Histology of respiratory system larynx trache and lung

The respiratory systemSections of the larynx, trachea and

lung

Mediansaggital section of the larynx

1.

2.

3.

5.

4.

6.

7.

vestibule

ventricule

subepiglotticcavity

4.

1. epiglottic cartilage2. thyroid cartilage3. arch of cricoid cartilage4. cartilages of trachea5. lamina of cricoid cartilage6. vestibular fold7. vocal fold

Hyaline cartilage:Thyroid cartilageCricoid cartilageArytenoid cartilage except the vocal process

Elastic cartilage:Vocal process of arytenoid cartilageCorniculate cartilageCuneiform cartilageEpiglottic cartilage

Epiglottisstratified squamous nonkeratinized epithelium

with high papillae on the pharyngeal surfacestratified nonkeratinized squamous epithelium

without papillae on the laryngeal surfaceLarynx

ciliated pseudostratified columnar epitheliumVocal fold

stratified squamous nonkeratinized epithelium

51. larynx-epiglottis (HE), 4X

laryngeal surface

pharyngeal surface

elastic cartilage

salivaryglands

Vestibular foldVocal fold

Ventricule

51. larynx (HE), 4X

Identification of the surfaces of epiglottisDetermination of vestibular and vocal foldsRecognition of covering epithelia

1.Tunica mucosa:a, epithelium mucosae: ciliated pseudostratified columnar

epithelium, goblet cells, endocrine cellsb, lamina propria: loose connective tissue,

lymphocytes, plasma cells

2. Tunica submucosa: loose connective tissuetracheal glands sero-mucous glands

3. Tunica fibro-musculo-cartilaginea: hyaline cartilage ringsannular ligg.paries membranaceus(trachealis muscle, connective tisue)

4. T. adventitia: connective fibers, blood vessels, nerves

52. trachea (HE), 4X

ciliated pseudostratifiedcolumnar epithelium

trachealglands

hyalinecartilage

pariesmembranaceus

52. trachea (HE), 40X

basal lamina

ciliated pseudostratifiedcolumnar epithelium

capillarylamina propria

Find the characteristic items of thetracheal wall.

1. T. mucosa: - ciliated pseudostratified columnar epithelium- epithelium gradually decreases in its height,lamina propria becomes thinner towards theterminal bronchioli

2. T. muscularis: smooth muscle layer in the larger bronchiis replaced by spirally arrenged smoothmuscle cells in the smaller bronchi

3. Cartilage plates: decrease gradually in number and size

4. Adventitia: collagen fibers.

In the wall of the bronchi small salivary glands can be found.

53. lung- bronchus (HE), 10X

hyalinecartilage

smoothmuscle

alveolus

bronchiallumen

epithelium

53. lung- bronchiole(HE), 10X

lumen ofbronchiole

epithelium

alveoli

53. lung (HE), 40X

alveolus

septum

pneumocyte II

pneumocyte I

Differentiate between the walls of bronchi and bronchioli.

The layers of the blood-air barrier

type I cell

surfactant

capillary endothel

fused basal lamina

capillarylumen

54. lung (orcein), 40X

elasticfibers

pneumocyte II

pneumocyte I

Study the thin walls of alveoli.

Try to find pneumocyta II cells.