Tissues

The human body as well as that of other animals (Species) is highly structured into organs and tissues which serve specific functions. Tissue is the organizational level intermediate between cells and organs system which compose the whole organism. All the tissues and cell types defined in an animal organism are hierarchical structured and shall be fully described. o

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  • name description synonyms
    cerebral aqueduct The mesencephalic duct, also known as the aqueductus mesencephali, aqueduct of Sylvius or the cerebral aqueduct, contains cerebrospinal fluid (CSF), is within the mesencephalon (or midbrain) and connects the third ventricle in the diencephalon to the fourth ventricle within the region of the mesencephalon and metencephalon, located dorsal to the pons and ventral to the cerebellum [Wikipedia: http://en.wikipedia.org/wiki/Cerebral_aqueduct].
    fourth ventricle The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. The fourth ventricle extends from the cerebral aqueduct (aqueduct of Sylvius) to the obex, and is filled with cerebrospinal fluid (CSF). The fourth ventricle has a characteristic diamond shape in cross-sections of the human brain. It is located within the pons or in the upper part of the medulla [Brenda].
    dura mater The tough fibrous membrane covering the brain and the spinal cord and lining the inner surface of the skull. It is the outermost of the three meninges that surround the brain and spinal cord [Brenda].
    arachnoid The arachnoid mater, is one of the three meninges, the protective membranes that cover the brain and spinal cord. It is named after the Greek words "Arachne" and suffix "-oid" -"in the image of", and "mater" the Latin word for mother, because of the fine spider web-like appearance of the delicate fibres of the arachnoid which extend down through the subarachnoid space and attach to the pia mater. It is interposed between the two other meninges, the more superficial dura mater and the deeper pia mater, from which it is separated by the subarachnoid space. The delicate arachnoid layer is attached to the inside of the dura and surrounds the brain and spinal cord. It does not line the brain down into its sulci (folds), as does the pia mater, with the exception of the longitudinal fissure, which divides the left and right cerebral hemispheres. Cerebrospinal fluid flows under this membrane in the subarachnoid space. The pia mater covering the brain is referred to as the "arachnoidea encephal", and the portion covering the spinal cord as the "arachnoidea spinalis". The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges. ("Lepto"- from the Greek root meaning "thin"). Similarly, the dura in this situation is called the pachymeninx [Wikipedia: http://en.wikipedia.org/wiki/Arachnoid_mater].
    pia mater The fine vascular membrane that closely envelops the brain and spinal cord under the arachnoid and the dura mater [Brenda].
    macula lutea An irregular yellowish depression on the retina, about 3 degrees wide, lateral to and slightly below the optic disk; it is the site of absorption of short wavelengths of light, and it is thought that its variation in size, shape, and coloring may be related to variant types of color vision [Brenda]. macula; macula of retina
    fovea centralis The fovea centralis, also generally known as the fovea (the term fovea comes from the Latin, meaning pit or pitfall), is a part of the eye, located in the center of the macula region of the retina [Wikipedia: http://en.wikipedia.org/wiki/Fovea_centralis].
    auricle Auricle is an Anglicization of Latin auricula, from auris "ear" and -cula, a diminutive suffix [Wikipedia: http://en.wikipedia.org/wiki/Auricle]. In animal anatomy, the pinna (Latin for feather) is the visible part of the ear that resides outside of the head (this may also be referred to as the auricle or auricula) [Wikipedia: http://en.wikipedia.org/wiki/Pinna_(anatomy)]. pinna; auricle; auricula
    external acoustic meatus The ear canal (external auditory meatus, external acoustic meatus) (meatus acusticus externus) , is a tube running from the outer ear to the middle ear. The adult human ear canal extends from the pinna to the eardrum and is about 35 mm in length and 5 to 10 mm in diameter [Wikipedia: http://en.wikipedia.org/wiki/Ear_canal].
    osseous labyrinth The bony labyrinth or osseous labyrinth consists of three parts: the vestibule, semicircular canals, and cochlea. These are cavities hollowed out of the substance of the bone, and lined by periosteum; they contain a clear fluid, the perilymph, in which the membranous labyrinth is situated [Wikipedia: http://en.wikipedia.org/wiki/Bony_labyrinth]. bony labyrinth
    membranous labyrinth The receptors for the senses of equilibrium and hearing are housed within a collection of fluid filled tubes and chambers known as the membranous labyrinth. The membranous labyrinth is lodged within the bony labyrinth and has the same general form; it is, however, considerably smaller and is partly separated from the bony walls by a quantity of fluid, the perilymph [Wikipedia: http://en.wikipedia.org/wiki/Membranous_labyrinth].
    seminiferous tubule One of two or three twisted, curved tubules in each lobule of the testis in which spermatozoa develop [Brenda].
    renal corpuscle A mass of arterial capillaries enveloped in a capsule and attached to a tubule in the kidney [Brenda].
    renal tubule One of the minute, reabsorptive, secretory, and collecting canals, made up of basement membrane lined with epithelium, that form the substance of the kidneys [Brenda].
    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].
    blastocyst inner cell mass In early embryogenesis of most eutherian mammals, the inner cell mass (abbreviated ICM and also known as the embryoblast or pluriblast, the latter term being applicable to all mammals) is the mass of cells inside the primordial embryo that will eventually give rise to the definitive structures of the fetus. This structure forms in the earliest steps of development, before implantation into the endometrium of the uterus has occurred. The ICM lies within the blastocoele (more correctly termed "blastocyst cavity," as it is not strictly homologous to the blastocoele of anamniote vertebrates) and is entirely surrounded by the single layer of cells called trophoblast [Wikipedia: http://en.wikipedia.org/wiki/Inner_cell_mass]. inner cell mass

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