Anatomy of Upper GI tract Flashcards
Name the types of papillae and describe their location.
Taste AND touch, temperature etc.:
Foliate papillae - sides of anterior tongue.
Vallate papillae - form V shape along terminal line between anterior 2/3rds and posterior 1/3rd
Fungiform papillae - singular papilla in centre of tongue.
Filiform papillae - tip of tongue, very sensitive (general senses only, NOT taste).
Describe the course of CN VII.
From Pontomedullary junction, travels through temporal bone via internal acoustic meatus then stylomastoid foramen.
What does CN VII supply?
Taste in the anterior 2/3rds of the tongue.
Muscles of facial expression.
Glands on the floor of the mouth.
Which cranial nerves innervate the oral cavity?
Superior half = CN V2
Inferior half = CN V3
Which cranial nerves control the sensory and motor aspects of the gag reflex?
Sensory part is carried by nerve fibres within CN IX (glossopharyngeal).
Motor part is carried by nerve fibres within CN IX (glossopharyngeal) and CN X (vagus).
Which cranial nerves will be affected by an anaesthetic used to numb the oral cavity?
CN V2, CN V3, CN VII, and CN IX.
Describe the boundaries of the oral cavity.
Anterior and lateral - teeth and gums
Superior - hard palate
Posterior - the opening into the pharynx
Basic summary of oral cavity innervation.
Superior half is innervated by CNV2.
Inferior half by CNV3.
CN VII supplies glands on floor of mouth.
Describe the anatomy of the parotid gland, the course of its duct into the oral cavity and its autonomic secretomotor innervation.
parotid - near ear.
duct crosses face and secretes into mouth by upper 2nd molar.
CN IX
Describe the anatomy of the submandibular gland, the course of its duct into the oral cavity and its autonomic secretomotor innervation.
submandibular - under mandible.
enters floor of mouth and secretes via lingual caruncle
CN VII
Describe the anatomy of the sublingual gland, the course of its duct into the oral cavity and its autonomic secretomotor innervation.
sublingual - under tongue.
layes in floor of mouth and secretes via lingual caruncle
CN VII
Describe the course of CN V2, and what is its name?
From pons
Through foramen rotundum
To sensory area (mid-face)
maxillary division of trigeminal nerve
Describe the course of CN IX and what is its name?
From medulla
Through jugular foramen
To posterior wall of oropharynx, parotid gland and posterior 1/3rd of tongue.
Glossopharyngeal nerve.
What is the name and course of CN VII ?
Facial nerve.
From pontomedullary junction.
Through temporal bone via internal acoustic meatus then stylomastoid foramen.
