Topic 12 Brain lecture NO BACKGROUND

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

Info icon This preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 1

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

View Full Document Right Arrow Icon
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) What are brains made of? Jell-O... Mush Don’t know
Image of page 2
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?
Image of page 3

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

View Full Document Right Arrow Icon
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!
Image of page 4
Regions of the brain The brain is divided into three regions Cerebrum Cerebellum Brainstem composed of: medulla oblongata, pons, midbrain and diencephalon
Image of page 5

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

View Full Document Right Arrow Icon
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
Image of page 6
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
Image of page 7

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

View Full Document Right Arrow Icon
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
Image of page 8
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
Image of page 9

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

View Full Document Right Arrow Icon
The two hemispheres look mostly symmetrical, but have different functions This is known as lateralization Representational- Creativity Categorical - logic abilities
Image of page 10
The cerebral cortex is highly wrinkled.
Image of page 11

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

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern