Respiratory Flashcards
What makes up the upper respiratory tract?
Nasal cavity
Pharynx
Larynx
What makes up the lower respiratory tract?
Trachea
Primary bronchi
Lungs
What are the main functions of the nose in the respiratory tract?
Filtration
Defence- cilia take inspired particulates back to be swallowed
Warms and humidifes air
Describe the anatomy of the nose
Anterior nares open into enlarged vestibule which is lined with skin and stiff hairs
Turbinates double surface area
What are the 3 turbinates of the nose?
Superior meatus
Middle meatus
Inferior meatus
What are the 4 types of paranasal sinuses?
Frontal
Maxillary
Ethmoid
Sphenoid
They are pneumatised areas of these bones
They are evaginations of mucous membranes form the nasal cavity
Describe anatomy (location) of frontal sinuses
Within frontal bone
Midline septum
Over orbit and across superciliary arch
Supplied by ophthalmic division of nerve V
Describe anatomy (location) of maxillary sinuses
In body of maxilla
Pyramidal in shape
Base on lateral wall of nose
Apex at zygomatic process of maxilla
Roof is floor of orbit
Floor is alveolar process
Opens into middle meatus via hiatus semilunaris
Describe anatomy (location) of ethmoid sinuses
Between the eyes
Labyrinth of air cells (looks like honeycomb)
Drain into middle meatus by semilunar hiatus
Supplied by ophthalmic and maxillary nerve V
Describe anatomy (location) of sphenoid sinuses
Medial to cavernous sinus, carotid artery linked to C3-6
Inferior to optic canal, dura and pituitary gland
Empties into sphenoethmoidal recess, lateral to the attachment of nasal septum
Supplied by ophthalmic nerve V
What is the pharynx?
Fibromuscular tube lined with epithelium
Connects back of nose to larnyx
What is at the nasopharynx?
Eustachian tube enters into nasopharynx
Inferiorly at soft palate enters to oropharynx
Pharyngeal tonsils on posterior wall
Describe anatomy of oropharynx
Back of mouth, soft palate anterior to oro
Palatine tonsils on lateral walls
Inferior to hyoid bone
Palatoglossal folds
Palatopharyngeal folds
Describe the larynx (anatomy and function)
Valvular function
Prevents liquids and food from entering lungs
Rigid structure with 9 cartilages
Arytenoid cartilages rotate on the cricoid cartilage to change vocal cords
What are the single laryngeal cartilages?
Epiglottis
Thyroid
Cricoid
What are the double laryngeal cartilages?
Cuneiform
Corniculate
Arytenoid
Which nerves innervate larynx?
Vagus (CNX) splits into superior laryngeal nerve and recurrent laryngeal nerve
What is the role of the superior laryngeal nerve?
Provides sensation to larynx (internal) and supplies cricothyroid muscle (external)
What is the role of the recurrent laryngeal nerve?
Innervates all muscles in the larynx except cricothyroid
R and L have different courses
Left loops under aorta and ascends between trachea and oesophagus
Right: R subclavian artery, plane between trachea and oesophagus
What is a normal/average minute ventilation?
approx 5 litres
What is normal CO amount?
approx 5 litres
What is the size of the gas exchange surface of each lung (spread out)
20m^2
What are the main airways (biggest to smallest) in the lower resp tract?
Trachea
Main bronchi
Lobar bronchi
Segmental branches
Respiratory bronchiole
Terminal bronchiole
Alveolar ducts and branches
What is the structure of the trachea?
Runs from larynx to T5
Commences at cricoid cartilage
Oval in cross-sections, incomplete cartilages
Trachealis muscle joins incomplete circuit
Mobile
Sensory innervation from recurrent laryngeal nerve
Arterial supply from inferior thyroid artery