Hyoid Bone. Lower Airway. Aspiration. Larynx. Cartilages of the Larynx. Larynx Tracheobronchial Tree (TB Tree) Trachea Bronchi Bronchioles
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1 Lower Airway Larynx Tracheobronchial Tree (TB Tree) Trachea Bronchi Bronchioles Respiratory Terminal Hyoid Bone Not part of the larynx. The Hyoid bone is an anchor for the anterior muscles of the neck and is highly mobile. It also attaches to the muscles of the tongue to provide a stable or mobile base as the mobility of the tongue requires. Larynx Aspiration Voice Box Function Prevents aspiration Generates sound for speech Conducts air between the pharynx and trachea Creates pressure changes Aspiration is the movement of food, liquid, vomit or a foreign substance into the trachea. Aspiration usually involves coughing or choking until the substance is removed if the patient has intact reflexes If large amounts of material or acidic, caustic materials (vomit) are aspirated, lung damage will result Increased Risk of Aspiration Extremes of Age Recent Meal Delayed gastric emptying Trauma Depressed level of consciousness Poor motor control Cartilages of the Larynx Composed of nine cartilages Three unpaired cartilage Thyroid (Greek for Oblong Shield) Cricoid (Greek for ring) Epiglottitis (Greek for above glottis ) Three paired cartilages (six total) Arytenoids (Greek for ladle) Corniculates (Latin for horns cornucopia) Cuneiforms (Latin for wedge) 1
2 2. Arytenoid cartilage 3. Cervical trachea 6. Epiglottic larynx 7. Epiglottis 8. False Vocal Cords 9. Hyoid Bone 12. Subglottic larynx Paired Cartilages The Arytenoids, Cuneiforms, and Corniculates are all associated with movement of the vocal cords and are used in phonation. 15. True Vocal Cords Thyroid Cartilage The largest laryngeal cartilage is the thyroid cartilage Adam s Apple Superior border has a V- shaped notch. Suspended from hyoid bone. Posterior wall is open. The true and false vocal cords are found on the interior of the larynx. Vocal Cords Two pairs of folds that protrude inward: Upper pair False cords Lower pair True cords The space between the vocal cords is called the rima glottidis or glottis Narrowest portion of the adult airway 2
3 Vocal Cords Vocal Cords Vocal Cord Abduction Cords are opening or moving away from the midline This occurs during inspiration Vocal Cord Adduction Cords are moving toward the midline or coming together This occurs during expiration Epiglottis Spoon-shaped cartilage which prevents aspiration by covering the opening of the larynx during swallowing. The tongue and the epiglottis are connected by folds of mucous membranes which form a small space called the vallecula. Intubation A device called a laryngoscope is used to visualize the laryngeal structures. It is composed of a handle and one of two types of blades: A curved blade (McIntosh) A straight blade (Miller or Wisconsin) A curved laryngoscope blade is inserted into the vallecula during intubation to lift the epiglottis indirectly. A straight laryngoscope blade is used to directly lift the epiglottis during intubation 3
4 Cricoid Cartilage Resembles signet (class) ring. Inferior to Thyroid. Only complete ring of laryngeal structures. Inferior border is attached to the first C-shaped tracheal ring. The narrowest portion of the airway in an infant. We use this fact when ventilating infants as infant ET tubes do not have cuffs to seal the trachea. Cricothyroid membrane Connects the cricoid and thyroid cartilages Is the site for an emergency airway Cricothyrotomy Laryngeal Swelling Swelling (edema) at the glottis, subglottic or supraglottic region can cause stridor Stridor is a high pitched crowing sound usually heard on inspiration from air traveling through a narrowed opening Croup, Epiglottis, Foreign Body Laryngospasm A laryngeal reflex which will close the vocal cords inside the larynx Laryngospasm results from Extubations Near drowning Inhalation of noxious substances Smoke inhalation 4
5 Valsalva Maneuver Forced expiratory effort against a closed glottis to increase intrathoracic pressure (defecation) or to inflate the eustachian tubes and middle ears ( clearing of the ears on airplanes). The larynx will tightly seal preventing air from escaping during physical work Lifting, pushing, throat-clearing, vomiting, urination, defecation and parturition. Head Position Flexed Extended Histology of the Larynx Above the vocal cords stratified squamous epithelium Below the vocal cords pseudostratified columnar epithelium Trachea to respiratory bronchioles Tracheobronchial Tree Two Divisions Cartilaginous Airways Primarily conducting airways; no gas exchange. Noncartilaginous Airways Both conducting airways and sites of gas exchange. Dichotomous Branching Each airway divides into two daughter branches Each division (bifurcation) gives rise to a new generation of airways As airways divide, they become Shorter Narrower More numerous 5
