Brain sp07

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Unformatted text preview: Dorsal Rostral Ventral Caudal Divisions of the Brain Divisions Brainstem Brainstem Medulla oblongata (1) (1) Pons (2) (2) Midbrain (3) (3) Diencephalon (4) Diencephalon Thalamus Thalamus Hypothalamus Hypothalamus 6 4 1 5 2 Epithalamus Epithalamus Cerebellum (5) (5) Cerebrum (6) (6) 3 Protection of the CNS Protection Structures that help to protect the brain and spinal cord: spinal Skull bones Skull Vertebrae Vertebrae Cerebrospinal Fluid (CSF) Cerebrospinal Bathes and cushions Bathes Meninges Meninges Three connective tissue membranes surrounding the brain and spinal cord surrounding Cerebrospinal Fluid Cerebrospinal Flows around and in the brain and spinal cord brain 99% water 99% Also sugar (glucose), chlorides, proteins, ions, vitamin C vitamin Total volume of 150 ml (replaced every 3 to 4 hrs.) (replaced 900 to 1200 ml formed daily 900 wastes Formed by choroid Formed choroid plexuses in the brain plexuses in ventricles ventricles ependymal cells capillary glucose, O2 ions choroid plexus Cerebrospinal Fluid Cerebrospinal produced by the choroid choroid plexuses of the ventricles Aids in maintaining the chemical environment of the chemical of CNS and the removal harmful chemical waste. harmful provides a protective buoyancy for the brain which buoyancy for effectively makes the weight of the brain 1/30th of its actual weight, actual The brain has four internal chambers called ventricles The lateral ventricles- two lateral ventricles, one in each cerebral lateral two hemisphere third ventricles- beneath the corpus callosum and third beneath and surrounded by the thalamus. fourth ventricle- between the hemispheres of the cerebellum. fourth Ventricles Ventricles interventricular foramen interve (Foramen of Monro)- tiny (Foramen Monro tiny passage that connects lateral ventricles to the third ventricle ventricles cerebral aqueduct (aqueduct of cerebral aqueduc (aqueduc Sylvius )- small canal that Sylvius small passes down the core of the core midbrain and leads to the the fourth ventricle (a small chamber between the pons pons and cerebellum Ventricles Ventricles central canal- extension central extension of the fourth ventricle through the medulla oblongata into the spinal cord. cord. Foramina of L...
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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