13.1 POJA-L4722 Types of capillaries
13.1 POJA-L4722
Title: Types of capillaries
Description: Text file shows classification of capillaries.
Capillaries in different locations are built differently according to functional requirements in the organs. The endothelium can be continuous or fenestrated. The basal lamina can be single and continuous or be fused from a double layer.
I. Capillaries with continuous endothelium (most common) and a closed basal membrane, i.e. somatic capillaries, non-fenestrated.
1.1. Continuous basal lamina (muscle, dermis)
1.2. Partly common (fused dual) basal lamina (alveolus lung)
1.3. Continuous lamina basalis +perivascular glial end-feet (blood-brain-barrier)
II. Capillaries with fenestrated endothelium pierced by pores, most frequent in gastrointestinal mucosa, endocrine tissue and renal glomeruli. The fenestrations can be provided with a thin diaphragm. The pores are about 20-100 nm wide.
II.1. Continuous basal lamina and fenestrae in endothelium (pancreas, intestinal villi)
II.2. Continuous fused dual basal lamina and fenestrae in endothelium (GBM, glomerulus)
III. Discontinuous capillary or sinusoid characterised by incomplete basal lamina and gaps (larger than fenestrae) in endothelium (liver, spleen, adrenal gland). They are endothelial-lined channels with a larger diameter than capillaries with discontinuous or absent basement membranes.
Keywords/Mesh: cardiovascular system, blood vessel, artery, arteriole, capillary, venule, vein, histology, POJA collection
Title: Types of capillaries
Description: Text file shows classification of capillaries.
Capillaries in different locations are built differently according to functional requirements in the organs. The endothelium can be continuous or fenestrated. The basal lamina can be single and continuous or be fused from a double layer.
I. Capillaries with continuous endothelium (most common) and a closed basal membrane, i.e. somatic capillaries, non-fenestrated.
1.1. Continuous basal lamina (muscle, dermis)
1.2. Partly common (fused dual) basal lamina (alveolus lung)
1.3. Continuous lamina basalis +perivascular glial end-feet (blood-brain-barrier)
II. Capillaries with fenestrated endothelium pierced by pores, most frequent in gastrointestinal mucosa, endocrine tissue and renal glomeruli. The fenestrations can be provided with a thin diaphragm. The pores are about 20-100 nm wide.
II.1. Continuous basal lamina and fenestrae in endothelium (pancreas, intestinal villi)
II.2. Continuous fused dual basal lamina and fenestrae in endothelium (GBM, glomerulus)
III. Discontinuous capillary or sinusoid characterised by incomplete basal lamina and gaps (larger than fenestrae) in endothelium (liver, spleen, adrenal gland). They are endothelial-lined channels with a larger diameter than capillaries with discontinuous or absent basement membranes.
Keywords/Mesh: cardiovascular system, blood vessel, artery, arteriole, capillary, venule, vein, histology, POJA collection