Oral Cavity and Submandibular Gland Flashcards
Tongue surface anatomy
bOOK
Palate (seeable) surface anatomy
book
Oral Cavity Roof
Maxilla (palatine process), Palatine (horizontal plate) and Small part of sphenoid bone
Lateral wall
Oral mucosa, buccinator, skin
Floor of the oral cavity
Mylohyoid: Joins at midline raphe, posterolateral edge free. Mylohyoid line to hyoid bone Geniohyoid: Inferior mental spines Genioglossus: to Superior mental spines Hyoglossus Styloglossus Palatoglossus (ssus, extrinsic muscles)
Triangular aperture
Free edges of mylohyoid, superior and middle constrictor. Where vessles run
Tongue innervation
Hypoglossal nerve except Palatoglossus, vagus
Potential spaces in oral cavity floor
Between mylohyoid and hyoglossus: Lingual nerve (V3) thus chorda tympani, hypoglossal nerve, deep lingual vein Damage will be no tatse ant two thirds and sensation of floor gone
Hyloglossus and genioglossus: Glossopharyngeal and Lingual artery (from EC), Dorsal lingual vein. damage bleeding, post third of tongue taste gone
Submandibular Gland relations
To get to, must excise skin, subcutaneous fat, platysma and investing layer
duct from superficial part, terminates at sublingual papilla.
3 muscles nearby: mylohyoid, ant digastric and hyoglossus
Structures on it: Facial vein, artery and lymph nodes
Superficial part superficial to mylohyoid (near marginal mandibular nerve)
Deep part wraps around mylohyoid into the space, along with ^^. Sub lingual gland here too
Soft palate muscles
Tensor veli palatini (V3 innervates) Levator veli palatini Palatopharyngeus (palatopharyngeal arch) Palatoglossus (Palatoglossal arch) Musculae Uvulae
Lymphatic drainage
Lymph drains to areas 1 and 2
Presentation on marginal mandibular nerve
If damaged, first lip depressor contracts, lip will droop
Over time, lip elevators compensate,causing upper lip raise. Resting snarl face. When smile affected side, no lip depression
2cm line no good
two finger breadth rule good, misses MMN (34mm)
