Class Notes (836,580)
Canada (509,856)
Biology (2,256)
BIOL 371 (15)

biol 371 mt review partial.docx

3 Pages
Unlock Document

BIOL 371
Heidi Engelhardt

Module 2 – CNS - Development of Human CNS 1 o 4 weeks  Ant end of neural tube  three regions  forebrain, midbrain, hind brain o 6 weeks  Forebrain  Diencephalon  Cerebrum  Hindbrain  Pons  Oblongata  Medulla  Cerebellum o 11 weeks  Rapid growth of cerebrum o Birth  Cerebrum covers most of other brain region  Convoluted surface (growth in confined space) - Mammalian CNS surrounded by meninges - Organization of adult CNS o Protection  surrounded by bony cage, three layers of CT and CSF o Ventricles with CSF  2 lateral, 2 descending  extend to brain stem  CSF continuous with central canal of spinal cord o CSF secreted by choroid plexus  Provides ECF for neurons of CNS  Compared to blood, CSF -  LOWER K, Ca, HCO 3 glucose, pH, RBC, protein o Presence of RBC in CSF suggests infection  SIMILAR Na+  Reabasorbed into venous blood by arachnoid villi - Glial Cells of CNS o Oligodendrocytes  WHITE MATTER (myelin sheath within CNS) o Microglia -> Scavengers (phagocytic immune cell) o Astrocytes  regulate ECF via release of chemicals o Ependymal  create barriers - BBB o Lipid soluble molecules cross easily o Hydrophilic only if specific transporters/carriers are present  AA, Ions, peptide/proteins o Block drugs and stuff - Neural Tissue o Unable to switch to anaerobic metabolism  AEROBIC ONLY o O2readily crosses BBB o CNS capillaries express high level of glucose transporters o Brain  50% body glucose consumption  15% CO received  Dependent on blood flow (O and glucose) 2 - Spinal Cord o Major pathway between CNS & skin/joint/muscle o 4 regions, divided into segments  each segment has a pair of spinal nerves  White matter  myelintated axons  Tracts  bundles of axons connecting CNS regions  Grey matte
More Less

Related notes for BIOL 371

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.