Respiratory Flashcards
What are the four groups of sinuses?
Frontal
Maxillary
Ethmoid
Sphenoid
Where do the frontal sinuses drain into?
Middle meatus through infundibulum
Where do the maxillary sinuses drain into?
Middle meatus through hiatus semilunaris
Where do the ethmoid sinuses drain into?
Anterior - infundibulum of middle meatus
Middle - Middle meatus
Posterior - superior meatus
Where do the sphenoid sinuses drain into?
The sphenoethmoidal recess (this lies above the superior concha)
What are the contents of the carotid sheaths?
Common carotid artery
Internal jugular vein
Vagus nerve
Cervical lymph nodes
What is the name of the part of the nasal cavity that is just inside the nostrils?
Nasal vestibule
What are the names of the three bones located in the nose?
Superior, middle and inferior conchae
What is the area beneath each of the conchae called?
Meatus (superior, middle & inferior)
What is the area superior to the superior conchae called?
Sphenoethmoidal recess
What is the nerve supply to the nasal cavity?
Smell - olfactory nerves
Sensation - Branches of V1 and V2 of trigeminal nerve
What is the arterial supply to the nasal cavity?
Branches of the maxillary artery (a branch of the external carotid artery)
What is the lymph drainage of the nasal cavity?
Vestibule end - submandibular nodes
Remainder - Upper cervical nodes
What are the paranasal sinuses lined by?
Mucoperiosteum - compound structure of mucous membrane and underlying periosteum (membrane that lines all bones)
How is the mucous in the sinuses drained?
1) Through cillary action of columnar cells
2) Siphon action through blowing of the nose
What are the functions of the paranasal sinuses?
1) They act as resonators to the voice
2) They reduce the weight of the skull
What are the three parts of the pharynx?
Nasopharynx
Oropharynx
Laryngopharynx
What is the location of the nasopharynx?
Above the soft palate and behind the nasal cavity
What is the name for the opening between the sodt palate and the posterior pharyngeal wall?
Pharyngeal isthmus
Where is the oropharynx located?
Behind the oral cavity down to the epiglottis - it is formed by the posterior third of the tongue
What are the two arches located on the lateral walls of the oropharynx?
Palatoglossal and palatopharyngeal arches (or folds)
What lies between the arches in the oropharynx?
Palatine tonsils
What is the name for the boundary between the mouth and the pharynx?
Oropharyngeal isthmus - this is the section between the two arches
Where is the laryngopharynx located?
Behind the opening of the larynx
What is the name for the depression either side of the laryngeal inlet?
Piriform fossa
What is the innervation of the nasopharynx?
Maxillary nerve (V2)
What is the innervation of the oropharynx?
Glossopharyngeal nerve
What is the innervation of the laryngopharynx?
Internal laryngeal branch of the vagus nerve
What are the pharyngeal constrictor muscles?
Superior, middle and inferior
What is the inferior pharyngeal constrictor muscle split into?
Thyropharyngeus (superior section)
Cricopharyngeus (inferior section)
What are the three paired cartilages in the larynx?
Arytenoid cartilages
Corniculate cartilages
Cuneiform cartilages
What are the single (unpaired) cartilages in the larynx?
Thyroid cartilage
Cricoid cartilage
Epiglottis
What is the epiglottis made of?
Elastic cartilage
The epiglottis has attachments at its side, what are they?
Aryepiglottic folds - they attach the epiglottis to the arytenoid cartilages
Where is the stalk of the epiglottis attached to?
Thyroid cartilage
What are the membranes and ligaments of the larynx?
Thyrohyoid membrane Hyo-epiglottic ligament Cricotracheal ligament Cricothyroid ligament Quadrangular membrane
What are the attachments of the quadrangular membrane?
Spans between the antereolateral arytenoid cartilage and the lateral aspect of the epiglottis
Note: Lower margin becomes thickened - vestibular ligament
What are the vestibular folds also known as?
False vocal cords
Are the vestibular folds located above or below the true vocal cords?
Above
what is the role of the false vocal cords?
To provide protection to the larynx
What is the epithelial lining of the larynx?
Respiratory epithelium (except for the true vocal cords)
What is the epithelial lining of the true vocal cords?
Non-keratinised stratified squamous epithelium
What is the structure of the true vocal cords (folds)?
Superficial to deep: Epithelium Reinke's space - water layer Vocal ligament Vocalis muscle
What do the vestibular folds consist of?
The vestibular ligament
What are the two groups of extrinsic muscles that act of the larynx?
Suprahyoid and infrahyoid muscles
What (as a general rule) do the suprahyoid muscles do?
