| venous adventitia | The adventitia (tunica adventitia) is the outer coat of the vessel, and consists of connective tissue, nerves and vessel capillaries (vasa vasorum). It links the vessels to the surrounding tissues [Gray's Anatomy]. | — |
| vein | Any of the tubular branching vessels that carry blood from the capillaries toward the heart [Brenda]. | — |
| vas deferens | A spermatic duct especially of a higher vertebrate that in the human male is a thick-walled tube about two feet (0.61 meters) long that begins at and is continuous with the tail of the epididymis and eventually joins the duct of the seminal vesicle to form the ejaculatory duct [Brenda]. | — |
| vagina | A canal in a female mammal that leads from the uterus to the external orifice of the genital canal [Brenda]. | — |
| utricle | The part of the membranous labyrinth of the inner ear into which the semicircular canals open [Brenda]. | utriculus |
| uterus | An organ of the female mammal for containing and usually for nourishing the young during development previous to birth [Brenda]. | — |
| uterine tube | The Fallopian tubes, also known as oviducts, uterine tubes, and salpinges (singular salpinx) are two very fine tubes lined with ciliated epithelia, leading from the ovaries of female mammals into the uterus, via the utero-tubal junction. In non-mammalian vertebrates, the equivalent structures are the oviducts [Wikipedia: http://en.wikipedia.org/wiki/Fallopian_tube]. | — |
| urogenital system | The urinary system and genital system considered together [Brenda]. | — |
| urinary system | The organs and passageways concerned with the production and excretion of urine, including the kidneys, ureters, urinary bladder, and urethra [Brenda]. | — |
| urethra | The tube through which urine leaves the body. It empties urine from the bladder [Brenda]. | — |
| ureter | The tube that carries urine from the kidney to the bladder [Brenda]. | — |
| upper limb | The upper limb or upper extremity is the region in an animal extending from the deltoid region to the hand, including the arm, axilla and shoulder [Wikipedia: http://en.wikipedia.org/wiki/Upper_limb]. | — |
| unclassifiable | — | — |
| umbilical vein | A vein that passes through the umbilical cord to the fetus and returns the oxygenated and nutrient blood from the placenta to the fetus [Brenda]. | — |
| umbilical cord | A cord arising from the navel that connects the fetus with the placenta [Brenda]. | — |
| ulna | The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form and runs parallel to the radius, which is shorter and smaller. In anatomical position (i.e. when the arms are down at the sides of the body and the palms of the hands face forward) the ulna is located at the side of the forearm closest to the body (the medial side), the side of the little finger [Wikipedia: http://en.wikipedia.org/wiki/Ulna]. | — |
| tympanum | The major portion of the middle ear (auris media), consisting of a narrow air-filled cavity in the temporal bone that contains the auditory ossicles. It communicates with the mastoid air cells and the mastoid antrum via the aditus and with the nasopharynx via the auditory tube. The middle ear and the tympanic cavity were formerly regarded as being synonymous [Brenda]. | — |
| tubule | A tubule is a very small tube or fistular structure. A system of surface-connected membranes in muscle that enables a nerve impulse to travel to the interior of the muscle fibre. In anatomy, a tubule is a minute tube lined with glandular epithelium [Wikipedia: http://en.wikipedia.org/wiki/Tubule]. | — |
| tuberomamillary nucleus | The tuber cinereum is a hollow eminence of gray matter situated between the mammillary bodies and the optic chiasm. The tuber cinereum is part of the hypothalamus [Wikipedia: http://en.wikipedia.org/wiki/Tuber_cinereum]. | — |
| trophoblast | A thin layer of ectoderm that forms the wall of many mammalian blastulas and functions in the nutrition and implantation of the embryo [Brenda]. | — |
| trochlear nucleus | The nucleus of the trochlear nerve is located in the midbrain, at the level of the inferior colliculus. It is a motor nucleus, so is located near the midline [Wikipedia: http://en.wikipedia.org/wiki/Trochlear_nucleus]. | — |
| trigeminal nucleus | One of the nuclei of the trigeminal nerve, consisting of a slender column of cells in the lateral central gray matter of the superior part of the fourth ventral and cerebral aqueduct. It is the only central nervous system site of primary sensory neurons; its cells resemble posterior root ganglion cells. The peripheral processes of the cells, which form the mesencephalic tract, carry proprioceptive impulses; the central processes have widespread cerebellar and brain stem connections, including the motor nucleus of the trigeminal nerve [Brenda]. | — |
| trapezoid nucleus | The trapezoid body is part of the auditory pathway. It is a bundle of fibers and cells in the pontine tegmentum. It consists of fibers arising from the ventral cochlear nucleus. A collection of nerve cells inside forms a trapezoid nucleus. The superior olivary nucleus is situated on the dorsal surface of the trapezoid body. Most nerve fibers pass directly from the superior olivary nuclei to the inferior colliculus [Wikipedia: http://en.wikipedia.org/wiki/Trapezoid_body]. | trapezoid body |
| tract | A neural pathway, neural tract, or neural face, connects one part of the nervous system with another and usually consists of bundles of elongated, myelin-insulated neurons, known collectively as white matter. Neural pathways serve to connect relatively distant areas of the brain or nervous system, compared to the local communication of grey matter [Wikipedia: http://en.wikipedia.org/wiki/Neural_pathway]. | neural pathway; neural tract; neural face |
| trachea | 1: The cartilaginous and membranous tube descending from the larynx and branching into the right and left main bronchi. It is kept patent by a series of about twenty transverse horseshoe-shaped cartilages. Called also windpipe.n2: One of a system of minute tubes ramifying throughout the body of a terrestrial arthropod and delivering air to the tissues. Called also tracheal tubule [Brenda]. | — |
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