Anatomy of the Throat Flashcards
What are the sections of the oral cavity?
The oral cavity proper.
The oral vestibule (the section between lips and teeth)
What are the boundaries of the oral cavity?
Buccal mucosa
Stretches from the lips back to the glossopalantine arch (the first arch and where the uvula hang from)
And from the palate to the floor of the mouth
Explain the passage of the parotid duct?
It pierces the buccinator muscle then opens into the oral cavity on the inner cheek opposite the maxillary 2nd molar.
Explain the passage of the submandibular duct?
Lies superior to the digastric muscle.
Explain the structure of the submandibular gland?
Each one is divided into superficial and deep lobes separated by the mylohyoid muscle.
The superficial is the lobe below the mylohyoid, on the external surface
Which embryological structures form the tongue?
The ant 2/3rds from from the 1st branchial arch
The post 3rd forms from the 3rd branchial arch
Explain the innervation of the tongue:
The ant. 2/3rds are innervated by the lingual nerve which contains fibres from the:
- Mandibular division of the Trigeminal nerve carrying general somatic afferent innervation from the tongue
- Chorda Tympani branch of the facial nerve providing special (taste) sensation.
Post. 1/3rd is supplied by the Glossopharyngeal nerve (Cr N IX)
Describe the papillae of the tongue?
Comes in 4 types:
Filiform - very numerous but no taste buds
Fungiform - scattered on tongue dorsal surface
Folliate - Fairly Rudimentary
Circumvallate - In a row just anterior to the sulcus terminalis
What is the sulcus terminalis?
A V shaped groove that demarcates the junction of oral and pharyngeal portions of the tongue base.
What are the muscles of mastication?
Lateral & Medial Pterygoid
Temporalis
Masseter
What innervates the muscles of mastication and what do they do?
They act on the temporomandibular joint. Hinge it to open and close jaw and slide it to grind teeth from side to side.
Innervated by The mandibular division of the trigeminal nerve (V3 Cr N V)
Explain the muscle of the tongue
Split into intrinsic/extrinsic which alter the tongue shape & position respectively.
The extrinsic all end in -glossus
Genio-/Stylo-/hyo-/palato-
All the muscles of the tongue are innervated by the hypoglossal nerve (CN XII) except for the palatoglossal which is supplied by the pharyngeal plexus (CN 9/10)
What are the boundaries of the oropharynx?
Extends from the lower border of the soft palate to the upper border of the glottis.
Superiorly from the palatoglossal arch back to the posterior pharyngeal wall
Laterally it encloses the two arches (palatoglossal and palatopharyngeal) and the palatine tonsils in between.
What are the boundaries of the hypopharynx?
Extends from the sup border of the glottis to the lower border of the cricoid cartilage.
Its anterior wall is the posterior wall of the larynx
How do we divide up the hypopharynx?
Pyriform Fossa
Post Cricoid Area
Pharyngeal Wall
