Neuroscience Week 6: Gustatory Flashcards
Identify
Identify
Gustatory pathway ganglia
3 listed
- Geniculate ganglion
- Petrosal ganglion
- Nodose ganglion
Geniculate ganglion associated nerve
Facial nerve
Petrosal ganglion associated nerve
Glossopharyngeal nerve
Nodose ganglion associated nerve
Vagus nerve
Gustatory pathway
Primary: geniculate, petrosal, nodose ganglia
↓
Secondary: Solitary nucleus tract
↓
Tertiary: VPN (Ventral posteromedial nucleus) nucleus of the thalamus
↓
Primary: gustatory area at the frontal operculum and insula
Identify
Identify
oral muscle innervated by Vagus nerve
Palatoglossus
Palatoglossus is innervated by?
Vagus nerve
All muscles of the tongue are innervated by? With exception to?
- Hypoglossal nerve
- Palatoglossus which is innervated by Vagus nerve
Palatoglossus action
posterior elevation for swallowing
Hypoglossus innervation
hypoglossal nerve
hypoglossus action
retracts and depresses the tongue
Genioglossus action
protrudes the tongue
Genioglossus innervation
hypoglossal nerve
Styloglossus innervation
Hypoglossal nerve
Styloglossus action
drives the sides of the tongue upwards
which nerve provides general sensation of the anterior 2/3 of the tongue?
Trigeminal nerve (lingual nerve)
which nerve provides special sensation of the anterior 2/3 of the tongue?
Chorda tympani of the facial nerve
which nerve provides general sensation of the postterior 1/3 of the tongue?
Glossopharyngeal nerve
which nerve provides special sensation of the posterior 1/3 of the tongue?
Glossopharyngeal nerve
Taste sensation involvement of facial palsy
loss of taste of the anterior 2/3 of the tongue through LMN lesion
Tongue development
Identify Innervation
Identify arches
The genie sticks out his?
- Tongue
- Genioglossus (protrudes tongue)
Identify function and innervation
Identify Nucleus
Identify afferent and efferent
Identify Reflex
Taste disorders
3 listed
- Ageusia
- Hypogeusia
- Dysgeusia
Taste disorders are most commonly caused by?
Impaired smell
Taste disorders common causes
6 listed
- Drug-induced (anti-hypertensives, antibiotics, most CNS drugs)
- Gastroesophageal reflux disease (metallic taste in the morning)
- Oral disease (e.g. candidiasis)
- Radiotherapy for head and neck cancers
- Damage to peripheral nerves: middle ear infections or ear surgery can damage chorda tympani, third molar extraction can damage lingual nerve (containing fibers CN V and VII)
- aging
Aguesia
Ageusia is the loss of taste functions of the tongue, particularly the inability to detect sweetness, sourness, bitterness, saltiness, and umami
Hypoguesia
is a reduced ability to taste things (to taste sweet, sour, bitter, or salty substances). The complete lack of taste is referred to as ageusia. Causes of hypogeusia include the chemotherapy drug bleomycin, an antitumor antibiotic as well as zinc deficiency.
Dysgeusia
also known as parageusia, is a distortion of the sense of taste.
