Flashcards in Neck and oral cavity Deck (51)
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1
Boundaries and functions of the oral cavity
Boundaries:
Superiorly- Nasal cavity
Inferiorly- Pharynx
Functions:
- Digestion
- Speaking [manipulation of sound from the larynx]
2
Divisions of the tongue
Oral division
- Anterior 2/3
Pharyngeal
- Posterior 1/3
Terminal sulcus divided anterior from posterior.
Papillae
- Contains taste buds
- Except filiform
3
Frenulum
Under medial fold that separates the right side from the left side of the tongue.
4
Divisions of the oral cavity
Oral vestibule
- Space between the lips and cheek
Oral cavity proper
- Space enclosed by the teeth
5
Boundaries of the oral cavity proper
Roof
- Hard and soft palate
Floor
- Mylohyoid muscle
- Geniohyoid muscle
- Tongue
- Submandibular and sublingual glands
6
Intrinsic muscles of the tongue
- Function
Longitudinal
Transverse
Vertical
Function:
- Fine movement of the tongue
- Used for speech, eating and swallowing.
7
Extrinsic muscles of the tongue [4]
Genioglossus
Hyoglossus
Styloglossus
Palatoglossus
8
Genioglossus
- Shape
- Function
Extrinsic muscle of the tongue
- Fan shaped
- Arising from the mandible
Action
- Depression
- Protrusion
9
Hyoglossus
- Shape
- Function
Extrinsic muscle of the tongue
- From hyoid bone
- Vertical fibres
Action:
Depression
10
Styloglossus
- Shape
- Function
Extrinsic muscle of the tongue arising from the styloid process
- Downwards, forward fibres
Function:
Retraction
11
Palatoglossus
- Shape
- Function
Extrinsic muscle arising from the soft palate
- downward fibres
Function:
- Elevates back of the tongue
- Depresses soft palate
12
Innervation of the oral tongue
Special afferent [TASTE]
- Chorda tympani [from CN7]
- Lingual nerve [from mandibular nerve]
General sensation
- Lingual nerve
13
Innervation of the pharyngeal division of the tongue
Special afferent [TASTE]
- Glossopharyngeal [CN9]
Sensation
- CN9
Motor
- Hypoglossal [CN12]
- CNX [palatoglossus]
14
Innervation of the muscles of the tongue
CN12
- Hypoglossus
CN10
- Vagus
- Palatoglossus ONLY
15
Venous and arterial supply to the tongue
- Source
Lingual arteries and veins
- Branch from the ECA
16
Muscles of the soft palate
Palatoglossal and Palatopharyngeal
- Form the arches
Uvula
All depress the palate
17
Hypoglossal nerve
- Type
- Exit
- Innervation
CN 12
- Exits hypoglossal canal
Gives all motor supply to the tongue
- Except palatoglossus muscle
18
Clinical test for CN12 function
Patient is asked to protrude their tongue
- A deviation to one side may indicate impairment of CN12
19
CN 9
- Name
- Exit
- Type [4}
- Innervation [5]
Glossopharyngeal
- Exits jugular foramen
Type
- Somatic sensory [oropharynx and posterior 1/3 of the tongue]
- Special afferent, taste [post. third of the tongue]
- Visceral---> parotid gland
- Motor---> Stylopharyngeus
20
Larynx
- Function
- Border
Phonation
- Sits above the trachea
- Hyoid bone superior
Sphincter for the airway, blocks objects from entering trachea
21
Larynx cartilages + their functions [6]
- I see see see Three A Es
Thyroid
- Forms Adam's apple
- Connects to hyoid bone via ligament
Cricoid
- Forms inferior wall
- Connects to thyroid cartilage
Corniculate [paired]
- Apex of arytenoid
Arytenoid [paired]
- Alters vocal chords
Cuneiform [paired]
- anterior to corniculate
Epiglottis
- Elastic
- Blocks airway from food
22
Ligaments of the larynx
Vestibular
Vocal
23
Innervation of the larynx
Vagus nerve
- Recurrent laryngeal branch [motor]
- Superior laryngeal branch [sensory]
24
Arterial supply to the larynx
Upper half
- Superior thyroid [ from external carotid}
Lower half
- Inferior thyroid [ from thyrocervical trunk]
25
Pharynx divisions
- Surrounding anatomy
Pharynx [most posterior of neck]
- Behind oral cavity and nasal cavity
- Above oesophagus and larynx
Visions
- Nasopharynx
- Oropharynx
- Laryngopharynx
26
Muscles of pharynx
Superior, middle and inferior pharyngeal constrictor muscles
27
Innervation of pharynx
Motor
- CN X, Vagus
- Stylopharyngeus ---->
CN 9, Glossopharyngeal
Sensory
- CN V2 [maxillary]
- CN 9
- CN X
28
General motor supply of the vagus nerve
Palatoglossus muscle
Larynx and Pharynx muscles
29
Path of vagus nerve
Medulla--->
Jugular foramen [exit]-->
Carotid sheath --->
Head + thorax---->
Foregut and midgut
30
