Transcript Respiratory anatomy - PCC

Lab Exercise 24
Anatomy of the Respiratory System
Portland Community College
BI 233
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Introduction
• Provides oxygen to the cells of the body and
removes carbon dioxide
Upper & Lower Respiratory
System
 Upper Respiratory
System
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
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
Nose
Nasal cavity
Paranasal sinuses
Pharynx
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Respiratory system
 Lower Respiratory
System
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


Larynx
Trachea
Bronchi
Lungs
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Nasal bones
• Frontal and nasal bones
form the nasal bridge and
processes of the maxillae
make up the lateral walls.
• Nasal septum divides the
nasal cavity into right and
left halves formed by
vomer and perpendicular
plate of the ethmoid
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Uvula
• During swallowing,
the soft palate elevates
and the uvula closes
off the internal nares,
preventing food or
fluids from entering
the nasal cavity.
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Nasal Cavity
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Nasal Cavity
Opening of
Auditory
Tube
Superior
Middle &
Inferior
Turbinates
or
Chonchae
External
Nares
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Nasal Cavity
 The nasal epithelium covering the conchae
serves to cleanse, warm and humidify the air
• Nasal conchae increase the surface areas
for the mucus epithelium
 The olfactory epithelium in the upper medial part
of the nasal cavity is involved in the sense of
smell.
 The nasal cavity serves as a resonating chamber
as well as an avenue for escaping air.
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Nasal Turbinates or Conchae
• Ciliated pseudostratified
columnar epithelium with
.
goblet cells pushes trapped
dust toward the back of the
throat to be swallowed.
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Sinuses
All the sinuses are
continuous with the nasal
cavity are lined by mucous
membrane.
Mucous secretions drain
into the nasal cavities.
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Pharynx
• Connects the nasal and oral cavities to the
larynx and esophagus
• Anatomically divided into 3 sections:
• Nasopharynx
• Oropharynx
• Laryngopharynx
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Pharynx
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Tonsils
Pharyngeal
Tonsils
(Adenoids)
Palatine
Tonsils
Lingual
Tonsils
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Tonsils
Pharyngeal
tonsils
• Tonsils: lymphoid tissue.
Palatine
tonsils
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Larynx: aka Voice Box
• Made of 9 pieces of cartilage, the most important
are:
• Thyroid cartilage (Adam’s Apple)
• Thyrohyoid membrane
• Cricoid Cartilage
• Cricothyroid ligament
• Epiglottis
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Hyoid Bone
Larynx
Epiglottis
Thyroid Cartilage
Cricoid Cartilage
Thyrohyoid
Membrane
Thyrohyoid
ligament
Cricothyroid
Ligament
Tracheal Cartilage
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Inside the Larynx
• Vestibular Folds:
• Also called false vocal cords, ventricular band of
larynx, ventricular folds, and upper folds
• Vocal Cords, or vocal folds
• Lower, “true” vocal cords
• Attach to the arytenoid cartilages by the vocal
ligaments (internal)
• Glottis: The vocal cords and the space (rima
glottidis) between them.
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Inside the Larynx
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Inside the Larynx
Rima Glottis
True Vocal
Cords
Corniculate
cartilage
Cuneiform
cartilage
Glottis
Epiglottis
Tongue
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Glottis: True cords plus opening
Rima Glottis: The opening
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Larynx
Airways
Trachea
The carina is the last
cartilage which
separates the
entrances to the left
and right primary
bronchi
Right Mainstem
Bronchi
Left Mainstem
Bronchi
Secondary
Bronchi
Carina
Secondary
Bronchi
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Bronchi
• The carina of the last tracheal cartilage marks
the end of the trachea and the beginning of the
right and left bronchi
• Left main stem bronchus
• Right main stem bronchus
• Bronchi subdivide into secondary bronchi, each
supplying a lobe of the lungs
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Respiratory Tree
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Branching of Bronchial Tree
Trachea
Primary Bronchi
Secondary Bronchi
Tertiary Bronchi
Bronchioles
Terminal/Respiratory Bronchioles
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Lungs
•
•
•
•
Apex: the part under the clavicle
Base: the part touching the diaphragm
Costal Surface: the part touching the ribs
Hilus: indentation containing pulmonary and systemic
blood vessels
• Left Lung has 2 lobes and a cardiac notch
• Left upper lobe
• Left lower lobe
• Right Lung has 3 lobes
• Right upper lobe, middle lobe, lower lobe
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Apex
Lungs
LUL
RUL
Hilus
RML
LLL
RLL
Base
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Lungs: Medial View
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Lung Lobes
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Pleura
• Pleura is the double-layered sac of serous membrane
• Parietal Pleura is the outer layer and is attached to the
thoracic walls
• Visceral Pleura is the inner layer covering the lung tissue
• The layers are only touching, they are not fused
together
• The potential space is called the pleural cavity
• There is serous fluid between the layers which allows them to
slide against each other during breathing
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Pleural cavity is in
between the two
layers
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Mediastinum
• The area between the
lungs.
• Posterior to the
sternum
• Anterior to the
vertebrae
• Contains the heart,
great vessels,
esophagus and thymus
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Trachea Histology
• Composed of three layers
• Mucosa: made up of goblet cells and ciliated
pseudostratified columnar epithelium
• Submucosa: connective tissue deep to the mucosa
• Adventitia: outermost layer, has C-shaped rings of
hyaline cartilage
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Trachea
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Trachea Histology
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Trachea Histology
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Seromucous Glands (Trachea)
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Trachea
Pseudostratified
Columnar
Epithelium
Submucosa with
seromucous
glands
Hyaline Cartilage
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Bronchi
Bronchioles
• Tissue walls of bronchi mimic that of the
trachea
• As conducting tubes become smaller,
structural changes occur and eventually they
become bronchioles
• Cartilage support structures change
• Bronchioles differ from bronchi in that they lack
cartilage
• Epithelium types change
• Amount of smooth muscle increases
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Bronchi Histology
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Bronchiole Histology
Notice the lack of cartilage
Simple columnar
epithelium
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Bronchioles
Respiratory Bronchioles
• Respiratory Bronchioles : Continued
branching leads to the area where gas
exchange occurs by simple diffusion
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Respiratory Bronchioles
Alveolar Ducts
Alveolar sacs
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Alveolar sacs
Alveoli
• Alveolar sacs look like clusters of grapes
• The “individual grapes” are Alveoli
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Alveoli Histology
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Type II Pneumocytes
are cuboidal and
produce surfactant
Type 1 Pneumocytes are
flattened for gas exchange
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Respiratory Membrane
•
The area where gas exchange between air and
blood occurs
• It is the fused alveolar and capillary walls (3
layers)
1. Squamous type 1 alveolar epithelium
2. Fused basal laminae
3. Squamous endothelial cells in pulmonary
capillaries
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Respiratory Membrane
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The End
• Make sure that you
can identify structures
on the models
• Identify the structures
on microscopes
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