Flashcards in Week 2 - Dry Room Deck (53):
The vestibule of the oral cavity refers to the space...
Between lips and cheeks superficially
Teeth and gingivae deeply
The muscle muscle innervated by the facial nerve that lies in the lateral walls of the oral cavity is?
The muscle of facial expression whose contraction causes closing/ pursing of the lips is?
The posterior opening of the oral cavity is called?
The oropharyngeal isthmus
What is the tongue?
What are its functions?
The tongue is a muscular organ covered by mucous membrane.
Its functions are:
-Moving food during chewing
How is the tongue divided?
It is divided into an anterior 2/3 and posterior 1/3 by a V shaped sulcus called the terminal sulcus
The anterior 1/3 of the dorsal surface of the tongue has surface projections of the mucous membrane that makes it rough.
What are they called?
What are the 3 types?
Taste buds are present in these surface projections except on the filiform type
The posterior 1/3 dorsal surface of the tongue has surface elevations produced by submucosal lymphoid tissue collection.
What is this called?
What covers the inferior surface of the tongue?
Smooth mucous membrane
What is the name of the fold of mucous membrane that fixes the tongue to the floor of the mouth?
What provides general sensory innervation to the anterior 2/3 of the tongue?
Lingual nerve = branch of mandibular division of the trigeminal nerve
What provides taste sensation to the anterior 2/3 of the tongue?
Chorda tympani branch of the facial nerve
What provides general sensory innervation to the posterior 1/3 of the tongue?
Glossopharyngeal (IX) Nerve
What provides taste sensation to the posterior 1/3 of the tongue?
Glossopharyngeal (IX) nerve
What are the two types of muscles of the tongue?
Intrinsic muscles that originate and insert within the tongue
Extrinsic muscles that attach from the tongue to surrounding bones or soft palate
On a sagittal section of the tongue which specific area are the intrinsic muscle fibres mainly concentrated?
Inner surface of the body of the mandible
What do the extrinsic and intrinsic fibres of the muscles of the tongue do?
Extrinsic = change position of the tongue
Intrinsic = change the shape of the tongue
Name the 4 extrinsic muscles of the tongue
What is the attachment and action of the genioglossis?
-Inner surface of the mandible close to the midline
-Protrudes tongue to the opposite side
What is the attachment and action of the hyoglossus?
-Upper border of body of mandible
What is the attachment and action of the styloglossus?
-Retrudes tongue and curls its sides
What is the attachment and action of the palatoglossus?
-Elevation of posterior tongue
What nerves supply the intrinsic and extrinsic muscles of the tongue?
ALL muscles supplied by hypoglossal nerve (Cr. N. XII)
-Palatoglossus (Vagus nerve)
Name the 3 large paired salivary glands
Parotid salivary gland
Submandibular salivary gland
Submental salivary gland
What is the nerve supply of the 3 salivary glands?
Parotid = glossopharyngeal nerve
Submandibular and submental = chorda tympani from the facial nerve
The roof of the mouth is made up of the bony hard palate, posterior to which is the soft palate.
What two bones form the hard palate?
Palatine process of maxillae
Name the 5 muscles in the soft palate
Tensor veli palatini
Levator Veli Palatini
What is the nerve supply to the muscles of the soft palate?
Branch of mandibular division of facial nerve
Pharyngeal branch of vagus via pharyngeal plexus
What is the collective action of the muscles of the soft palate?
Seal off oral passage from nasopharynx
Seal off oral cavity from nasal passage (breath through nose while mouth is open)
What structures do the palatoglossus and palatopharyngeal muscles form in the mouth?
What lies between these structures?
Palatopharyngeal arch posteriorly
Palatoglossal arch anteriorly
What is the pharynx?
The pharynx is a fibromuscular tube that is important in swallowing (to direct food into the oesophagus) and in breathing (to direct air into the larynx)
What are the 3 parts of the pharynx?
What forms the roof of the nasopharynx?
Partly vommer and claris also
In relation to the larynx the laryngopharynx lies...?
What prevents food entering the nose during swallowing?
What prevents food entering the larynx during swallowing?
What are the 3 layers of the pharynx?
Outer muscular layer
Middle fibrous layer
Inner muscular layer
What is the structure of the outer muscular layer of the pharynx?
Outer circular layer and inner longitudinal layer
Outer circular layer (3 constrictor muscles)
Inner longitudinal layer
What is the structure of the middle fibrous layer of the pharynx?
Merges with the deep fascia of the muscles and fills in gaps between muscles
What innervates the pharynx?
-Sensory = Cr. N. IX
-Motor = Vagus
What is Waldeyer's ring?
Pharyngeal lymphoid ring = collection of lymphoid tide that protects the entrance into the oropharynx
What is the function of the larynx?
Larynx = voice box (produces sound)
Protective inlet to the respiratory system
Which structures are the larynx continuous with superiorly and inferiorly?
Superiorly = pharynx
Inferiorly = trachea
Which cartilage of the larynx forms the "adam's apple" in males?
Which cartilage of the larynx is paired?
Which cartilage of the larynx is a complete ring?
What type of connective tissue forms the spaces between the laryngeal cartilages?
Dense connective tissue
Which laryngeal membrane lies inferior to the vocal cords?
Why is it important to know this?
Due to its position inferior to the vocal cords, this membrane is sometimes pierced in emergency situations when acute swelling of the vocal cords causes stridor (anaphylactic reaction)
What structures form the laryngeal inlet?
The lumen of the larynx is divided into 3 parts.
What are they?
The vestibule, or upper part, is the area between the laryngeal inlet and the vestibular folds (or false vocal cords)
The middle part lies between the vestibular folds and the (true) vocal cords (laryngeal ventricle)
The lower part extends from the vocal cords to the lower border of the cricoid cartilage
What is the function of the vocal cords?
What muscles allow this?
The vocal folds are important in voice production.
Intrinsic muscles of the larynx control movement of the vocal fold as well as controlling the diameter of the laryngeal inlet.
What is the nerve supply of the intrinsic muscles of the larynx?
Recurrent laryngeal nerve.
Except for the CRICOTHYROID MUSCLE.
This muscle is supplied by the superior laryngeal nerve, also a branch of the vagus nerve.