Summary
Summary chapter 17 respiratory system Junqueira's Basic Histology
chapter 17 Junqueira's Basic Histology summary
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
1 review
By: mananabagatelia • 2 year ago
By: OGN • 2 year ago
Thank you for the review
Content preview
Respiratory System Air is moved through the lungs by a ventilating mechanism, consisting of the thoracic cage, intercostal
muscles, diaphragm, and elastic components of the lung tissue.
Th e system is divided anatomically into structures of the upper and lower respiratory tracts. Functionally, the
system has two components:
A. The conducting portion (nasal cavities, nasopharynx, larynx, trachea, bronchi terminal bronchioles
B. The respiratory portion, where gas exchange occurs, consisting of respiratory bronchioles & alveoli
Nasal Cavity:
o Has external dilated vestibule and internal nasal cavity
o Skin of nose enters the nostrils into the vestibule and has sweat glands, sebaceous glands, and vibrissae
(hairs) that filter out material from air.
o The skin loses its keratinized nature in the vestibule and becomes pseudostratified columnar epithelium
before entering the nasal cavities.
o Nasal cavities are separated by the septum, and extending from each lateral wall are 3 boney
projections called conchae.
o The mucosa covering the nasal cavity has lamina propria that conditions inhaled air.
o IgA secretion from plasma cells in the lamina propria are found in nasal secretions.
o Middle and inferior conchae are covered with respiratory epithelium, while the roof of the nasal cavities
and the superior conchae are covered with olfactory epithelium.
Respiratory epithelium:
Ciliated pseudostratified columnar epithelium
Has 5 major cell types:
1. Ciliated columnar cells: most abundant
2. Goblet cells: granules of mucin glycoproteins
3. Brush cells: columnar cells with microvilli. They are chemosensory receptors resembling gustatory cells.
4. Small granule cells: part of the diffuse neuroendocrine system (DNES)
5. Basal cells: mitotically active stem and progenitor cells.
Olfactory epithelium:
Pseudostratified columnar epithelium
Has 3 major cell types:
, o Olfactory neurons:
Bipolar neurons
They form olfactory nerve when they pass through cribiform plate, Cranial nerve 1.
Synapse with other neurons in olfactory bulb
o Supporting cells:
Columnar
Have microvilli
o Basal cells:
Stem cells for other two types of cells
The lamina propria of olfactory epithelium possesses large serous glands, the olfactory glands (of
Bowman), which produce a constant flow of fluid surrounding the olfactory cilia.
o Paranasal sinuses: found in frontal, maxillary, ethmoid and sphenoid bones of the skull.
They are lined with thinner respiratory epithelium.
Its lamina propria contains few small glands
Nasopharynx: first part of the pharynx. It is lined with respiratory epithelium and its mucosa contains the medial
pharyngeal tonsil and the bilateral openings of the auditory tubes connected to each middle ear cavity.
Larynx:
o Reinforced by hyaline cartilage and elastic cartilage
o Participate in sound production
o The epiglottis (upper rim of larynx) prevents swallowed food or fluid from entering the passage.
o Its upper surface has stratified squamous epithelium
o Mixed mucous and serous glands are found in the lamina propria beneath the epithelium
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller OGN. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.12. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50843 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now