Oral Cavity Overview Flashcards
It is the area of suprahyoid neck below sinonasal region and anterior to oropharynx
Oral cavity
How is oral cavity seperated from oropharynx?
By soft palate, anterior tonsillar pillars and circumvallate papillae
Approach to oral cavity imaging is to consider 4 distinct regions. Which are?
- Oral mucosal space/surface
- Sublingual space (SLS): Non-fascial lined area superomedial to mylohyoid muscle
- Submandibular space (SMS): located inferolateral to myelohyoid
- Root of tongue: Made up of genioglossus-geniohyoid complex and lingual septum
Oral cavity regional relationships
Superior: Hard palate, maxillary alveolar ridge
Lateral: Cheek-buccal space
Inferior: Mylohyoid muscle (floor of mouth), mandibular alveolar ridge and teeth
Posterior: Soft palate, anterior tonsillar pillars, and lingual tonsil (tongue base)
Sublingual space (SLS) relationship
SLS in oral tongue between mylohyoid muscle inferolaterally and genioglussus medially
Both SLS communicate anterior beneath where?
Frenulum
Form “horizontal horsehoe” in deep oral tongue
Posteriorly SLS empties into where?
Into posterosuperior aspect of SMS and inferior parapharyngeal space
What fascia seperates posterior SLS from SMS and inferior PPS?
Direct communication allows spread of disease among these 3 spaces
It is a “vertical horseshoe” space between hyoid bone below and mylohyoid muscle sling above
Submandibular space
SMS communicates posteriory with what space?
With inferior PPS and posterior SLS
SMS continues inferiorly as what space?
Anterior cervical space
Inferiorly, root of tongue ends where?
At mylohyoid sling
Anterior, root of tongue where?
Mandibular symphysis
It is the anterior 3/4 of the tongue.
Oral tongue
It is the posterior 1/3 of tongue.
Base of tongue
What are the deep muscles of the oral tongue?
Genioglossus
Geniohyoid
Components of root of tongue?
Deep muscles of oral tongue (genioglossus and geniohyoid) + lingual septum
What are the intrinsic tongue muscles.
Genioglossus
Hyoglossus
Styloglossus
Palatoglossus
It is a large, fa-shaped muscle arising anteriorly from superior mental spine on inner surface of symphysis menti or mandible.
It inserts along entire length of under surface of tongue.
Genioglossus
Thin and quadrilateral shaped arising from body and greater cornu of hyoid bone.
It passes vertically upward to insert into side of tongue.
Hyoglossus
It forms the floor of the mouth.
Mylohyoid muscle
It seperates the lower oral cavity into submandibular space and sublingual space except along posterior margin.
Mylohyoid muscle
Mylohyoid muscle arises from where?
Mylohyoid line of the mandible
Where is the mylohyoid cleft?
At the junction of anterior 1/3 and posterior 2/3 of mylohyid muscle.
The mylohyoid cleft may be prominent with fat/vessels/ accessory salivary tissue
It lines the entire oral cavity included buccal (cheeks), gigival (gums), palatal and lingual surfaces.
Oral mucosal space
Most common locations of subepithelial collections of minor salivary glands.
Inner surface of lip, buccal mucosa, and palatal and lingual surfaces.
A small triangular shaped region of mucosa behind the last molar on mandibular ramus.
Retromolar trigone
It is the anatomical crossroads of oral cavity, oropharynx, soft palate, buccal space, floor of mouth, masticator space, and parapharyngeal space.
Retromolar trigone
Components of the sublingual space
- Lingual nerve
- Distal CN9 and CN12
- Lingual artery and vein
- Sublingual glands and ducts
- Hyoglossus muscle anterior margin projects into posterior sublingual space
- Deep portion of submandibular glan d and submandibular gland duct
