Respiratory System Chapter 13. Upper Respiratory Tract Lower Respiratory Tract.
Respiratory System_ANATOMY Handout
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Transcript of Respiratory System_ANATOMY Handout
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RESPIRATORY SYSTEM
Jean Flor C. CasauayUPCP Department of Pharmacy
Ph 112: AY 2014-2015
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Functions
• promotes gas exchange• helps regulate blood pH• contains receptors for the sense of smell• filters inspired air• filters inspired air• produces vocal sounds • excretes small amounts of water & heat
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Structural Classification
Upper Respiratory System• nose, pharynx, & associated structures
Lower Respiratory SystemLower Respiratory System• larynx, trachea, bronchi, lungs
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Functional Classification
Conducting Zone• nose, pharynx, larynx, trachea, bronchi,
bronchioles, terminal bronchioles• Volume: 150mL• Volume: 150mL
Respiratory Zone• respiratory bronchioles, alveolar ducts, alveolar
sacs, & alveoli• Volume: 5-6L
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Terms
Otorhinolaryngology• diagnosis & treatment of diseases of the ears,
nose & throat
Pulmonologist• specialist in the diagnosis & treatment of
diseases of the lungs
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1. NOSE
• External Nose– Bony framework– Cartilaginous framework– External nares or nostrilsExternal nares or nostrils
• Internal Nose– Lateral walls– Nasal cavity– Internal nares– Olfactory epithelium
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Functions of the Interior Structures of the External Nose
• warming, moistening, & filtering incoming air• detecting olfactory stimuli• modifying speech vibrations as they pass through the
large, hollow resonating chambers.large, hollow resonating chambers.
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INTERNAL NOSE
Large cavity in the:• Anterior aspect of the skull• Lies inferior to the nasal bone• Lies superior to the mouth• Lies superior to the mouth
Composed of:• Lateral walls• Nasal cavity• Internal nares• Olfactory epithelium
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Internal Nose
• lateral walls: ethmoid, maxillae, lacrimal, palatine, & inferior nasal conchae bones
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Internal Nose
• nasal cavity: space within vestibule: anterior portion just inside the nostrilslined by skin containing coarse hairs that filter out large
dust particlesdust particles nasal septum: vertical partition that divides it into
right & left sides conchae: subdivide each side of it into a series of
groovelike passageways - the meatuses
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Internal Nose
• internal nares or choanae: two openings posterior to the nasal cavities opening into the nasopharynx
• olfactory epithelium: olfactory receptors
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Air enters the nostrils.
It passes through the vestibule.
It is warmed by blood in the capillaries as inhaled air whirls around the
conchae & meatuses.
Mucus moistens the air & traps dust particles.
The cilia move the mucus & trapped dust particles toward the pharynx.
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2. Pharynx
• throat• funnel-shaped tube• starts at the internal nares & extends to the
level of the cricoid cartilagelevel of the cricoid cartilage• Location:
– Posterior to the nasal and oral cavities– Superior to the larynx– Anterior to the cervical vertebrae
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Pharynx
functions: passageway for air &
food provides a resonating
chamber for speech chamber for speech sounds houses the tonsils
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Nasopharynx
• superior portion• Has 5 openings in its wall:
– 2 internal nares– 2 openings that lead into auditory tubes– 2 openings that lead into auditory tubes– Opening into the oropharynx
• Posterior wall houses the pharyngeal tonsil
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Nasopharynx
• Functions:– Receives air from the nasal cavity and receives
packages of dust-laden mucus– Cilia in the nasopharynx move the mucus down – Cilia in the nasopharynx move the mucus down
towards the most inferior part of the pharynx– Exchanges small amounts of air with the auditory
tubes to equalize air pressure between the pharynx and the middle ea
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Oropharynx
• intermediate portion• Lies posterior to the oral cavity• Has only one opening; fauces (opening from
the mouth)the mouth)• Houses palatine & lingual tonsils• Function: a common passageway for air,food
and drink
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Laryngopharynx
• Inferior portion ; hypopharynx
• Begins at the level of hyoid bone
