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 [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.

dar·tos fas·ci·a

a superficial fascial layer incorporating smooth muscular tissue in the integument of the scrotum; it also forms the scrotal septum.
See also: dartos muliebris, dartos muscle.


/dar·tos/ (dahr´tos)
1. dartos muscle.


the contractile tissue under the skin of the scrotum; called also tunica dartos.
References in periodicals archive ?
Using this technique, the zone B flap was folded twice to form double layers of dartos tissue, as a reliable waterproof barrier between urethra and skin.
A de-epithelialised ‘turnover dartos flap' in the repair of urethral fistula.
The fascia lata may act as a replacement for Dartos fascia, although this is probably clinically insignificant.
The dartos pedicle dissected from the dorsal foreskin was divided medially; one half was placed to cover the distal reconstruction and the remaining half to cover the proximal urethra.
An incision was established with a 1-mm margin around the tumour through skin to the level of the dartos fascia.
Proximally, for about 2cm circumferentially, the level of dartos fascial layer was undermined for tension-free advancement of the penile shaft skin.
The scrotal skin excised did not involve the dartos fascia.
The dartos flap from the lateral side and the skin flap from the proximal side of the fistula were created (Fig.
The tunica albuginea of testis, scrotal dartos and skin were closed in separate layers.