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5.1 Which key properties of neurons allows them to combine to form a nervous system?
A Excitability and communicability
5.2 What two main types of synapse are there and how do they differ?
A Chemical - neurotransmitter
Electrical - direct ion passage
5.3 What is the role of myelin in the nervous system?
A Permits faster (saltatory) conduction of impulses
5.4 How does the vascular endothelium in the CNS differ from that of most other tissues?
A Not fenestrated, prevents passage of blood components
5.5 The ventral and dorsal spinal nerve roots carry fibres in which directions?
A Ventral efferent, dorsal afferent
5.6 Which hormones are produced in the posterior pituitary?
A None – the posterior pituitary is only the site of release of hypothalamic hormones.
5.7What are the organs that provide communication between skin and muscles?
A Sensory end organs (capsulated and unencapsulated) in skin, and motor end plates in muscle.
5.8 Both produce a myelin sheath but how do Schwann cell differ from oligodendroglial cells.
A Each Schwann cell only myelinates a single segment of an axon, an oligodendrocyte can myelinate segments of several different axons.
5.9 How is a peripheral nerve fascicle protected from external influences?
A By the perineurium. The cells in this are connected to form a continuous sheath. This acts as a diffusion barrier, protecting the contents