CNS Exam I Practice Questions fully solved & updated

The nervous system plays a dominant role in all body responses to internal and external demand EXCEPT? A. coordination B. integration C. contraction D. association - answer-C The central nervous system consists of two parts the brain or encephalon and the spinal cord or medulla spinalis, how many cranial nerve pairs are there? a. 24 b. 31 c.12 d. 62 - answer-c The somatic component of the nervous system or the voluntary component innervating skeletal musculature, what chemical is released by the somatic axon endings? a. excitatory b. Acetylcholine c. Norepinephrin d. Cholinergic - answer-b The autonomic or visceral component of the nervous system also known as the involuntary portion innervates which of the following musculature? a. smooth b. skeletal c. intrafusal d. extrafusal - answer-a The parasympathetic subdivision of the visceral component of the nervous system has neurons located in the CNS and PNS all of the following cranial nerves are present EXCEPT? a. VII b. XI c. IX d. X - answer-b In the sympathetic subdivision the preganglionic neurons release ACH and postganglionic sympathetics generally release norepinephrine what is the exception? a. connective tissue b. lymphatic vessels c. erectile tissue d. arrector pili muscles - answer-d There are many divisions in the nervous system therefore it is correct to assume that there are multiple nervous systems contained within the body. T or F - answer-F The third division of the known as the enteric or intrinsic system runs along the gut wall from esophagus to anal verge, what actions is this system best known for? a. contraction d. swallowing c. peristaltic reflexes d. constipation - answer-c the 3 primary brain vesicles are the prosencephalon, mesencephalon, and rhombencephalon, all of the following are further division of these structure except. a. neural crest b. mesencephalon c. diencephalon d. myelencephalon e. telencephalon - answer-a At birth the brain is 10% of the body weight and uses 60% of the oxygen, in the adult brain the brain is 2 % of the body weight and consumes______ of the body's oxygen. - answer-20% Protoplasmic Astrocytes are found in the grey matter and are generally unmyelinated. T or F - answer-T Fibrous astrocytes are generally found in the white matter and are also unmyelinated. T or F - answer-F Which of the following are known functions of astrocytes? a. Part of the BBB b. Store excess glucose c. Forming Scar-like tissue d. structural support of cells e. all of the above are true - answer-e The cell that transports CSF from the 3rd ventricle to the hypophyseal portal system? - answer-tanycytes What is the most common brain tumor? a. glioblastoma b. astrocytoma c. ependymoma - answer-b what is the most deadly brain tumor with a life expectancy upon diagnosis of 6 months? a. glioblastoma b. astrocytoma c. ependymoma - answer-a If a neuron is injured the nissel bodies respond quickly and appear to dissolve what is this process known as - answer-chromatolysis the myelinated portions of the axon are called internodes, between internodes there is a gap known as what? - answer-node of ranvier what is another name for dura matter or tough mother? - answer-pachymeninx what is the meningeal dura that forms a roof over the cella turcica called? - answer-Diaphragma sellae the largest cistern in the body is the? - answer-lumbar cistern the largest cerebral cistern is the? - answer-cisterna magna what are the most common reported sites for strokes? - answer-middle cerebral artery what artery is the site where the most anomalies occur? - answer-anterior communicating artery of the substances discussed in class what substance was related to parkinsons disease? a. Caffeine b. Alcohol c. Dopamine d. Nicotine - answer-c How does the CSF get into the DVS? - answer-arachnoid villi all of the DVSs converge in one area in the occipital region this area is known as? - answer-confluence of the sinuses how much of the bodies CSF is secreted by the choroid plexus? - answer-80%