Anatomy Flashcards
How thick is the respiratory membrane?
0.5 - 1 micrometre thick
Basic nasal structural anatomy
- Based on what type fo structure? Supported by? 2
Covered in?
- Basic structural anatomy: Cartilaginous structure, supported by hyaline cartialge and nasal bones. Beyond the vestibule of the nostrils, some anterior skin transitions into a respiratory mucous epithelium at the mucocutaneous junction
3 areas in the nasal cavity? Where are they in relation to each other?
◦ Vestibular area, lined by skin (extends 1cm into the cavity)
◦ Respiratory area, lined by respiratory mucous membrane with pseudostratified ciliated columnar epithelium. Contains the three concha which project into the cavity.
◦ Olfactory area, at the roof of the cavity (lower boundary is the superior conchae)
Relations of the nasal cavity
◦ Floor of the nose is the roof of the mouth
◦ Roof is the narow junction of the lateral walls
◦ Lateral wall superiorly is the medial wall of the orbit
◦ Lateral wall inferiorly is the medial wall of the maxillary sinus
◦ Medial wall is the septum
Blood supply of the nasal cavity?
◦ sphenopalatine artery (terminal branch of the maxillary artery)
◦ septal branch of the superior labial artery
◦ ascending branch of the greater palatine artery
◦ All of these come together into an anastomosis in the lower anterior septum (Little’s area), which is called Kieselbach’s Plexus (where epistaxis commonly occurs)
Lymphatic drainage of the nose?
Submandibular, deep cervical, retropharyngeal nodes
Innervation fo the nasal cvity?
Infraorbital nerve (bestibular, olfactory to olfactory, and multiple nerves to respiratory area
Function of the nasal cavity 4
◦ Humidification and warming of inspired air
◦ Reclamation of expired moisture and heat
◦ Olfaction and sense information about air temperature
◦ Speech (nasalisation)
◦ Sneezing (protective reflex)
How long is the pharynx
12cm
Walls of the pharynx have 4 layers
‣ mucous membrane
‣ submucous layer (or fibrous layer)
‣ muscular layer
‣ buccopharyngeal fascia
What level does the oesophagus start
C6
What si the posterior relation of the pharynx?
◦ Posteriorly: slides freely along the prevertebral fascia (separated by the retropharyngeal potential space)
Surface anatomy of the larynx
Adams apple or larygneal prominence is the thyroid cartilage
Cricothyroid membrane easily palpable
What lines the larynx?
◦ Lined by pseudostratified columnar ciliated epithelium
Relations of the larynx
◦ Superiorly: bounded by the hyoid bone - thyrohyoid membrane and muscle suspend the larynx
◦ Anteriorly, covered by skin and protected by the thyroid cartilage
◦ Inferiorly: becomes continuous with the trachea at the level of C6
◦ Posteriorly: projects into the laryngopharynx
Where vertebrally does the larynx become the trache
C6
Laryngeal inlet faces what direction?
Backwards and upwards
What binds the laryngeal inlet anteriorly
Epiglottis
What binds the laryngeal inlet laterallly and posteriorly
Aryepiglottic folds
◦ Ary-epiglottic fold - lateral epiglottis –> arytenoid cartilages fold of mucosa forms the laryngeal inlet
‣ Round bump on either side is the cuneiform cartilage, with the arytenoids medially to this
‣ The laryngeal inlet is often depicted from an oblique angle
What binds the laryngeal inlet posteriorly
Interarytenoid fissure
What is the vallecula?
◦ Vallecula - 2x reflections of mucosa, with medial and lateral epiglottic folds
What is the vestibular fold
Mucosal fold over the vestibular ligament, false vocal ligament
What divides the infraglottic and supraglottic space? What type of epithelium lines it? Why is this relevant?
‣ The larygneal vestibule is this space - the vestibule is the space between the two folds, the infraglottic space and supraglottic space are either side of the vestibule
* Supraglottic space - respiratory epithelium with mucous
* The laryngeal saccule releases secretions into this space to lubricate the vocal folds
What is the vocal fold
Mucosal fold over the vocal ligament