Anatomy Of Oral Cavity Flashcards
What separates the oral cavity into 2 regions
Upper and lower dental arches
Name muscles forming floor of mouth
Mylohyoid, geniohyoid and tongue
What is the origin and insertion and function as well as innervation of mylohyoid muscle FFQ
0:Mylohyoid line on mandible
I: medially- fibrous raphe, as well as hyoid bone
A: provide structural support to the floor of oral cavity, participates in the elevation and pulling forward the hyoid bone and therefore the larynxin the
Initial stages of swallowing
In: A branch of inferior alveolar nerve - the nerve to mylohyoid
FFQ geniohyoid muscle origin, insertion, action and innervation
0: inferior mental spines of mandible
I: body of hyoid bone
A: pull hyoid bone and therefore the larynx up and forward during swallowing
In:
What is the lateral walls of the oral cavity?
- Cheeks→ muscular and merge anteriorly with the lips surrounding, the oral fissure
- each cheek → consist a layer of skeletal muscle sandwiched between skin externally and oral mucosa internally→Buccinator muscle
FFQ origin, insertion etc of Buccinator muscle
0: Pterigoid raphe, alveolar processes of Maxillar and mandible
I: orbicularis oris
A: to hold cheeks againts alveolar arches to keep food between the teeth when chewing
In: buccal branch of facial nerve, sensation from buccal branch trigerminal nerve of mandibular part
Name the parts of the posterior Aperture of the tongue
- Orophargngeal isthmus
2. Opens into the oral part of the pharynx (oropharynx)
Namer functions of the tongue
= speech
= taste
=mastication
=swallowing
What part of the tongue is fixed and what is mobile
Mobile # anterior 2/3
Fixed # Posterior 1/3 - forms anterior border of oropharynx
Name the papillae of the Tongue
# Circumvallate papillae # Filiform papilla # Foliate papilla # Fungiform papilla
Does the pharyngeal surface of the tongue have - papillae
No
Explain the pharyngeal surface of the tongue
The mucosa covering the pharyngeal surface of the tongue is irregular in contour because of the many small nodules of lymphoid tissue = lingual tonsil
Namer the extrinsic muscles of the tongue
- Palatoglossus
- Styloglossus
- Hyoglossus
- Genioglossus
Namer the intrinsic muscles of the tongue
- Longitudinal
- transverse
- vertical
What is the blood supply of the tongue
- lingual artery (branch of external carotid artery)
What is the venous drainage of the tongue
Drains to internal jugular vein
What is the motor innervation of the tongue
All tongue muscles innovated by hypoglossal nerve (except palatoglossus muscle)
What gives sensory (pain and temp) innovation to tongue
Anterior 2/3= lingual nerve (branch o t V3)
Posterior 1/3= glossophargeus nerve
What provides sensory (taste) inneruation to tongue
Anterior 2/3= facial nerve
Posterior 1/3= glossophargngeus nerve
What is the course of the lingual nerve FFQ (part I)
Remember the lingual nerve is a sensory branch of the posterior division of the mandible division of the trigeminal nerve
→ the lingual nerve divides off the posterior division and descends anterior to the inferior alveolar nerve to course between the lateral pterygoid and tensor
Veli palatine muscles and then medial pterygoid muscle and the mandible, contracting the internal surface of the mandible at the posterior margin of the
Mylohyoid line.
Course of lingual nerve part (2)
→ running anteriorly it passes lateral to the styloglossus and hyoglossus muscles and has small sensory branches that supply the floor of the mouth and the mandibular lingual gingival.
Courser of lingual nerve (part 3)
The nerve continues anteriorly passing from lateral to medial under the submandibular duct and then enters the lateral margin of the mid tongue to supply sensation to the anterior two-thirds of the tongue
