Topic 12 Brain lecture NO BACKGROUND

Topic 12 Brain lecture NO BACKGROUND - Topic 12 Lecture...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Topic 12 Lecture outline Some fun facts Division and function of component parts of the brain Protective roles of meninges, CSF and cranial bones Homeostatic disturbances The Brain - is wider than the Sky - For - put them side by side - The one the other will contain With ease - and You - beside- The Brain is deeper than the sea - For - hold them - Blue to Blue - The one the other will absorb - As sponges - Buckets - do The Brain is just the weight of God - For - Heft them - Pound for Pound - And they will differ - if they do - As syllable from Sound - Emily Dickinson (1830-1886) W h a t a r e b r a i n s m a d e o f ? Jell-O... Mush Dont know FUN FACTS! Average number of neurons in the human brain 100 billion Rate of neuron growth during development of a fetus 250,000 n/minute Longest axon of a neuron - around 15 feet Giraffe primary afferent axon from toe to neck Guess what? There are more nerve cells in the human brain than there are stars in the Milky Way. What if we lined up all the neurons in our body? How long would that line stretch? Let's assume that one neuron is about 10 microns long. Remember, this is just an example, because neurons come in all different sizes. So, if we line up 100 billion neurons which are 10 microns long . . . 100,000,000,000 neurons x 10 microns= 1000 km/about 600 miles! Regions of the brain The brain is divided into three regions Cerebrum Cerebellum Brainstem composed of: medulla oblongata, pons, midbrain and diencephalon In the spinal cord Central cavity - central canal Gray matter - surrounds the cavity, internal to white matter White matter - external to gray matter Location and distribution of gray and white matter Location and distribution of gray and white matter In the brain Additional gray matter Surface layer: outer cortex in the cerebral hemispheres and cerebellum Stellate cells with dendrites projecting in all directions Pyramidal cells with axon that passes out of the area Deeper masses of gray matter: nuclei in other structures Basal nuclei involved in movement Projection tracts vertical from brain internal capsule and corona radiata Commissural tracts cross L to R corpus callosum Association tracts Long - connect lobes Short - connect gyri within one hemisphere Location and distribution of gray and white matter Cerebrum Largest part of the brain Consists of two cerebral hemispheres Hemispheres are separated externally by longitudinal fissure Hemispheres are connected internally by corpus callosum Associated with higher brain function = thought, language, reasoning...
View Full Document

This note was uploaded on 06/02/2011 for the course PSYC 1101 taught by Professor Yanchus during the Spring '07 term at Georgia Southern University .

Page1 / 35

Topic 12 Brain lecture NO BACKGROUND - Topic 12 Lecture...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online