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and disposed circularly around the vessel. These lamellae vary in number according to the size of the vessel; the smallest arteries having only a single layer, and those slightly larger three or four layers - up to a maximum of six layers. It is to this coat that the thickness of the wall of the
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293:, which are often slightly curved. Separating the tunica media from the outer tunica externa in larger arteries is the external elastic membrane (also called the external elastic lamina). This structure is not usually seen in smaller arteries, nor is it seen in veins.
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and collagen unite to form lamellae which alternate with the layers of smooth muscular fibers; these lamellae are united to one another by elastic fibers which pass between the smooth muscular bundles, and are connected with the fenestrated membrane of the inner
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Betts, J Gordon; Desaix, Peter; Johnson, Eddie; Johnson, Jody E; Korol, Oksana; Kruse, Dean; Poe, Brandon; Wise, James; Womble, Mark D; Young, Kelly A (June 8, 2023).
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The middle coat is composed of a thick layer of connective tissue with elastic fibers, intermixed, in some veins, with a transverse layer of muscular tissue.
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The white fibrous element is in considerable excess, and the elastic fibers are in much smaller proportion in the veins than in the arteries.
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The middle coat (tunica media) is distinguished from the inner (tunica intima) by its color and by the transverse arrangement of its fibers.
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Microphotography of arterial wall with calcified (violet colour) atherosclerotic plaque (H&E stain)
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Knowledge (XXG) articles incorporating text from the 20th edition of Gray's
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577:- Comparative Organology at University of California, Davis - "Bird, vessels (LM, High)"
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Steve, Paxton; Michelle, Peckham; Adele, Knibbs (2003).
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Anatomy photo: Circulatory/vessels/vessels7/vessels3
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544:A Learning System in Histology: CD-ROM and Guide
440:A Learning System in Histology: CD-ROM and Guide
407:A Learning System in Histology: CD-ROM and Guide
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58:of a child. (Tunica media is at 'm'.)
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346:Section of a medium-sized artery
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16:Middle layer of blood vessel
472:"The Leeds Histology Guide"
382:of the 20th edition of
214:Tunica media is made up of
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542:Vaughan, Deborah (2002).
438:Vaughan, Deborah (2002).
405:Vaughan, Deborah (2002).
186:for short, is the middle
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538:Histology image:05603loa
515:Anatomy & Physiology
434:Histology image:21103loa
401:Histology image:05102loa
72:Middle layer of wall of
945:Circulatory anastomosis
908:Internal elastic lamina
699:Precapillary resistance
548:Oxford University Press
444:Oxford University Press
411:Oxford University Press
694:Precapillary sphincter
485:Histology image: 66_02
230:on the inside and the
226:. It lies between the
202:on the inside and the
198:. It lies between the
158:Anatomical terminology
250:artery is mainly due.
506:available under the
91:tunica media vasorum
182:"middle coat"), or
855:Pulmonary arteries
789:Circulatory system
139:H3.09.02.0.01007
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309:Additional images
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234:on the outside.
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164:edit on Wikidata
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915:Tunica media
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649:Metarteriole
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115:A12.0.00.019
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22:Tunica media
903:Endothelium
888:Microvessel
851:Right heart
836:Right heart
820:Capillaries
682:Fenestrated
666:Capillaries
322:Artery wall
80:Identifiers
982:Categories
867:Left heart
816:Arterioles
804:Left heart
687:Sinusoidal
677:Continuous
364:References
56:epiglottis
845:Pulmonary
832:Vena cava
727:Deep vein
644:Arteriole
508:CC BY 4.0
281:, as the
257:, as the
180:Neo-Latin
993:Arteries
812:Arteries
798:Systemic
631:Arteries
612:Arteries
510:license.
380:page 498
247:lamellae
224:collagen
972:Anatomy
824:Venules
623:Vessels
277:In the
267:carotid
263:femoral
253:In the
241:In the
218:cells,
103:D017540
69:Part of
64:Details
54:of the
50:of the
958:Portal
747:Venule
673:Types
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388:(1918)
291:nuclei
265:, and
210:Artery
192:artery
188:tunica
44:artery
859:Lungs
828:Veins
808:Aorta
770:Lymph
757:Lymph
709:Veins
616:veins
540:from
436:from
403:from
378:from
283:aorta
274:coat.
259:iliac
184:media
162:[
151:55590
86:Latin
614:and
552:ISBN
519:ISBN
504:text
448:ISBN
415:ISBN
334:Vein
298:Vein
285:and
222:and
196:vein
174:The
127:3921
110:TA98
98:MeSH
48:vein
46:and
865:→ (
834:→ (
194:or
146:FMA
122:TA2
984::
861:→
857:→
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814:→
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462:^
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269:,
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134:TH
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604:e
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178:(
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
