Neurophys MCQs Flashcards
Which ONE of the following statements about the photoreceptors of the retina is CORRECT?
In the peripheral retina, rods are more common than cones.
With regard to the vestibular senses:
**The otolith organs can signal linear acceleration without significant adaptation.
Which of the following sensory parameters are topographically organised in their primary sensory cortex?
**B

The blood-brain barrier:
is produced by astrocytes and endothelial cells of the capillary wall.
Which ONE of the following statements about the functional organization of the brain is CORRECT?
The left cortical hemisphere generally controls the right side of the body.
Which ONE of the following statements about motor pathways is CORRECT?
The corticospinal tract crosses the midline.
With regard to image formation by the eye:
the cornea has greater optical power than the lens.
When preparing to reach down and pick up a bag, which brain area would be the final motor area to be activated before the movement begins?
Primary motor cortex
Which ONE of the following statements about the structure of the brain is CORRECT?
Connections between cortical areas are made by white matter tracts.
Which ONE of the following statements is CORRECT with regard to sensory receptors and afferents? Sensory receptors and afferents characterised as “rapidly adapting” or “phasic”:
generate more action potentials during changes in stimulus intensity than during steady stimulation.
With regard to the organisation of somatosensory cortex:
**The cortical representation of the hand is found near that of the face.
The traces below show action potential recordings from nine different peripheral afferent fibres. What was the likely movement of the stimulus relative to the finger?
**The stimulus was moved along the finger from tip to base.

Which ONE of the following statements about cerebro-spinal fluid (CSF) is CORRECT?
CSF is made at the choroid plexus.
Which ONE of the following statements is CORRECT with regard to the organisation of the spinal cord and peripheral nervous system?
Dorsal root ganglia contain the soma of sensory neurons.
With regard to spinal motor neurons:
The activity of an alpha motor neuron can be influenced by descending cortical input.
Choose the best option from the following table about spindle and Golgi tendon organ afferents.
A

Tactile sensory fibres with large receptive fields:
innervate body regions with low receptor densities.
In transducing mechanical energy into a neural signal, the cochlear hair cells:
utilise an influx of cations to depolarise the hair cell.
Choose the option that correctly assigns the roles of the outer, middle and inner ear.
**outer ear: modify sound based on location of source, middle ear: impedance matching, inner ear: sound transduction.
Which ONE of the following statements about the spinal cord is INCORRECT?
The spinal nerves have an organization where the sacral nerves tend to innervate the face, and the cervical nerves innervate the legs.
During normal voluntary muscle contraction (alpha and gamma co-activation):
**extrafusal fibres provide most of the contractile force.
A person who is unable to see things to the left side of where their gaze is directed has probably suffered damage to:
their right visual cortex (occipital lobe).
When a neuron adapts to a stimulus, this means that it:
generates action potentials at a lower rate.
Choose the CORRECT statement about the retina.
Rod photoreceptors outnumber cone photoreceptors throughout the retina except at the fovea.

