Nervous System

    Nervous System
    What does the ciliary muscle do when accommodation (focussing) in the eye occurs?
    The ciliary muscle is doughnut-shaped with the lens in the “hole” and attached to the muscle by ciliary fibres (zonules). When the ciliary muscle contracts, it moves towards the lens which allows the ciliary fibres to reduce their tension so that the lens is stretched less. Hence it oozes to a more rounded shape.
    Author: rikazzz Comment
    Nervous System
    Which structure(s) contain axons that connect the two hemispheres of the brain?
    The corpus callosum is one of the commissural tracts that connect the left and right hemispheres. Projection fibres enter the hemispheres from lower brain areas or the spinal cord, while association fibres connect different parts of same hemisphere.
    Author: rikazzz Comment
    Nervous System
    What part of the neurone carries the “action potential”?
    The action potential travels along the axon, away from the cell body.
    Author: rikazzz Comment
    Nervous System
    If the term “cholinergic” is applied to a synapse, what does it mean?
    Cholinergic (or adrenergic) refers to the neurotransmitter acetylcholine (or adrenaline/noradrenalin = epinephrine/norepinephrine) that is released at the synapse.
    Author: rikazzz Comment
    Nervous System
    The change in vision that occurs with ageing is called:
    “Presby-” means elderly or old. Choices A and C refer to forms of “colour blindness”.
    Author: rikazzz Comment
    Nervous System
    What is the name of the nerve cell structure that carries incoming impulses towards the cell?
    Dendrites receive incoming (efferent or stimulating) impulses.
    Author: rikazzz Comment
    Nervous System
    One of the following is not a meninx. Which one?
    Alma mater is the university that you attended.
    Author: rikazzz Comment
    Nervous System
    Which of the following is true of anaxonic neurons?
    Choice B would be true of unipolar neurons. Choice C would be true of multipolar neurons. Choice D is true, but A is a better answer as it is more specific.
    Author: rikazzz Comment
    Nervous System
    Which of the following auditory structures are filled with fluid?
    The cochlea and the three semi-circular canals of the inner ear are filled with fluid.
    Author: rikazzz Comment
    Nervous System
    Of the following lists of four anatomical features, which one has the correct order of the path taken by sound energy as it is transmitted through the ear?
    The tympanic membrane (ear drum) is the first structure. The ossicles pass on the vibrations to the oval (not round) window of the cochlea.
    Author: rikazzz Comment