43 LMN paresis and paralysis – an introduction
The motor functions of the CNS are expressed through the lower motor neuron (LMN) (Fig. 43.1), which consists of:
Lower motor neuron cell bodies are also present within certain cranial nerve nuclei which supply skeletal muscles of the head region: muscles of facial expression, masticatory muscles, extraocular muscles, tongue, pharynx, larynx, and oesophagus. The visceral efferent (autonomic) supply to the salivary and lacrimal glands is also classed as a lower motor neuron as it connects the CNS to an effector organ (Fig. 43.2).
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