List the four parts of the human brain.
Describe the number, location and function of the brain ventricles.
Label the ventricles.
Describe the brain meninges and the layers.
What is the function of the choroid plexus?
What is the blood-brain barrier and how is it maintained?
Describe the ce...
Question 1
The Brain
1.List the four parts of the human brain.
The human brain is made up of the cerebral hemispheres, diencephalon, brain stem, and cerebellum.
2.Describe the number, location and function of the brain ventricles.
There are four ventricles in the interior of the brain, chambers filled with cerebrospinal fluid which is produced there.
3.Label the ventricles. See figure in module.
4.Describe the brain meninges and the layers.
The meninges are three layers of connective tissue membranes that cover and protect central nervous system organs and enclose cerebrospinal fluid. The leathery dura mater is the double-layered outer meninx. The middle arachnoid meninx is a loose layer separated from the dura mater by the subdural space. Beneath the arachnoid meninx is the subarachnoid space which contains blood vessels and is filled with cerebrospinal fluid. The
inner pia mater meninx is a thin connective tissue tightly attached to the brain.
5.What is the function of the choroid plexus?
The choroid plexus produces cerebrospinal fluid.
6.What is the blood-brain barrier and how is it maintained?
The blood-brain barrier is a diffusion barrier which prevents most particles from entering the central nervous system tissue, keeping the brain and spinal cord separate from general
blood circulation. The blood-brain barrier is formed by the relatively impermeable brain capillaries, due to the glial cells astrocytes. Maintenance of the blood-brain-barrier is important to provide a stable chemical environment for the nervous system. A stable internal environment is important to protect neurons from chemical variations which could cause uncontrollable firing of neurons.
7.Describe the cerebrum.
The cerebrum, the foremost part of the brain, is the largest part of the brain in humans comprising about 83% of total brain mass 8.What is the median longitudinal fissure?
It separates the left and right cerebral hemispheres from one another.
9.Raised ridges on the cerebrum are called____. Gyri
10.The _______ separates the cerebrum from the cerebellum.
The transverse fissure
Question 2
The Brain
11.The outer portion of the cerebral hemispheres is called the ______and is highly convoluted and gray in color. Cerebral cortex
12.Describe the functions of the lobes of the cerebrum.
The frontal lobe controls higher level executive functions such as reasoning and decision making. The frontal lobe also controls motor functions and permits control over voluntary muscle actions. The parietal lobe receives sensory information from receptors in the mouth for taste and located in the skin, such as those for touch, pressure, and pain. The occipital lobe interprets visual input. The temporal lobe has sensory areas for hearing and smelling.
13.What is the difference between a primary area and an association area in the brain?
Primary areas in each lobe receive information for one type of sensory information. Association areas act mainly to integrate more than one type of sensory information for purposeful action.
14.Label the regions of the cerebral cortex.
See figure in module.
15.List the three major parts of the brain stem.
The brain stem is made up of the mid-brain, pons, and medulla oblongata.
16.How is the medulla oblongata involved with the heart and lungs?
The medulla oblongata regulates heartbeat and breathing
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