The loose connective tissue layer beneath the serous membrane that lines the ventral body cavity.
An incomplete layer of fibroblasts facing the synovial cavity, plus the underlying loose connective tissue.
One of the four primary tissue types; a layer of cells that forms a superficial covering or an internal lining of a body cavity or vessel.
A contractile tissue dominated by skeletal muscle fibers; characterized as striated, voluntary muscle.
Skeletal Muscle Tissue
A tissue characterized by the presence of cells capable of contraction; includes skeletal, cardiac, and smooth muscle tissues.
A specialized cell in the deeper layers of the stratified squamous epithelium of the skin; responsible for the production of melanin.
Cells of the central nervous system and peripheral nervous system that support and protect neurons; also called neuroglia.
Circulating granulocytes (white blood cells) similar in size and function to tissue mast cells.
A small blood vessel, located between an arteriole and a venule, whose thin wall permits the diffusion of gases, nutrients, and wastes between plasma and interstitial fluids.
A red blood cell; has no nucleus and contains large quantites of hemoglobin. See also erythrocyte.
Red Blood Cell (RBC)
Cartilage containing an abundance of collagen fibers; located around the edges of joints, in the intervertebral discs, the menisci of the knee, and so on.
A mode of secretion in which the glandular cell sheds portions of its cytoplasm.
A microphage (white blood cell) with a lobed nucleus and red-stained granules; participates in the immune response and is especially important during alergic reactions.
A simple squamous epithelium that lines one of the divisions of the ventral body cavity.
A compound whose dissociation releases a hydroxide ion (OH-) or removes a hydrogen ion (H+) from the solution.
The reticular tissue that underlies a mucous epithelium and forms part of a mucous membrane.
The enlargement of a cartilage or bone by the addition of cartilage or bony matrix at its surface.
A form of cartilage growth through the growth, mitosis, and secretion of chondrocytes in the matrix.
Cells of the central nervous system and peripheral nervous system that support and protect neurons; also called glial cells.
An epithelium that contains several layers of nuclei but whose cells are all in contact with the underlying basement membrane.
Connective tissue fibers, primarily collagenous, that form sheets or bands beneath the skin to attach, stabilize, enclose, and separate muscles and other internal organs.
A loosely organized, easily distorted connective tissue that contains several fiber types, a varied population of cells, and a viscous ground substance.
Loose Connective Tissue
Cells of connective tissue proper that are responsible for the production of extracellular fibers and the secretion of teh organic compounds of the extracellular matrix.
A microphage that is very numerous and normally the first of the mobile phagocytic cells to arrive at an area of injury or infection.
A goblet-shaped, mucus-producing, unicellular gland in certain epithelia of the digestive and respiratory tracts; also called goblet cells.
The basic histological unit of compact bone, consisting of osteocytes organized around a central canal and separated by concentric lamellae.
A squamous epithelium and the underlying loose connective tissue; the lining of the pericardial, pleural, and peritoneal cavities.
A layer of filaments and fibers that attach an epithelium to the underlying connective tissue.
Small packets of cytoplasm that contain enzymes important in the clotting response; manufactured in bone marrow by megakaryocytes.
Regions where adjacent cardiocytes interlock and where gap junctions permit electrical coupling between the cells.
Microscopic passageways between cells; bile canaliculi carry bile to bile ducts in the liver; in bone, canaliculi permit the diffusion of nutrients and wastes to and from osteocytes.
Longitudinal canal in the center of an osteon that contains blood vessels and nerves, a passageway along the longitudinal axis of the spinal cord that contains cerebrospinal fluid.
A bone cell responsible for the maintenance and turnover of the mineral content of the surroundin bone.
The layer that surrounds a cartilage, consisting of an outer fibrous region and an inner cellular region.
A gland that secretes onto the body surface or into a passageway connected to the exterior.
A nonspcific defense mechanism that operates at the tissue level; characterized by swelling, redness, warmth, pain, and some loss of function.
The fibrous sac that surrounds the heart; its inner, serous lining is continuous with the epicardium.
The predominant proteoglycan in cartilage, responsible for the gelantinous consistency of the matrix.
A connective tissue cell that, when stimulated, releases histamine, serotonin, and heparin, initiating the inflammatory response.
Muscle tissue in the walls of many visceral organs; characterized as nonstriated, involuntary muscle.
Smooth Muscle Tissue
A lubricating fluid that is composed of water and mucins and is produced by unicellular and multicellular glands along the digestive, respiratory, urinary, and reproductive tracts.
A cell in neural tissue that is specialized for intercellular communication through (1) changes in membrane potential and (2) synaptic connections.
A strong connective tissue containing specialized cells and a mineralized matrix of crystalline calcium phosphate and calcium carbonate; also called bone.
The layer that surrounds a bone, consisting of an outer fibrous region and inner cellular region.