• It opens into esophagus • It opens into esophagus inferiorly
• It opens into the larynx anteriorly
• functions: respiratory & digestive
functions
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3. Larynx
• voice box• short passageway that connects the laryngopharynx
with the trachea• Lines in the middle • Lines in the middle
of the neck• Anterior to the C4-C6
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3. Larynx
• The wall is composed of 9 cartilages: epiglottis, thyroid & cricoid cartilages arytenoid, cuneiform, & corniculate cartilages (in
pairs)pairs)
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Parts and functionsEpiglottis• Large leaf-shaped piece of elastic cartilage• closes the glottis (vocal folds + rima glottidis)
Thyroid Cartilage (Adam’s apple)• Consists of two-fused hyaline cartilage that form the • Consists of two-fused hyaline cartilage that form the
anterior wall of the larynx• usually larger in males• Thyrohyoid membrane
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Functions
Epiglottis: the leaf is the broad superior portion that is unattached and is free to move up and down like a trap door
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FunctionsCricoid Cartilage• landmark for making an emergency airway
(tracheostomy)
• Cricotracheal ligament – attaches the cricoid cartilage to the first ring cartilage of tracheathe first ring cartilage of trachea
• Cricothyroid ligament- connects the thyroid cartilage to the cricoid cartilage
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FunctionsArytenoid Cartilages• Triangular pieces of hyaline cartilage located at the
posterior, superior border of the cricoid cartilage• influence changes in position & tension of the vocal folds
(true vocal cords for speech)
Corniculate Cartilages• Horn-shaped pieces of elastic cartilge located at the apex
of each arytenoid cartilage• supporting structures for the epiglottis
Cuneiform Cartilages• support the vocal folds & lateral aspects of the epiglottis
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Structures of Voice Production
• ventricular folds (false vocal cords)• vocal folds (true vocal cords) thicker & longer in males (androgens) → slow
vibrationvibration• rima vestibuli or rima glottidis space between the ventricular folds
• laryngeal sinus lateral expansion of the middle portion of the
laryngeal cavity
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Laryngitis
• inflammation of the larynx• common causes: respiratory infectionirritants irritants
• hoarseness or loss of voice interfering with the contraction of the folds causing them to swell to the point where they
cannot vibrate freely
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CA of the Larynx
• found almost exclusively in individuals who smoke
• hoarseness, pain on swallowing, or pain radiating to an earradiating to an ear
• treatment: radiation therapy &/or surgery
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4. Trachea
• windpipe• tubular passageway for air• anterior to the esophagus• extends from the larynx to the superior border • extends from the larynx to the superior border
of T5• Composed of 16-20 incomplete horizontal
rings of hyaline cartilage that resemble the letter C
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Trachea
• C-shaped hyaline cartilage rings slight expansion of the esophagus into the trachea
during swallowing semirigid support so that the tracheal wall does semirigid support so that the tracheal wall does
not collapse inward (inhalation) & obstruct the air passageway
• trachealis muscle & elastic connective tissue stabilize the open ends of the cartilage rings
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TRACHEA
• Layers of the tracheal wall (deep to superficial):
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Causes of Tracheal Obstruction
• rings of cartilage may collapse due to a crushing injury to the chest
• inflammation of the mucous membranemembrane
• vomit or a foreign object may be aspirated into it
• cancerous tumor may protrude into the airway
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Management for tracheal obstructioN
1. tracheostomy• operation to make an opening into the
trachea• A skin incision is followed by a short • A skin incision is followed by a short
longitudinal incision into the trachea inferior to the cricoid cartilage.
• The patient can then breathe through a metal or plastic tracheal tube inserted through the incision.
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Management for tracheal obstructioN
2.Intubation• tube is inserted into the mouth or nose &
passed inferiorly through the larynx & trachea• The firm wall of the tube pushes aside any • The firm wall of the tube pushes aside any
flexible obstruction, & the lumen of the tube provides a passageway for air;
• any mucus clogging the trachea can be suctioned out through the tube.
