116 Lecture 5.S10

116 Lecture 5.S10 - CBNS 116 Lecture 5 - Ventricles,...

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ASSIGNMENT: Read Nolte Chapter 5: “Ventricles and cerebrospinal fluid”. This should be a relatively quick and easy read since the part of the chapter on imaging has already been assigned. FOR NEXT LECTURE: Read Nolte Chapter 10: “Spinal cord”. TODAY'S LECTURE: The big picture: The ventricles are the sites of production of cerebrospinal fluid (CSF), important for maintaining the shape of the brain through its partial flotation, providing a route for the distribution of neuroactive hormones through the nervous system, and for bathing the cells of the nervous system in an extracellular solution supporting their activity. The ventricles are significant clinically, as they provide important landmarks in brain images, and changes in their shape are symptomatic of certain conditions (such as from brain masses and degeneration of the basal ganglia). When obstructed, flow of CSF is attenuated which can lead to hydrocephalus , or “water on the brain”. I. Gross anatomy of the ventricles [slides 99-103]. There are 4 ventricles, or CSF filled spaces, in the brain. These are the paired lateral ventricles (originally named ventricles 1 and 2), the third ventricle , and the fourth ventricle . A. The lateral ventricles are the largest and are divided into several named subcompartments. 1) the anterior horn , the most rostral and medial part 2) the body , curving posterolaterally 3) the inferior horn , within each temporal lobe 4) the atrium , at the junction of the anterior horn and inferior horn 5) the posterior horn , extending posteriorly off the atrium The two lateral ventricles are separated by a thin midline sheet of connective tissue called the septum pellucidum (best seen in coronal section, slide 102). However, they do communicate anteriorly with the third ventricle via the interventricular foramen (of Monro) . The anterior horn and body of the lateral ventricles are bounded superiorly by the corpus callosum
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This note was uploaded on 10/31/2010 for the course CBNS 116 taught by Professor Todda.fiacco during the Spring '10 term at UC Riverside.

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116 Lecture 5.S10 - CBNS 116 Lecture 5 - Ventricles,...

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