Anatomy Flashcards
What are the main functions of the nose?
- Breathing
2. Ofalction
What is the role of the Conchae/Turbinates?
- Used to increase the surface area.
2. Used to warm and humidify air. As it produces turbulent flow
What is below the conchae?
Meatus.
What is the role of the Meatus?
Its where the paranasal sinuses drain into via ostias.
What are the four paranasal sinuses?
- Frontal
- Sphenoid
- Ethmoid
- Maxillary
What are the two main arteries which supply the internal nose?
Sphenopalatine artery ( from the maxillary)
Ethmoidal artery. ( from the ophthalmic)
What is the main nerve supply for the internal nose?
Maxillary branch of the trigeminal nerve.
Where does the lymph vessels drain into from the internal nose?
First drains into submandibular node then the deep cervical nodes.
What are the three sections of the pharynx (throat) ?
- Nasopharynx (posterior to nasal cavities)
- Oropharynx ( posterior to oral cavity)
- Laryngopharynx ( posterior to larynx)
Where does the pharynx extend to?
From the base of the skull to the inferior border of the cricoid cartilage.
What does the nasopharynx contain?
contains opening of the eustachian canal (auditory tube)- this equalises pressure.
Contains adenoids.
What muscles surround the pharynx?
- superior constrictor muscles
- Middle constrictor muscles
- Inferior constrictor muscles
What arteries supply the muscles surrounding the pharynx?
Pharyngeal,facial and lingual arteries.
What nerves supply the pharynx?
The pharyngeal plexus ( Cranial nerves IX and X)
What is the venous drainage for the pharynx?
Plexus of veins from the outer surface of the pharynx to the internal jugular vein.
What nerve supplies the nasopharynx?
Maxillary nerve ( cranial nerve V)
Where does the lymph drain into from the pharynx?
Vessels drain directly into deep cervical lymph nodes.
What bone is the larynx connected to?
U-shaped hyoid bone
What does the cartilaginous skeleton of the larynx consist of?
- Epiglottis
- Thyroid cartilage
- 2 Arytenoid cartilages ( posterior)
- Cricoid Cartilage
What are the three main functions of the larynx?
- Open valve, to allow air to pass when breathing.
- Protection of the trachea and bronchi during swallowing
- Speech production
What external muscle of the larynx attaches to the thyroid membrane and cartillage?
Cricothyroid
How do internal muscles of the larynx protect the lungs?
By sphincter action.
Which arteries supply the larynx?
Superior and inferior laryngeal arteries
What nerve supplies the larynx?
The vagus nerve ( Cranial X)
Internal branch of the superior laryngeal nerve supplies the mucosa of the larynx.
External branch supplies the cricothyroid muscle.
The recurrent laryngeal nerve supplies the mucosa below the vocal cords and all the intrinsic muscles apart from the cricothyroid.
Where do the lymph vessels drain into from the larynx?
Above the vocal cord it goes into the upper deep cervical lymph nodes
Below the vocal cord it goes into the lower cervical lymph nodes.
Describe the layout of the larynx superiorly to inferiorly.
- Epiglottis
- Hyoid bone
- Thyrohyoid membrane
- Thyroid notch
- Laminae of thyroid
- Thyroid cartiage
- Cricothyroid ligament
- cricoid cartilage
- Cricotracheal membrane
then trachea.
Where does the larynx extend to?
Extends from the larynx to its bifurcation at the carina.
What rib level is the carina
Rib 2
What is the trachea primarily supported by?
C-shaped rings of the hyaline cartilage
What surrounds the trachea?
- Thyroid glands
- Common carotid arteries
- oesophagus
What is found in the intercostal spaces between the ribs?
- external intercostal muscles
- Internal intercostal muscles
- innermost intercostal muscles ( deep to the internal layer)- furthest inwardsfp
What does the mediastinum contain?
- Heart and great vessels
- Trachea oesophagus
- Phrenic and vagus nerves
- lymph nodes
What does the pleurae consists of?
Continuous serous membrane.
What pleura covers the outer layer of the thoracic chamber?
parietal
What pleura covers the inner layer of the thoracic chamber?
Visceral.
What is the root of the lung called?
The hilum
What is the pleurae double layer at the hilum called?
The pulmonary ligament
What artery supplies the pareital pleura?
Internal thoracic artery.
Same route for veins and lymph
What nerve supplies the parietal pleurae?
The intercostal nerves and phrenic nerve.
This may cause ipsilateral shoulder tip pain if inflammed.
What arteries supply the visceral pleura?
Bronchial artery
What vein drains the visceral pleura?
Bronchial veins to the azygous vein
What lymph vessel drains the visceral pleura?
Superficial plexus to the bronchial pulmonary nodes at the hilum.
Visceral pleura has a autonomic nerve supply true or false?
true.
What does the hilum of the lung consist of ?
- Bronchi
- vessels: 2 pulmonary veins one pulmonary artery
- nerves
- Lymph nodes and vessels
- pulmonary ligament
What are the types of bronchi?
