histology of skeletal muscle and cartilage

1. Histology practical 1
(Histology of skeletal muscle & Cartilage)
By : Osama Al-Zahrani
@OSAMA_Z96

2. Skeletal muscle
(Striated)
* Component & Characteristics :
1- Striated muscle fibers (skeletal).
2- Transverse striation :
A - Band > Dark.
I - Band > Light.
3- Cylindrical fibers.
4- Peripheral nuclei.
5- Connective tissue fibroblasts.
Peripheral nuclei
Striated muscle
fibers (skeletal)Connective tissue fibroblasts
Transverse striation
A - band
( dark = Myosin + Actin)
I - band
( Light = Actin only)

4. Skeletal muscle
* Component & Characteristics :
1- L.S. Skeletal muscle fibers.
2- T.S. Skeletal muscle fibers.
3- Striated.
4- Peripheral nuclei.
5- Fused myoblasts (syncytium).
6- Multinuclei.
* Function :
- Strong and sustained contraction.
- Red fibers : Small diameter, not easily fatigued, slow.
- White fibers : Big diameter, easily fatigued, fast
T.S. Skeletal muscle fibers
L.S. Skeletal muscle fibers

6. Hyaline Cartilage in Trachea (Windpipe)
(Elective single)
* Component & Characteristics :
1- Hyaline cartilage.
2- Cell nest (isogenous).
3- Hyaline matrix.
4- Fibrocartilaginous layer.
5- Tracheal muscle : (Posterior to give space for the esophagus).
6- Perichondrium : (Collagen fibers, Fibroblasts, Chondrogenic cells).
7- Tracheal gland (Mocu-serous).
8- Mucosa.
9- Submucosa.
10- Fibrosa.
11- Respiratory epithelium :
(Pseudostratified columnar ciliated + Goblet calls.)
* Function :
Hyaline cartilage :
- Keep the airway patent.
- Protect the vital organ and allow movement.
Trachea :
- Air conditioning, conduction, and cleaning (filtration).
Respiratory epithelium
Mucosa
Submucosa
Goblet cells
Hyaline cartilage
Hyaline matrix
Perichondrium

8. Elastic Cartilage
( Ear Pinna)
Silver stain (Dark brown - Black)
* Component & Characteristics :
1- Perichondrium
(Collagen fibers + Fibroblast + chondrogenic cells).
2- Chondroblast (Spindle shape).
3- Chondrocyte (Rounded or hemispherical).
4- Elastic fibers.
5- Cell nest (Isogenous).
* Function :
Firm bendable elastic tissue.
Chondrocyte
Cell nest (Isogenous)
Chondroblast
Elastic fibers
Perichondrium
Perichondrium