Medicine
The uterus is a hollow, muscular, pear-shaped body, situated in the true pelvis. Its larger upper portion is termed the body or corpus uteri, and the smaller lower one the neck or cervix uteri, these two portions being separated by a constriction which is the narrowest part of the organ. The portion of the body which projects markedly above the entrances of the tubes is known as the fundus, and as the uterus is markedly flattened from before backward, an anterior and a posterior surface and two lateral margins may be recognized in it. The anterior surface is known as the vesical surface, the posterior more convex one as the intestinal surface, and the lateral margins as the right and the left. That portion of the cervix which projects into the vagina is termed the vaginal portion, while that situated above the vagina is called the supravaginal portion.
- Details
- Hits: 3251
Vision is the special sense of sight that is based on the transduction of light stimuli received through the eyes. The eyes are located within either orbit in the skull. The bony orbits surround the eyeballs, protecting them and anchoring the soft tissues of the eye.
- Details
- Hits: 22097
The urinary bladder is a sack-like dilatation of the urinary passages which serves as a collecting reservoir, the size and shape of which is dependent upon the degree of distention. Three chief portions may be recognized in it: the middle and larger portion of the bladder is the body; the upper portion, which is distinctly pointed, especially in the newborn, is the vertex; and the lowermost portion, directed toward the perineum, is called the fundus.
- Details
- Hits: 8830
The globe or ball of the eye is a composite structure of spheroidal form, placed in the fore part of the orbital cavity, and receiving the thick stem of the optic nerve behind. The recti and oblique muscles closely surround the greater part of the eyeball, and are capable of changing its position within certain limits: the lids, with the plica semilunaris and caruncle, are in contact with its covering of conjunctiva in front; and behind it is supported by a quantity of loose fat and connective tissue.
- Details
- Hits: 2747
The urine is secreted by the kidney, whence it passes successively through the renal pelvis, ureter, bladder, and urethra into the outer world.
- Details
- Hits: 4711
The parts which constitute the lachrymal apparatus are the following, viz.: - The gland by which the tears are secreted, situated at the upper and outer side of the orbit, together with its excretory ducts; the two canals into which the fluid is received near the inner angle: and the sac with the nasal duct continued from it, through which the tears pass into the inferior meatus of the nose.
- Details
- Hits: 1316
The pituitary or Schneiderian membrane, which lines the cavities of the nose, is a highly vascular mucous membrane, inseparably united, like that investing the cavity of the tympanum, with the periosteum and perichondrium, over which it lies. It is continuous with the skin through the nostrils; with the mucous membrane of the pharynx through the posterior apertures of the nasal fossae; with the conjunctiva through the nasal duct and lachrymal canaliculi; and with the lining membrane of the several sinuses which communicate with the nasal fossae.
- Details
- Hits: 1546
The eyelids (palpebrae) are moveable portions of integument, strengthened toward their margins by a thin lamina of dense fibrous tissue. A mucous membrane lines their inner surface, and is reflected thence in the form of a pellucid covering on the surface of the eyeball. This is named the conjunctival membrane or conjunctiva.
- Details
- Hits: 1789
These are the chief support of the outer part of the organ. They occupy the triangular opening seen in front of the nasal cavity in the dried skull, and assist in forming the septum between the nasal fossae. There are usually reckoned two large and three small cartilages on each side, and one central piece or cartilage of the septum.
- Details
- Hits: 1391
The fundamental elements of the urinary apparatus are the kidneys (french: les reins) - two glandular organs situated in the loins behind the peritoneum, each of which is provided with a duct - the ureter - for the passage of the secretion to a reservoir - the bladder - by which it is periodically expelled from the body through a tube of outlet - the urethra.
- Details
- Hits: 4256
The nasal fossae, and the various openings into them, with the posterior nares, have been previously described as they exist in the skeleton, and the greater part of that description is also applicable generally to the nose in a recent state; but it is proper to mention certain differences in the form and dimension of parts, which depend on the arrangement of the lining membrane, viz.
- Details
- Hits: 1522
The excretory duct of the kidney is a musculo-mucous canal, expanded and irregularly branched above, narrow and of fairly uniform dimensions in the rest of its course.
- Details
- Hits: 1824
The spleen is a large blood-vascular organ closely associated with the lymphatic system.