6 Cartilaginous Airways Trachea Main Stem Bronchi Lobar Bronchi Segmental Bronchi Subsegmental Bronchi Lobar Bronchi Generation 0 Trachea cm long and cm wide. Extends from Cricoid cartilage (6 th cervical vertebrae) to the 2 nd costal cartilage or 5 th thoracic vertebrae. C6 T C-shaped cartilages supports the trachea. Posterior wall is contiguous with esophagus. Trachea The end of the trachea is called the carina. This is the division of the trachea into the right and left mainstem bronchi. Air is 100% saturated with water vapor and is warmed to 37 C (body temperature). The carina is located at approximately T5 or the Angle of Louis. The surgical opening into the trachea is called a tracheostomy. 2 nd or 3 rd tracheal ring. 6
7 Main Stem Bronchi Generation 1 Trachea divides into the right and left mainstem bronchi one for each lung Right Mainstem is wider, shorter and more vertical Branches at a 25 degree angle Left Mainstem Branches at a angle Infants Both mainstem bronchi form a 55 angle with the trachea Complications of Intubation Newborn During intubations, if the tube is advanced to far, the tube will usually go into the right mainstem bronchi. Lung inflation will be absent on the left but present on the right. Withdraw tube until bilateral sounds are heard. Failure to hear lung sounds or visualize chest inflation on either side means the tube is probably in the stomach. Extubate the patient and re-attempt the intubation. Aspiration Children who aspirate objects Foreign body usually lodged in right main stem bronchi secondary to the angle being less acute. Wheezing on right or absent lung sounds (breath sounds). Lobar Bronchi Generation 2 Lobar Bronchi correlate to the number of lobes of the lung. The right mainstem bronchi will divide into the right upper, right middle and right lower lobe bronchi. The left mainstem bronchi will divide into the left upper and left lower lobe bronchi. 7
8 Segmental Bronchi Subsegmental Bronchi Generation 3 Correlate with the segments of the lung. There are 10 segmental bronchi on the right. There are 8 segmental bronchi on the left. 4 th to 9 th Generations 1 to 4 mm in diameter Connective tissue containing: Nerves Lymphatics Bronchial Arteries Non-Cartilaginous Airways Bronchioles 10 th to 15 th Generation. 1 mm in diameter. Simple cuboidal epithelium. No cartilage. Terminal Bronchioles Less than 0.5 mm in diameter. No cartilage (lack of support). Cilia and mucous glands disappear. Clara Cells appear Inter-bronchiole connections called Canals of Lambert begin to appear. Blood Supply to the Tracheobronchial Tree Bronchial Blood Supply Bronchial arteries nourish the tracheobronchial tree The arteries arise from the aorta and follow the tracheobronchial tree as far as the terminal bronchioles. Beyond the terminal bronchioles pulmonary arteries & capillaries feed the airways & alveoli. Normal bronchial blood flow is approximately 1% of the cardiac output. Also feed the mediastinal lymph nodes, pulmonary nerves, part of the esophagus and the visceral pleura. 8
9 Review of TB Tree Trachea Mainstm Bronchi Lobar Bronchi Segmental Bronchi Subsegmental Bronchi Bronchioles cartilage disappears Terminal Bronchioles Site of Gas Exchange The Respiratory Zone Consists of the respiratory bronchioles, alveolar ducts, and alveolar sacs, and alveoli. Parenchyma, Acinus or Primary Lobule. Creative Commons Attribution Alveolar Epithelium Two principal cell types: Alveolar Type I Cells Squamous pneumocyte Broad thin cells. 95% of alveolar surface 0.1 to 0.5 thick Alveolar Type II Cells 5% of alveolar surface Cuboidal in shape Responsible for secretion of pulmonary surfactant that reduce surface tension and keep the alveoli stable. Facts about the Lungs There are 300 million alveoli in the lungs. The surface area of the lungs is square meters (Tennis Court). The lung has 35 times more surface area then the skin. 9
10 Additional Components of Alveolar Epithelium Pores of Kohn Small holes in the walls of interalveolar septa. 3 to 13 in diameter Alveolar Macrophages or Type III alveolar cells. Major role in removing bacteria and other foreign particles. Interstitium Gel-like substance between alveoli-capillary clusters that add support Lung Extends from the diaphragm to 1-2 cm above the clavicles (about the 1 st rib). The lung apex is at the top of the lung and is somewhat pointed. The base is broad and concave and lies at about the 6 th rib or xiphoid process anteriorly, the 8 th rib laterally, and the 11 th rib posteriorly. The right lung is larger and heavier than the left. 10
11 Lung Lobes and Segments Right lung Three Lobes Upper, Middle, Lower Divided by the Horizontal and Oblique fissures. 10 Segments Left lung Two Lobes Upper and Lower Divided by the Oblique fissures. 8 Segments LOBES AND SEGMENTS OF THE LUNGS LATERAL MEDIAL RIGHT LUNG UPPER LOBE APICAL SEGMENT ANTERIOR SEGMENT POSTERIOR SEGMENT MIDDLE LOBE LOWER LOBE SUPERIOR ANTERIOR BASAL MEDIAL BASAL LATERAL BASAL POSTERIOR BASAL UPPER LOBE (UPPER DIVISION) APICAL/POSTERIOR ANTERIOR UPPER LOBE (LINGULA) SUPERIOR INFERIOR LEFT LUNG LOWER LOBE SUPERIOR ANTERIOR/MEDIAL BASAL LATERAL BASAL POSTERIOR BASAL Lung Fissures Oblique Fissure Found in the left and right lung Separates the upper and lower lobes of both lungs Horizontal or minor Fissure Found only in the right lung Separates the upper and middle lobes Horizontal fissure Oblique fissure 11
12 Hilum The hilum is where arteries, veins, bronchi, nerves and lymph vessels enter and leave the lung. It is located on the medial border of the lung. 12
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