Nervous System
What is the purpose of the optic chiasma?
To allow images from each eye to cross over to the other side of the brain prior to crossing back at the decussation of pyramids
To allow fibres from the medial aspect of one eye to join fibres from the lateral aspect of the other eye to form an optic tract
To allow the fibres from the lateral aspect of each eye to come together as an optic tract
To allow light entering the left eye to be interpreted by the right-hand side of the occipital lobe (and vice versa)
To allow fibres from the medial aspect of one eye to join fibres from the lateral aspect of the other eye to form an optic tract
The optic chiasma (crossing) allows the stimulation produced by light striking the rods and cones on the medial aspect of one eye to cross over to the other side of the brain to travel with the stimulation produced in the lateral aspect of the other eye. Hence some information from each eye is interpreted together in each side of the occipital lobe. In this way, binocular vision and the perception of distance are achieved.
To allow fibres from the medial aspect of one eye to join fibres from the lateral aspect of the other eye to form an optic tract The optic chiasma (crossing) allows the stimulation produced by light striking the rods and cones on the medial aspect of one eye to cross over to the other side of the brain to travel with the stimulation produced in the lateral aspect of the other eye. Hence some information from each eye is interpreted together in each side of the occipital lobe. In this way, binocular vision and the perception of distance are achieved.
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In the spinal cord, the ascending tracts contain:A. White matter and transmit sensory information
B. White matter and transmit motor commands
C. Grey matter and transmit sensory information
D. Grey matter and transmit motor commands
Which sequence of ion movements describes the action potential?
A. Na+ move out of cell then K+ move in
B. K+ move in to cell then Na+ move out
C. K+ move out of cell then Na+ move in
D. Na+ move into cell then K+ move out
Which of the following substances is prevented from entering the brain by the blood-brain barrier?
A. Glucose
B. Nicotine
C. Pharmaceuticals
D. Alcohol
There are three ossicles in the middle ear. What are their names?
A. Malleus, stapedius, otolith
B. Cochlea, stapes, incus
C. Stapedius, ampulla, cochlea
D. Malleus, stapes, incus
The inner ear (or internal ear) may be described as a series of tubes. What are the tubes filled with?
A. Air
B. Perilymph
C. Endolymph
D. Perilymph and endolymph
What characterises a spinal reflex?
A. It involves rapid processing by the brain and a predictable response.
B. It is a predictable, unlearned and involuntary motor response.
C. It is a rapid, predictable, learned and involuntary motor response.
D. It involves stimulation of a motor neurone by a sensory neurone that originates within the CNS.
A multipolar neuron has more than one of what?
A. Dendrite attached to the cell body
B. Axon attached to the cell body
C. Synaptic terminal attached to the axon
D. Cell body
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