6,273
edits
Changes
Jump to navigation
Jump to search
Cranial Nerves - Anatomy & Physiology (view source)
Revision as of 15:12, 11 August 2011
, 15:12, 11 August 2011→Glossopharyngeal nerve (IX)
<br />
<br />
<br />
<br />
The glossopharyngeal nerve is composed of many fibre types including '''general somatic efferent fibres''' that innervate the stylopharyngeus muscle; the '''general visceral afferent fibres''' that provide sensory information from the carotid body, the pharynx and the middle ear; the '''general visceral efferent fibres''' that provide parasympathetic innervation to the parotid and zygomatic salivary glands; the '''special visceral afferent fibres''' that provide taste caudal to the tongue and finally the '''general ssomatic afferent fibres''' that provide sensory information from the external ear.
The glossopharyngeal nerve is composed of many fibre types including '''general somatic efferent fibres''' that innervate the stylopharyngeus muscle; the '''general visceral afferent fibres''' that provide sensory information from the carotid body, the pharynx and the middle ear; the '''general visceral efferent fibres''' that provide parasympathetic innervation to the parotid and zygomatic salivary glands; the '''special visceral afferent fibres''' that provide taste caudal to the tongue and finally the '''general somatic afferent fibres''' that provide sensory information from the external ear.
<br />
<br />
The '''lingual branch''' of the glossopharyngeal nerve provides '''general somatic afferent fibres''' and '''special visceral afferent fibres''' to the caudal 1/3 of the tongue.
<br />
<br />
On clinical examination, choking or dysphagia as a result of malfunctioning or abscent pharyngeal reflexes would indicate a problem with the glossopharyngeal nerve.
===Vagus nerve (X)===
===Vagus nerve (X)===
The vagus nerve is part of the group of cranial nerves responsible for innervation of structures derived from the branchial arches. It is also part of a group together with the glossopharyngeal and accessory nerves that passes through the '''jugular foramen''' which is termed the '''vagus group'''. The vagus nerve has '''general somatic efferent fibres''' and has cell bodies that are referred to as '''nucleus ambiguus'''.
The vagus nerve is part of the group of cranial nerves responsible for innervation of structures derived from the branchial arches. It is also part of a group together with the glossopharyngeal and accessory nerves that passes through the '''jugular foramen''' which is termed the '''vagus group'''. The vagus nerve has '''general somatic efferent fibres''' and has cell bodies that are referred to as '''nucleus ambiguus'''.