Chapter 13 (4)
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Describe the sturucture and location of a choroid plexus.
- Consists of ependymal cells and capillaries.
- Found in all ventricles.
What are the three openings that allow CSF to flow into subarchnoid space?
- Median aperture
- Two lateral aperture
CSF is absorbed back into venous circulation through what?
CSF is absorbed back into venous circulation within what?
superior sagittal sinus
Describe the function of the Medulla oblongata.
- All communication (sensory and motor) between brain and spinal cord passes through.
- Center for coordination of relatively complex autonomic reflexes and control of visceral functions.
What is Decussation?
Crossing over of nerve fibers.
What do the pyramids of the Medulla oblongata contain?
descending motor tracts from cerebral cortex.
What autonomic functions does the medulla oblongata carry out?
- Cardiovascular centers -regulates heart rate and force of contraction
- Respiratory rhythmicity center -set the pace of respiratory movements
- Vasomotor centers-regulate distribution of blood flow
The pons links what?
Links cerebellum with midbrain, diencephalon, cerebrum, medulla oblongata, and spinal cord.
What is the function of the pons?
work with medulla to maintain basic rhythm of breathing.
What is the Cerebellum?
Is an automatic processing center that monitors proprioceptive, visual, tactile, balance, and auditory sensations.
What are the two major functions of the Cerebellum?
- Adjusting postural muscles.
- Programming and fine-tuning movements controlled at conscious and subconscious levels.
What is a Ataxia?
Disturbance of muscular coordination from trauma, stroke, or drugs such as alcohol.
Describe the structure of the cerebellum.
- Anterior and posterior lobes separated by primary fissure.
- Has two hemispheres that are separated by vermis.
- Surface of gray matter (cerebellar cortex).
- Contains huge, highly branched Purkinje cells that form many sensory and motor synapses.
- Has folds called folia.
What does the Cerebellar peduncles link?
Link cerebellum to brain stem, cerebrum, and spinal cord.
Describe the three cerebellar peduncles.
- Superior-communication between cerebellum and pons.
- Middle-link cerebellum with midbrain, diencephalon, and cerebrum.
- Inferior-sensory information from spinal cord and medulla.
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