Question

1. Trace the path of cerebrospinal fluid from where it is formed to where it is reabsorbed back into the blood.

2. Match each function with the appropriate area of the brain.

A. Basal nucleus                     C. Hypothalamus                    E. Precentral gyrus          G. Superior colliculus

B. Cerebellum                                     D. Inferior colliculus             F, Postcentral gyrus    H. Insula

______ Primary sensory area.

______ Suppress unwanted motor activity.

______ Involved in auditory reflexes.

______ Controls some endocrine functions.

3. How do the dural sinuses form?
4. Explain habituation.
5. Define the reticular formation in one sentence.
6. What is a common feature of cranial nerves III, IV, & VI?
7. What functions are usually attributed to the right cerebral hemisphere?

Answer 1

THE PATH OF CEREBRO SPINAL FLUID (CSF)

The flow of Cerebro Spinal Fluid (CSF) begins as it is made by the choroid plexus of the lateral ventricles(right & left) from fluid taken from the blood.It flows through the interventricular foramina into the third ventricle . More CSF is added by the choroid plexus of the third ventricle . The CSF exists the third ventricle through the cerebral aqueduct to enter the fourth ventricle.More CSF is added by the choroid plexus of the fourth ventricle.The CSF exists the fourth ventricle to enter the subarachnoid space via three foramina : median aperture and the lateral apertures In the subarachnoid space surrounding the spinal cord and cauda equina.The CSF is recycled back into the blood through arachnoid granulations mostly located along the superior sagittal sinus.

PRIMARY SENSORY AREA :

The postcentral gyrus is a prominent gyrus in the lateral parietal lobe of human brain.It is the location of primary somatosensory cortex, the main sensory receptive area for sense of touch.

SUPRESS UNWANTED MOTOR ACTIVITY :

During Basal ganglia disease the group of nuclei in the brain known as basal ganglia fail to properly supress unwanted movements

INVOLVED IN AUDITORY REFLEXES:

The inferior colliculus is the principal midbrain nucleus of the auditory pathway and receives input from several peripheral brainstem nuclei in the auditory pathway, as well as input from the auditory cortex.

CONTROLS ENDOCRINE GLANDS :

The Hypothalamus secretes several hormones that control pituitary glands.

Hope the above answer was clear and helpful.

Thanks.....