Lecture 1 Flashcards
Heart Layer
(outer to inner)?
-Epicardium
-Myocardium
-Endocardium
(Heart Layers)
Epicardium?
Fat cells, b.v., nerves
(Heart Layers)
Myocardium?
Cardiac muscle (ex. myocytes)
(Heart Layers)
Endocardium?
Purkenjie cells, fibers, smooth muscle
(subendocardium –> sub endothelium –> endothelium)
(Heart Layers)
Inside of the Heart is lined with?
Endothelium
(simple squamous epithelium)
(Heart Layers)
Outside of Heart is lined with?
Mesothelium
(simple squamous epithelium)
(Heart Layers)
Purkenjie cells?
Conducting cells (modifying myocytes)
Blood Vessels are?
Arteries, Arterioles, Capillaries, Veins, etc.
(Blood Vessels)
Portal systems occur between 2 capillary beds?
-Arterial system (in kidneys) has an arteriole between 2 beds
-Venous system (in liver) has a vein between 2 beds
Blood Vessel Layers
(outer to inner)?
-Tunica Adventitia
-Tunica Media
-Tunica Intima
(Blood Vessel Layer)
Tunica Adventitia?
(outer)
Elastic Fibers
(External Elastic Lamina = elastic fibers)
(Blood Vessel Layers)
Tunica Media?
(middle)
Elastic Fibers + Smooth Muscle Cells
(Internal Elastic Lamina = elastic fibers)
(Blood Vessel Layers)
Tunica Intima?
(inner)
Smooth Muscle Cells
(Blood Vessels)
Inside of the blood vessels is lined with?
Endothelium
(cells secrete VWF, endothelia, collagen (2/4/5), glycoprotein
Elastic Arteries?
-Thick tunica media
-Lots of elastic media –> stains dark purple (more fibers than cells)
-Examples = aorta + pulmonary trunk
Medium Veins?
-Thin tunica media = elastic + reticular (type 3 collagen) fibers, SMCs
-Adventitia blends in with surrounding CT
-Irregular shaped
Large Veins - Vena Cava?
-Thin tunica media = elastic + reticular (type 3 collagen) fibers, SMCs (reticular fibers only visible with silver stain)
-May contain valves (unliked arteries)
Arterioles?
-Characterized by 1-2 layers of SMCs
-Metarterioles control flow article into capillary
(arterioles look bigger than capillaries)
Capillaries?
-Characterized by 1 layer of endothelium
-Continuous capillaries
-Fenestrated capillaries
-Sinusoidal (discontinuous) capillaries
(Capillaries)
Continuous Capillaries?
In muscle + nerve tissue
(contain a fully intact membrane (ex. it has NO holes in it) –> thus, NO diffusion)
(Capillaries)
Fenestrated Capillaries?
In digestive organs + pancreas
(contain a perforated membrane (ex. it has some holes in it) –> thus, some diffusion)
(Capillaries)
Sinusoidal (discontinuous) Capillaries?
In liver + spleen + bone marrow
(contain an incomplete membrane (ex. it has large gaps in it) –> thus, diffusion of large products like RBCs)
Neurovascular Bundle?
Contains nerve, artery, vein and lymph surrounded by a fascial sheath (CT)
(Neurovascular Bundle)
Identify Nerve?
No lumen, but several nerve fascicles (bundle of fibers)
