Nervous System

    Nervous System
    What and where is the precentral gyrus?
    The precentral gyrus of the frontal lobe is the primary motor area.
    Author: rikazzz Comment
    Nervous System
    What statement is true about spinal reflexes?
    A spinal reflex does not involve processing by the brain. However they can be inhibited or reinforced by the brain. Some are polysynaptic.
    Author: rikazzz Comment
    Nervous System
    Which of the following describes an “action potential”?
    Choice B describes a graded potential. Choice C describes synaptic transmission. Choice A describes the distribution of those ions that contribute to the resting potential.
    Author: rikazzz Comment
    Nervous System
    What sort of information does an afferent nerve pathway carry?
    “Afferent” implies information travelling towards the brain, therefore sensory information. A corticospinal tract is descending.
    Author: rikazzz Comment
    Nervous System
    In which region of the eye does the most detailed vision occur? The:
    The fovea centralis is at the centre of the macula lutea. The optic disc is insensitive to light.
    Author: rikazzz Comment
    Nervous System
    The ossicles of the ear pass on sound vibrations to the fluid in the inner ear. In what structure is this fluid located?
    The cochlea contains the scala vestibuli and the scala tympani, both of which are filled with perilymph. It also contains the cochlear duct filled with endolymph.
    Author: rikazzz Comment
    Nervous System
    Which of the following roles is NOT performed by the hypothalamus?
    The thalamus relays visual and auditory information, not the hypothalamus.
    Author: rikazzz Comment
    Nervous System
    Through which structure must sound pass in order to enter the middle ear?
    Sound travels from the air in the outer ear to the middle ear by vibrating the tympanic membrane (the ear drum). Sound enters the cochlea (inner ear) via the oval window.
    Author: rikazzz Comment
    Nervous System
    Which glial cells are responsible for forming the myelin sheath around peripheral nerve cells?
    The oligodendrocytes perform a similar function for neurones within the CNS.
    Author: rikazzz Comment
    Nervous System
    What fills the posterior chamber of the eye?
    The vitreous humour (or body) fills the space between the lens and the retina. It is transparent and gel-like, being about twice as viscous as water at 37 °C. “Humour” is an ancient Latin term for liquid or juice from a plant or animal. Aqueous humour fills the eye’s anterior chamber.
    Author: rikazzz Comment