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5. Bronchi
• The trachea divides into right & left primary bronchi right: more
vertical, shorter, vertical, shorter, & wider
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Bronchi
• carina internal ridge at the
point where the trachea divides into right & left primary bronchiprimary bronchi Widening and distortion
usually indicates carcinoma
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Trachea
Primary Bronchi
Tertiary (Segmental) Bronchi
Secondary (Lobar) Bronchi
pseudostratified ciliated columnar epithelium
pseudostratified ciliated columnar epithelium
Am
ount
of C
artil
age
Am
ount
of S
moo
th M
uscl
e
pseudostratified ciliated columnar epithelium
Tertiary (Segmental) Bronchi
Terminal Bronchioles
Bronchioles
pseudostratified ciliated columnar epithelium
ciliated simple columnar epithelium w/ some goblet cells (larger bronchioles)ciliated simple cuboidal epithelium w/ no goblet cells(smaller bronchioles)
nonciliated simple cuboidal epithelium
Am
ount
of C
artil
age
Am
ount
of S
moo
th M
uscl
e
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BRONCHI
Structural changes in the bronchial tree:1. Type of epithelium in the mucous membrane2. Plates of cartilage gradually replace the
incomplete rings of cartilage in the primary incomplete rings of cartilage in the primary bronchi and finally disappear in the distal bronchioles
3. Amount of cartilage decreases, the amount of smooth muscle increases
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6. Lungs
• paired cone-shaped organs in the thoracic cavity
• separated by the heart & other structures in the mediastinumthe mediastinum
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Lungs
• right lung: thicker & broader shorter than the left lung superior, middle, & inferior lobes superior, middle, & inferior lobes
• left lung: about 10% smaller than the right lung superior & inferior lobes
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Pleural Membrane
• Layers: parietal pleura: superficial; lines the wall of the
thoracic cavity visceral pleura: deep; covers the lungs themselves
• Pleural cavity– small space between the pleurae– contains a small amount of lubricating fluid
secreted by the membranes
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terms
• pleurisy or pleuritis: inflammation of the pleural membrane
• pleural effusion: excess fluid accumulates in the pleural spacepleural space
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Pneumothorax & Hemothorax
Pneumothorax (air)• causes: surgical opening of the chest, stab or gunshot
wound• may cause the lungs to collapse (atelectasis)
Hemothorax (blood)
Treatment: evacuation of air or blood from the pleural space
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Thoracentesis
• removal of excessive fluid in the pleural cavity• inserting a needle anteriorly through the 7th
intercostal space
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Surface Anatomy of the Lungs
• base broad inferior portion concave & fits over the convex area of the diaphragm
• apex• apex narrow superior portion
• cardiac notch concavity in the left lung in which the heart lies
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Surface Anatomy of the Lungs
• costal surface surface of the lung lying
against the ribs matches the rounded
curvature of the ribs
• mediastinal (medial) surface contains the hilum: through
which bronchi, pulmonary blood vessels, lymphatic vessels, & nerves enter & exit
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Surface Anatomy of the Lungs
Fissures – divide each lung into lobes:• oblique fissure both lungs
• horizontal fissure• horizontal fissure right lung subdivides the superior lobe forming the middle
lobe
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Lobe of the lungs
• Each lobe receives its own secondary bronchus.– Right primary bronchus give rise to superior, middle
and inferior secondary bronchi– Left primary bronchus give rise to superior and – Left primary bronchus give rise to superior and
inferior secondary bronchi
• Secondary bronchi give rise to tertiary bronchi. There are ten tertiary bronchi in each lung.
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Bronchopulmonary Segment
• segment of lung tissue that each tertiary bronchus supplies
• Bronchial & pulmonary disorders (such as tumors or abscesses) that are localized in a bronchopulmonaryabscesses) that are localized in a bronchopulmonarysegment may be surgically removed w/o seriously disrupting the surrounding lung tissue.
• has many small compartments called lobules
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lobule
• wrapped in elastic connective tissue• contains a lymphatic vessel, an arteriole, a venule, &
a branch from a terminal bronchioles• Terminal bronchioles subdivide into microcopic• Terminal bronchioles subdivide into microcopic
branches called respiratory bronchioles• Respiratory bronchioles subdivide into several
alveolar ducts
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Alveoli & Alveolar Sac
• alveoli cup-shaped outpouching 300M, provides an immense surface area of 70m2
• alveolar sac 2 or more alveoli that share a common opening
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Alveolar Wall
-consist of two types of alveolar epithelial cells: type I alveolar cells The predominant cells Main sites of gas exchange Main sites of gas exchange
type II alveolar cells Septal cells Found between type I alveolar cells Secretes alveolar fluid
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Alveolar fluid
keeps the surface between the cells & the air moist contains, surfactant a complex mixture of phospholipids & lipoproteins a complex mixture of phospholipids & lipoproteins Lowers the surface tension of alveolar fluid which
reduces the tendency of alveoli to collapse
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Alveolar Wall
• alveolar macrophages (dust cells)– Wandering phagocytes that remove fine dust
particles & other debris from the alveolar spaces
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Respiratory Membrane
• Allows rapid diffusion of gases between the lungs and the blood
• Consists of 4 layers:– Alveolar wall – consists of type I and II alveolar – Alveolar wall – consists of type I and II alveolar
cells and alveolar macrophages– Epithelial basement membrane– Capillary basement membrane– Endothelial cells of the capillary