The Brain
I. what does it do ?
a. maintains homeostasis, regulates basic bodily functions e.g. heart rate, resp rate etc.
b. The big integrator – coordinate sensory and motor
c. Coordinating motor output
d. Regulates generates drives – eat, drink, sex and sleep
e. Higher functions – memory, dreams, emotions, reasoning, personality etc.
II. Embryonic CNS development
b. Tel becomes cerebrum left and right hemispheres each has four lobes frontal, temporal, parietal, occipital
c. Di becomes epitihalamus, thalamus and hypothalamus
d. Mes becomes corpora quadrigemina – superior colliculi and inferior colliculi
e. Met cerebellum and pons
f. Myelin becames medutla
Medulla – ANS function VM
Pons – bridge between cerebellum and brain stem
Cercbellum coordinates complex motor activity involves sensory and learning.
Mes – super collicul visual reflex inferior auditory reflex
Di – epithalamus (pinealglanil) regulates rhythmic behavior secretes melatonin
Tel – sensory relay and fitter
Hypothamous master control of ANS and endro
I. Brain regions whole brain
Diencephalon
You need to be able to find
Optic nerves
Optic chiasm
Optic tracts
Hypothalamus (see picture below)
Infundibulum (see picture below)
MidbrainMesencephalon
Superior colliculi
Inferior colliculi
Cerebral peduncles
Hindbrain
Metencephalon
Cerebellum
Folia
Vermis
Pons
II. Meanings, ventriles and the flow of cerberospinal fluids
CSF is produced by the choroid plexus in the ventricles. 1
Arachnoid villus
Fluid movement
Dura mater (periosteal layer)
CSF flows from the third ventricle through the mesencephalic aqueduct into the fourth ventricle. 2
CSF in the fourth ventricle flows into the subarachnoid space by passing through the paired lateral apertures or the single median aperture, and into the central canal of the spinal cord.
(b) Arachnoid villus
3
Dura mater (meningeal layer)
As the CSF flows through the subarachnoid space, it removes waste products and provides buoyancy to support the brain.
4
Arachnoid
Subarachnoid space
5
Excess CSF flows into the arachnoid villi, then drains into the dural venous sinuses. Pressure allows the CSF to be released into the blood without permitting any venous blood to enter the subarachnoid space. The greater pressure on the CSF in the subarachnoid space assures that CSF moves into the venous sinuses.
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This page was last modified on Monday, July 09, 2007 11:45:33 AM