Types of tissues (Basics of Histo) Flashcards
Scope: a) Types of germ layers b) Categories of tissues b.1) Epithelium -Covering epithelia -Glandular epithelia b.2. Connective tissues -General connective tissues -Special connective tissues -Deposits found in connective tissues b.3. Muscle tissues b.4. Nervous tissues
Support
Framework
Cells are widely separated
Connective tissue
Categories of tissues and the germ layer from where they were formed.
- Epithelial = 3 germ layers
- Nervous = endoderm
- Muscular = mesoderm
- Connective = mesoderm
3 germ layers
- Ectoderm
- Mesoderm
- Endoderm
What type of epithelial are Bowman’s, endothelium, alveoli and loop of Henle?
Simple squamous epithelium
What type of epithelium are ducts of glands and walls of thyroid follicles?
Simple cuboidal epithelium
What type of epithelium are gallbladder (nonciliated) and uterine tube (ciliated)?
Simple columnar epithelium
Give body areas where stratified squamous epithelium are found.
skin (keratinized),
vagina,
esophagus, and
cervix (non-keratinized)
Give body areas where stratified squamous epithelium are found.
What type of epithelium is male urethra?
stratified columnar epithelium
The following are what type of epithelium?
•Female reproductive tract (nonciliated)
•Trachea (ciliated)
•Epididymis
Pseudostratified columnar epithelium
Types of covering epithelia
- Simple squamous
- Simple cuboidal
- Simple columnar
- Stratified squamous
- Stratified columnar
- Pseudostratified columnar
with ducts
Tubular = stomach, uterus
Acinar/ alveolar = pancreas, salivary glands
Tubuloacinar = prostate
Exocrine glands
ductless glands
Endocrine glands
Exocrine = enzymes
Endocrine = hormones
Pancreas
No loss of cytoplasm
Goblet cells, sweat glands
Merocrine
with loss of cytoplasm
Distal portion is pinched off
Mammary glands
Apocrine
Disintegrating cell and its constituents released
Complete breakdown of cell
Sebaceous glands
Holocrine
Types of Glandular epithelia
- Endocrine glands
- Exocrine glands
Based on their secretion method, glands are classified as:
- Merocrine
- Apocrine
- Holocrine
Major ingredient of connective tissues
Stains: ACRONYM “VgMMAK”
1. Van Gieson
2. Mallory’s aniline blue
3. Masson’s trichrome
4. Alcian Blue
5. Krajian’s aniline blue
Collagen
Stains used for collagen
“VgMMAK”
- Van Gieson
- Mallory’s aniline blue
- Masson’s trichrome
- Alcian Blue
- Krajian’s aniline blue
Connective tissue can further be broken down into three categories:
- Loose connective tissue
- Dense connective tissue
- Specialized connective tissues
The following are which type of connective tissue?
1) Wharton’s jelly (acid MPS)
2) Bone marrow (reticular)
3) Lymph node (reticular)
4) Embryo (mesenchyme)
5) Hypodermis
Loose connective tissue
The following are which type of connective tissue?
1) Dermis
2) capsule
3) Tendons
4) Stroma of cornea
Dense connective tissue
Examples of special connective tissue
*Cartilage
*Bone
*Blood, lymph, hematopoietic tissues
1) Fixative and
2) Stain for acid mucopolysaccharides
1) Lead fixatives
2) Alcian blue
Brittle bone disease
Defective production of collagen
Osteogenesis Imperfecta (OI)
is a deposit found in connective tissues that appears:
Early: yellow
Old: blue
Fibrin
Stains used for fibrin
1) Mallory’s PTAH (Phosphotungstic Acid-Hematoxylin)
2) Lendrum MSB (Martius yellow, Scarlet, Blue)
Necrotizing vasculitis
Staining reactions identical to fibrin
Mixture of exudates & altered cytoplasmic constituents
Fibrinoid
Degenerated collagen
Refers to deposits found in connective tissues of patients with:
-hypertension
-atheroma
-diabetic kidney
Hyaline
Stain for hyaline
Periodic acid-Schiff (PAS)
Stains for amyloid
“CoMT”
-Congo red
-Metachromatic stain
-Thioflavine
refers to deposits found in connective tissues of patients with TB, leprosy, osteomyelitis
are a group of proteins that share the common characteristic of the ability to form beta-pleated sheets, which are resistant to proteolysis.
Amyloid
Types of muscle tissues
- Smooth
- Cardiac
- Skeletal
ex. Involuntary intestines, blood vessels
Smooth muscle
Striated, voluntary muscles
Skeletal muscle
Striated, involuntary
Cardiac (heart) muscle
CNS includes:
Brain and spinal cord
PNS includes
Peripheral nerves
Special receptors are located in:
Ears, eye, nose