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			File:Cholesterol_embolus_-_very_high_mag.jpg\|Cholesterol embolus - very high magnification
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2024-05-19T18:40:46Z

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[[image:Cholesterol_embolus_-_very_high_mag.jpg|thumb|left]] '''Internal elastic lamina''' (IEL) is a key structural component of the [[arterial wall]] found in [[blood vessels]]. It is a thin layer of elastic tissue that forms the boundary between the [[tunica intima]] and the [[tunica media]] in arteries. The internal elastic lamina plays a crucial role in maintaining the structural integrity and elasticity of blood vessels, allowing them to withstand the pulsatile pressure of blood flow.

==Structure==
The internal elastic lamina is composed primarily of [[elastin]], a highly elastic protein that allows tissues to resume their shape after stretching or contracting. The IEL appears as a wavy, fenestrated (perforated) layer under a microscope, which facilitates the diffusion of nutrients and oxygen from the [[lumen]] of the blood vessel to the cells in the [[tunica media]].

==Function==
The primary function of the internal elastic lamina is to provide elasticity and structural support to the arterial wall. This elasticity is essential for the normal function of arteries, as it allows them to expand and contract with each heartbeat, helping to maintain consistent blood pressure and flow. The fenestrations in the IEL also enable communication and exchange of substances between the [[tunica intima]] and [[tunica media]].

==Clinical Significance==
The integrity of the internal elastic lamina is crucial for vascular health. Damage or degradation of the IEL can lead to various [[vascular diseases]], such as [[atherosclerosis]] and [[aneurysms]]. In [[atherosclerosis]], the buildup of [[plaque]] can disrupt the IEL, leading to reduced elasticity and increased risk of vessel rupture. In [[aneurysms]], the weakening of the IEL contributes to the abnormal dilation of the blood vessel wall.

==Histology==
In histological sections, the internal elastic lamina can be visualized using special staining techniques, such as [[Verhoeff-Van Gieson stain]], which highlights elastic fibers. The IEL is typically more prominent in larger arteries, such as the [[aorta]], compared to smaller arteries and arterioles.

==Related Structures==
The internal elastic lamina is part of the larger structure of the arterial wall, which also includes the [[tunica intima]], [[tunica media]], and [[tunica externa]]. The [[external elastic lamina]] is another elastic layer found between the [[tunica media]] and [[tunica externa]] in some arteries, providing additional structural support.

==See Also==
* [[Tunica intima]]
* [[Tunica media]]
* [[Tunica externa]]
* [[Elastin]]
* [[Atherosclerosis]]
* [[Aneurysm]]

[[Category:Anatomy]]
[[Category:Cardiovascular system]]
[[Category:Histology]]

{{Anatomy-stub}}

Internal elastic lamina - Revision history

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