Cranial Nerves 2 Flashcards
What are the cranial nerves of the medulla?
Glossopharyngeal
Vagus
Accessory
Hypoglossal
Describe the glossopharyngeal nerve
Mixed
Leaves the skull via the jugular foramen
SVA
GVA
GSA
SVE
GVE
Describe the SVA of the glossopharyngeal nerve
Taste from the post 1/3 of the tongue
Inferior ganglion
Describe the GVA of the glossopharyngeal nerve
Sensation from
post 1/3 of the tongue
Pharynx
Carotid sinus
(Inferior ganglion)
Describe the GSA of the glossopharyngeal nerve
Sensation from external
Superior ganglion
Enters the spinal trigeminal tract
Describe the SVE of the glossopharyngeal nerve
Branchial motor
Motor innervation to stylopharyngeus muscle from the nucleus ambiguus of medulla
Describe the GVE of the glossopharyngeal nerve
Parasympathetic innervation of parotid gland from inferior salvilatory nucleus of medulla
Describe the vagus nerve
Mixed nerve
Most extensive distribution
Extends throughout the neck, thorax and abdomen (colon)
Describe the SVA of the vagus nerve
Taste from epiglottis to solitary nucleus
(Inferior ganglion)
Describe the GVA of the vagus nerve
Sensation from
Abdominal organs
Heart / lungs
Pharynx , larynx
Oesophagus , trachea
Inputs from chemoreceptors in carotid body to monitor CO2
This goes to the cardio respiratory portion of the nucleus of the solitary tract
Describe the GSA of the vagus nerve
General sensation from
Pharynx , larynx
Oesophagus , trachea
External ear , external acoustic meatus
(Superior ganglion)
Nucleus spinal trigeminal tract
Describe the SVE of the vagus nerve
Branchial motor
Motor innervation to all pharyngeal and laryngeal muscles
(Not stylopharyngeus or tensor veli palatini)
From nucleus ambiguus medulla
Describe the GVE of the vagus nerve
Parasympathetic innervation from the dorsal motor nucleus to thoracic and abdominal viscera
Influenced by
Hypothalamus
Olfactory system
Reticular formation and
NTS
Dorsal nucleus located on vagal trione
Describe the accessory nerve
Motor
Arises from spinal accessory nucleus in posterolateral ventral horn of cervical spinal cord
Emerges from the spinal cord in lateral funiculus
Ascends to enter foramen magnum
Describe the SVE of the accessory nerve
Innervation to the sternocleidomastoid, trapezius and intrinsic laryngeal muscles