Elevate the larynx
What (as a general rule) do the infrahyoid muscles do?
Depress the larynx
What are the intrinsic muscles of the larynx?
Cricothyroid Thyroarytenoid Posterior cricoarytenoid Lateral cricoarytenoid Transverse and oblique arytenoids
What does the cricothyroid muscle do?
Stretches and tenses the vocal ligament
What does the thyroarytenoid muscle do?
Relaxes the vocal ligament
What does the posterior cricoaryntenoid muscle do?
Abducts the vocal folds
What does the lateral cricoarytenoid muscle do?
Adducts the vocal folds
What do the transverse and oblique arytenoids do?
Adduct the arytenoid cartilages
What vertebra does the larynx span?
C3-C6
What are the three divisions of the larynx?
Supra glottis
Glottis
Subglottis
What is the location of the supraglottis?
Inferior surface of epiglottis to vestibular folds
What is the location of the glottis?
Below vestibular folds and contains vocal cords and 1 cm below
What is the location of the subglottis?
Inferior border of the glottis to the inferior border of the cricoid cartilage
What is the space between the vocal cords called?
Rima glottidis
What is the arterial supply to the larynx?
Superior laryngeal and inferior laryngeal arteries
What is the superior laryngeal artery a branch of?
Superior thyroid artery
What is the inferior laryngeal artery a branch of?
Inferior thyroid artery
Where does the superior laryngeal vein drain to?
Internal jugualr vein via the superior thyroid vein
Where does the inferior laryngeal vein drain?
To the left brachiocephalic vein via the inferior thyroid vein
What provides sensory innervation to the infraglottis?
Recurrent laryngeal nerve
What supplies sensory innervation to the supraglottis?
Internal branch of the superior laryngeal nerve
What innervates the internal muscles of the larynx?
Recurrent laryngeal nerve (except cricothyroid)
What innervates the cricothyroid muscle?
External branch of the superior laryngeal nerve
What is the thyroid gland composed of in terms of structures?
Two lobes
An isthmus connecting the two lobes
Where would the pyramidal lobe be located if it is present?
As an upwards projection from the isthmus
What is the arterial supply of the thyroid gland?
Superior and inferior thyroid arteries
What additional artery can be present to supply the thyroid gland?
Thyoidea ima
What is the superior thyroid artery a branch of?
External carotid artery
What is the inferior thyroid artery a branch of?
Thyrocervical trunk - a branch of the subclavian artery
Where can the thyroidea ima arise from?
Brachiocephalic artery or arch of the aorta
What are the veins that drain the thyroid artery?
Superior, middle and inferior thyroid veins
Where does the superior thyroid vein drain?
Into the internal jugular vein
Where does the middle thyroid vein drain?
Internal jugular vein
Where does the inferior thyroid vein drain?
Brachiocephalic vein
What are the main hormones produced by the thyroid gland?
Thyroxine (T4)
Triiodothyronine (T3)
Calcentonin
What cells in the thyroid gland produce calcetonin?
C-cells (aka Parafollicular cells)
What vertebra does the thyroid gland span?
C5-T1
Why is the thyroid gland so highly vascularised?
It secretes its hormones directly into the blood, a good vasuclar supply means the hormones can be quickly flushed from the gland and be taken around the body
What is the first stage of swallowing? is it voluntary?
It is a volutary process.
The bolus of food is pushed to the roof of the mouth and then backwards by he tongue against the hard palate.
This involves the styloglossus muscle
What is the second stage in swallowing? is it voluntary?
It is involuntary.
The soft palate elevates (contraction of the palatoparyngeus) and the posterior wall of the pharynx moves forward (contraction of superior constrictor).
The larynx is then elevated causing the epiglottis to shut off the larynx (contraction of stylopharyngeus, salpingopharyngeus, thyrohyoid & palatopharyngeus)
What is the third stage of swallowing? is it voluntary?
It is involuntary.
The bolus of food moves down over the epiglottis into the oesophagus through successive constriction of the constrictor muscles.
Where does the azygous vein drain into?
Superior vena cava
What does the accessory hemiazygous vein drain?
Superior left hemithorax
What does the hemiazygous vein drain?
9th-11th posterior intercostal veins and left subcostal vein (plus some oesophageal veins)
What are the three groups of ribs?
True ribs
False ribs
Floating ribs
How many true ribs are there? Which ones?
7 (1-7)
How many false ribs are there? Which ones?
3 (8-10)
How many floating ribs are there? Which ones?
2 (11 and 12)
What is the angle of louis?
AKA sternal angle
Formed between the junction of the manubrium and the body of the sternum
What is the midsternal line?
A line running down the middle of the sternum