- Primary bronchi
- Lobar bronchi - supplies air to the lobes of each lung
- Segemental bronchi - which supplies air to the bronchopulmonary segment.
How many lobes has the right lung got?
3
How many lobes has the left lung got?
2
What fissures are present on the surface anatomy of the right lung?
oblique and horizontal
What is present on the surface anatomy of the left lung?
oblique fissure and cardiac notch.
Why are foreign bodies more likely to pass through the right main bronchus than its left counter part?
As it is shorter and more vertical
What do airways distal to the bronchi that do not contain any cartilage use for support?
Rely on Lung parenchymal tissue and are kept open by subatmospheric intrapleural pressure.
What is the conducting zone?
Involved in air movement by bulk flow to the end respiratory units
What is the respiratory zone?
Involved in gaseous exchange.
What does the Acinus consist of?
- Respiratory bronchioles
2. Alveolar ducts- these open into alveolar sacs which in turn open into alveoli
What is the blood-air interface?
Term that describes the site which gaseous
What is the upper 1/3 of the nasal cavity called?
ii what is it covered in?
Olfactory area (roof of nasal cavity)
ii. Olfactory epithelium
What is the lower 2/3 of the the nasal cavity lining made out of?
Pseudostratified ciliated columnar epithelium
What is the lining of the respiratory tract to the terminal bronchioles lined with?
Pseudostratified ciliated columnar epithelium
What is the nasopharyngeal tonsil also known as?
Adenoids
What are adenoids a collection of?
Mucosa associated lympoid tissue (MALT)
What is the oropharynx and laryngopharynx lined with?
Non keratinised stratified squamous epithelium
What is the larynx of the epithelium made of?
NKSS and respiratory epithelium.
What is the roles of type I pneumocytes?
They are very thin which allows for short diffusion distance.
What is the role of type II pneumocytes?
Produce surfactant.
What are the physical defences of the lower respiratory tract?
- Filtering at the nasopharynx- hairs withing the nose and sticky mucous
- Swallowing - epiglottis folds back, the laryngeal muscles which constrict the opening to the larynx.
- Irritant C-fibre nerve endings- causes vagal reflex contraction of bronchial smooth muscle. Bronchoconstriction.
How does the cough reflex start?
Via reflex deep inspiration
What is the mucus film divided into?
Perciliary fluid
Superficial gel
What 5 examples inhibit mucociliary clearance?
- Tobacco smoke
- Cold air
- Drugs
- Sulphur oxides
- nitrogen oxides
What is the role of surfactant?
Reduces surface tension and prevents the lungs from collapsing.
What do B lymphocytes produce?
Immunoglobulins
What is the most predominant immunoglobulin produced?
IgA
What is the role of complement proteins?
Chemo-attraction for the migration of cells
What produces complement proteins?
Alveolar macrophages.
Where is alpha 1 antitryspin produced?
Liver
What is the role of alpha 1 anti trypsin?
Oppose neutrophil elastase which breaks down alveolar wall connective tissue in the lungs.
What do alveolar macrophages secrete?
Complement proteins
cytokines
chemokines
Growth factors
Where do alveolar macrophages reside?
Lining of the alveoli.
What is the main role of alveolar macrophages?
Ingest bacteria and debris.
How are alveolar macrophages removed?
Mucociliary clearance
What is the thoracic inlet?
Top of the thoracic cavity
What is the thoracic outlet?
Bottom of the thoracic cavity
What does the upper respiratory tract consist of?
Nasal cavity
oral cavity
Pharynx
larynx
What does the lower respiratory tract/respiratory tree consist of?
Trachea
main Bronchi
Lobar bronchi,
segmental bronchi,
bronchioles
alveoli
What parts of the lower Respiratory tract are located within the lungs?
Lobar bronchi
segmental bronchi
bronchioles
alveoli
What occurs at C6 vertebral level?
- Larynx becomes the trachea
2. Pharynx becomes the oesophagus
How many lobar bronchi are there?
5- one each for each lobe of the lung (3 on the right 2 on the left)
How many segmental bronchi are there?
10- one for each of the 10 bronchopulmonary segments
Each lung lobe and each bronchopulmonary have their own air supply, blood supply, lymphatic drainage and nerve supply true or false?
true
what does the lining of the inside of the bronchial tree consist of ?
(excluding distal bronchioles and alveoli)
Respiratory epithelium:
- Goblet cells- secrete mucous onto epithelial surface
- Cilia- beat to sweep the mucous plus any foreign bodies superiorly to pharynx
Where can hyaline cartilage be found in the respiratory system?
Trachea
all bronchi- decreases distally in the respiratory tree.
Not present at all in bronchioles and alveoli
What is the role of hyaline cartilage?
Holds open the airways ( assists with maintaining the patency of the airways)
What gradually increases in prominence in the distal respiratory tree?
smooth muscle- most prominent feature of bronchioles
How many nasal cavities are in the skull?
2
What does the nasal septum consist of?
Bony(posterior) part of the nasal septum consists of ethmoid bone (superior part) and vomer bone ( inferior part)
The anterior part of the nasal septum is cartilaginous