachnoid membrane o The arachnoid trabeculae o The subdural space
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o The subarachnoid space Pia Mater o The innermost of the cranial meninges Cranial Dural Septa o Membranous partitions separate specific parts of the brain and provide additional stabilization and support to the entire brain. falx cerebri
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anatomy Ch15h - Human Anatomy McKinley & O'Loughlin...

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