Histology Flashcards
What are the names of the 3 layers of the blood vessels?
- tunica intima
- tunica media
- tunica adventitia
What is the tunica media composed of?
- smooth muscle
What is the tunica intima composed of?
- squamous epithelial cells
What is the tunica adventita composed of?
- supportive connective tissue
What seperates the tunica intima and the tunica media?
- internal elastic membrane
What sperates the tunica media and the tunica adventita?
- external elastic membrane
What does the term elastic arteries describe?
- large arteries eg. aorta
- contain sheets of elastic fibres in their tunica media
- provides elastic recoil
The arterioles have almost no tunica adventitia?
True or false?
- True
What are capiliaries composed of?
- endothelial cells and basal lamina
What are pericytes?
- connective tissue found in capillaries with contractile properties
What are the 3 types of capiliaries?
- continous
- fenestrated
- discontious
What are the 3 layers of the heart?
- epicardium
- myocardium
- endocardium
What lies towards the surface of the heart the serous pericardium or fibrous?
- serous is innermost
What is the purpose of intercalated disks in the myocardium?
- to allow the spread of electrical activity
What lies in the pericardial cavity?
- lubricating fluid
What lines the heart valves?
- outer endothelial layer
- basal lamina
- collagen and elastic fibres
Chordae tendineae is present on what valves?
- tricuspid
- mitral
What do the pacemaker cells appear like down the microscope?
- smaller than myocytes
- paler in colour
What do purkinje fibres appear like down the micoscope?
- larger than cardiac musclr cells
- paler
- found in subendocardial layer
What are the 3 different types of cardiac muscle cells?
- contractile
- pacemaker
- conduction
Explain the histology of the lymph vasculature?
- thin walled vessels
drain excess interstitial fluid
