Thorax 2 Flashcards
What borders the nasal cavity from the nasopharynx
Choanae
Largest paranasal sinus?
Maxillary sinus
What nerve innervates almost every muscle of the layrnx (motor innervation)?
What is the exception? and what is it innervated by?
Recurrent laryngeal nerve (branch of vagus n.)
* Exception - Cricothyroid muscle (external laryngeal nerve)
Larynx nerve supply - Supraglottis, glottis, subglottis
Branches of VAGUS n.
- Superior laryngeal n.
- Recurrent laryngeal n.
Arterial supply to nasal cavity
Both internal and external carotid aa.
Innervation of the nasal cavity
- Olfactory n. - for olfaction
- Maxillary & Opthalmic nn. - general sensation
- Facial n.
At what landmark does the trachea bifurcate into left & right primary bronchi
Sternal angle
How many secondary bronchi do the right and left lungs have?
Right - 3 secondary bronchi (remember 3 lobes)
Left - 2 secondary bronchi (2 lobes)
Where do the lungs receive OXYGENATED blood from?
L. & R. Bronchial aa. (From thoracic aorta)
What differentiates the nasal vestibule from the rest of the nasal cavity
Nasal vestibule is lined with skin
- The rest of the nasal cavity is lined with mucous membrane
What is the choanae?
Opening between the nasal cavity & the nasopharynx
Lymphoid tissue of the pharynx
Tonsils
- Pharyngeal tonsil
- Palatine tonsil
- Lingual tonsil
Sensory nerve supply to pharynx
Nasopharynx - maxillary n.
Oropharynx - glossopharyngeal n.
Laryngopharynx - vagus n.
What are the paired vs unpaired cartilages - Larynx
Unpaired - Thyroid c., epiglottis, cricoid c.
Paired - Arytrenoid, corniculate, cuneiform
Thryoid cartilage function
- Shield larynx from injury
- Provides anterior attachment to vocal cords
