tunica muscularis


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Related to tunica muscularis: Muscularis externa, Muscular coat

tunica

 [too´nĭ-kah] (L.)
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.

muscular layer

[TA]
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.
Synonym(s): tunica muscularis [TA], muscular coat

tunica muscularis

The smooth muscle layer in the walls of organs such as the bronchi, intestines, and blood vessels.
See also: tunica

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.

tunica adventitia
the outer coat of various organs, blood vessels and other structures, usually made up of loose connective tissue.
tunica albuginea
a dense, white, fibrous sheath enclosing a part or organ, such as is present on the testis.
tunica albuginea ovarii
see tunica ovarii (below).
tunica conjunctiva
the conjunctiva.
tunica dartos
dartos.
tunica externa
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.
tunica intima
the innermost coat of blood vessels; called also Bichat's tunic.
tunica media
the middle coat of blood vessels.
tunica mucosa
the mucous membrane lining of various tubular structures.
tunica muscularis
the muscular coat or layer surrounding the tela submucosa in most portions of the digestive, respiratory, urinary and genital tracts.
tunica ovarii
capsule of dense collagenous tissue, underlying the covering epithelium, covers each ovary. Called also tunica albuginea ovarii.
tunica propria
the proper coat or layer of a part, as distinguished from an investing membrane.
tunica serosa
the membrane lining the external walls of the body cavities and coating the surfaces of intruding organs; it secretes a watery exudate.
tunica vaginalis
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).
tunica vasculosa
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.
References in periodicals archive ?
The tunica muscularis is composed of smooth muscle arranged in inner circular (cm) and outer longitudinal (lm) layers.
Villus height, crypt depth, epithelial cell height, ratio of villus height to crypt depth, tunica muscularis externa and tunica submucosa were analysed using a linear model including dietary treatment, region of the small intestine, and the interaction between dietary treatment and region as fixed effects, and piglet nested within diet as a random effect.
Tunica muscularis externa and tunica submuscularis thicknesses were affected by region only (p<0.
Given that other variables which can affect small intestine weight (small intestine length, thickness of tunica muscularis externa and tunica submucosa) were not affected by diet, a relative increase in epithelial mitosis could explain the simultaneous increase in crypt depth and small intestine weight in control pigs in the present experiment.
The most striking feature of this duct is the thin submucosal layer and thick, well-organized tunica muscularis varying from two distinct inner and outer layers to intermingled fibers.
The structure of the tunica muscularis varies along the length of the duct, ranging between three layers near the bladder and a striated urethral muscle in more distal sections, where it becomes continuous with the bulbospongiosus muscle.

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