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a tunic or coat; used in anatomic nomenclature to designate a membranous covering of an organ or a distinct layer of the wall of a hollow structure, as a blood vessel.
tunica adventi´tia the outer coat of various tubular structures.
tunica albugi´nea a dense white fibrous sheath that encloses a part or organ, such as the testicle or ovary.
tunica conjuncti´va the conjunctiva.
tunica dar´tos dartos.
tunica exter´na an outer coat, such as the fibroelastic coat of a blood vessel.
tunica inter´na an inner coat or layer.
tunica in´tima the innermost coat of a blood vessel; called also Bichat's tunic.
tunica me´dia the muscular middle coat of a blood vessel.
tunica muco´sa the mucous membrane lining of various tubular structures.
tunica muscula´ris the muscular coat or layer surrounding the tela submucosa in most portions of the digestive, respiratory, urinary, and genital tracts.
tunica pro´pria the proper coat or layer of a part, as distinguished from an investing membrane.
tunica sero´sa the membrane lining the external walls of the body cavities and reflected over the surfaces of protruding organs; it secretes a watery exudate.
tunica vagina´lis tes´tis the serous membrane covering the front and sides of the testis and epididymis.
tunica vasculo´sa a vascular coat, or a layer well supplied with blood vessels.
the muscular, usually middle, layer of a tubular structure; for most of the gastrointestinal tract, it consists of an outer longitudinal layer of muscle and an inner circular layer.
The smooth muscle layer in the walls of organs such as the bronchi, intestines, and blood vessels.
See also: tunica
pl. tunicae [L.] a covering or coat; a membranous covering of an organ or a distinct layer of the wall of a hollow structure, as a blood vessel. See also tunic.
the outer coat of various organs, blood vessels and other structures, usually made up of loose connective tissue.
a dense, white, fibrous sheath enclosing a part or organ, such as is present on the testis.
tunica albuginea ovarii
see tunica ovarii (below).
an outer coat, especially the fibroelastic coat of a blood vessel.
tunica flava abdominis
an extensive sheet of elastic tissue that helps to support the abdomen. It is conspicuous in large animals as a yellow corset over the ventral abdomen and is a modified part of the deep fascia and aponeurosis of the external abdominal oblique muscle. It contributes to the deep fascia for the mammary gland or the scrotum.
the innermost coat of blood vessels; called also Bichat's tunic.
the middle coat of blood vessels.
the mucous membrane lining of various tubular structures.
the muscular coat or layer surrounding the tela submucosa in most portions of the digestive, respiratory, urinary and genital tracts.
capsule of dense collagenous tissue, underlying the covering epithelium, covers each ovary. Called also tunica albuginea ovarii.
the proper coat or layer of a part, as distinguished from an investing membrane.
the membrane lining the external walls of the body cavities and coating the surfaces of intruding organs; it secretes a watery exudate.
the double-layered sleeve of peritoneum that lines the scrotum and inguinal canal (parietal layer) and invests the testis, epididymis and spermatic cord (visceral layer).
a vascular coat, or a layer well supplied with blood vessels, e.g. of the eye.
tunica vasculosa lentis
vascular envelope of the lens in the developing fetus.