36. With respect to the cells of the retina:
a. the horizontal cells form the anatomical basis of lateral
inhibition
b. the amacrine cells are an homogenous population of cells
c. the amacrine cells contribute to centre-surround characteristics
of
ganglion cells
d. interplexiform cells are both pre- and post-synaptic to amacrine
processes and can synapse on amacrine cell
bodies
e. the interplexiform cells are associated with the phasic reponse
of
ganglion cells
f. Muller cells act as a store for calcium
37. The autonomic nervous system:
a. can be divided into somatic and automatic
b. has control centres in the thalamus and brainstem
c. has myelinated preganglionic fibres and unmyelinated
postganglionic fibres
d. has cell bodies of preganglionic neurones in the medial grey horns
of the spinal cord
e. is similar to the somatic nervous system, in that they are
both
based on reflex arcs
f. can be divided into sympathetic and unsympathetic parts
38. The neurotransmitters involved in the autonomic nervous system:
a. are all inactivated by reuptake into the preganglionic neurone
b. include acetylcholine acting on nicotinic receptors at the
postsynaptic junction in both the sympathetic and
parasympathetic
systems
c. include acetylcholine acting on nicotinic receptors at the
presynaptic junction in both the parasympathetic
and sypathetic
systems
d. include acetylcholine acting on muscarinic receptors at the
postsynaptic junction in the sympathetic and parasympathetic
systems
e. include acetylcholine acting on muscarinic receptors at the
postsynaptic junction in the parasympathetic system
f. include serotonin released into the presynaptic junction in the
sympathetic system
39. The medulla:
a. is part of the hindbrain
b. is the most rostral part of the brainstem
c. lies on the floor of the cranial cavity
d. is attached to the cerebellum via the middle cerebellar peduncles
e. contains the exit of cranial nerves III, IV & VI
40. With respect to the internal tracts of the medulla:
a. the corticospinal tract is associated with control of crude,
unskilled movements
b. the corticospinal tract lies anterolaterally to form the olives
c. 75-90% of corticospinal tract fibres decussate in the caudal
medulla
d. 10-25% of corticospinal fibres descend ipsilaterally and do not
cross
e. the rubrospinal tract is involved in control of limb flexor tone