LMN paresis and paralysis – an introduction

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:

• Cell bodies in the ventral horn of the spinal cord

• Ventral nerve root

• Spinal nerve

• Neuromuscular junction

• Motor endplate

• Skeletal muscle.

Figure 43.1 Components of the LMN.

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).

Figure 43.2 The autonomic LMN.

Only gold members can continue reading. Log In or Register to continue

You may also need

Related

Tags: Saunders Solutions in Veterinary Practice Small Animal Neurology

Sep 3, 2016 | Posted by admin in SMALL ANIMAL | Comments Off

Premium Wordpress Themes by UFO Themes

WordPress theme by UFO themes