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Loose connective tissue with an open framework.

Areolar Tissue

The loose connective tissue layer beneath the serous membrane that lines the ventral body cavity.

Subserous Fascia

An incomplete layer of fibroblasts facing the synovial cavity, plus the underlying loose connective tissue.

Synovial Membrane

The central space within a duct or other internal passageway.

Lumen

The serous membrane that lines the peritoneal cavity.

Peritoneum

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.

Epithelium

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.

Muscle tissue

A specialized cell in the deeper layers of the stratified squamous epithelium of the skin; responsible for the production of melanin.

Melanocyte

Cells of the central nervous system and peripheral nervous system that support and protect neurons; also called neuroglia.

Glial cells

Containing several layers.

Stratified

Proteoglycans situated between adjacent epithelial cells.

Intercellular Cement

A molecule containing two or more elements in combination.

Compound

Connections between cells that permit electrical coupling.

Gap Junctions

The epidermis and papillary layer of the dermis.

Cutaneous Membrane

Circulating granulocytes (white blood cells) similar in size and function to tissue mast cells.

Basophils

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.

Capillary

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.

Fibrous Cartilage

A mode of secretion in which the glandular cell sheds portions of its cytoplasm.

Apocrine Secretion

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.

Eosinophil

A simple squamous epithelium that lines one of the divisions of the ventral body cavity.

Mesothelium

A compound whose dissociation releases a hydroxide ion (OH-) or removes a hydrogen ion (H+) from the solution.

Base

A connective tissue with a gelatinous matrix that contains an abundance of fibers.

Cartilage

The invasion and colonization of body tissues by pathogens.

Infection

The reticular tissue that underlies a mucous epithelium and forms part of a mucous membrane.

Lamina Propria

The thick, collagenous tissue that forms at an injury site.

Scar Tissue

A carbohydrate component of proteoglycans in the matrix of many connective tissues.

Hyaluronan

The enlargement of a cartilage or bone by the addition of cartilage or bony matrix at its surface.

Appositional Growth

A form of cartilage growth through the growth, mitosis, and secretion of chondrocytes in the matrix.

Interstitial Growth

Loose connective tissue dominated by adipocytes.

Adipose Tissue

To increase in diameter; to enlarge or expand.

Dilate

Phagocytic agranulocytes (white blood cells) in the circulating blood.

Monocytes

Cells of the central nervous system and peripheral nervous system that support and protect neurons; also called glial cells.

Neuroglia

A gland that secretes hormones into the blood.

Endocrine Gland

The serous membrane that lines the pleural cavities.

Pleura

An epithelium that contains several layers of nuclei but whose cells are all in contact with the underlying basement membrane.

Pseudostratified Epithelium

The extracellular fibers and ground substance of a connective tissue.

Matrix

A blood vessel that carries blood away from the heart and toward a peripheral capillary.

Artery

A small pit or cavity.

Lacuna

A sensory process of a neuron.

Dendrite

Connective tissue fibers, primarily collagenous, that form sheets or bands beneath the skin to attach, stabilize, enclose, and separate muscles and other internal organs.

Fasciae

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.

Fibroblasts

A microphage that is very numerous and normally the first of the mobile phagocytic cells to arrive at an area of injury or infection.

Neutrophil

A fat cell.

Adipocyte

A blood vessel carrying blood from a capillary bed toward the heart.

Vein

A goblet-shaped, mucus-producing, unicellular gland in certain epithelia of the digestive and respiratory tracts; also called goblet cells.

Mucous Cell

The basic histological unit of compact bone, consisting of osteocytes organized around a central canal and separated by concentric lamellae.

Osteon

Proteoglycans responsible for the lubricating properties of mucus.

Mucins

A squamous epithelium and the underlying loose connective tissue; the lining of the pericardial, pleural, and peritoneal cavities.

Serous Membrane

Without blood vessels.

Avascular

The study of tissues.

Histology

A layer of filaments and fibers that attach an epithelium to the underlying connective tissue.

Basal Lamini

Small packets of cytoplasm that contain enzymes important in the clotting response; manufactured in bone marrow by megakaryocytes.

Platelets

Regions where adjacent cardiocytes interlock and where gap junctions permit electrical coupling between the cells.

Intercalated Discs

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.

Canaliculi

The simple squamous epithelial cells that line blood and lymphatic vessels.

Endothelium

An epithelium containing a single layer of cells above the basal lamina.

Simple Epithelium

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.

Central Canal

A bone cell responsible for the maintenance and turnover of the mineral content of the surroundin bone.

Osteocyte

The fluid contents of lymphatic vessels, similar in composition to interstitial fluid.

Lymph

The layer that surrounds a cartilage, consisting of an outer fibrous region and an inner cellular region.

Perichondrium

The granulocytes of whole blood.

White Blood Cells (WBCs)

A fluid that diffuses across a serous membrane and lubricates opposing surfaces.

Transudate

A gland that secretes onto the body surface or into a passageway connected to the exterior.

Exocrine Gland

The elongate extension of a neuron that conducts an action potential.

Axon

A nonspcific defense mechanism that operates at the tissue level; characterized by swelling, redness, warmth, pain, and some loss of function.

Inflammation

The fibrous sac that surrounds the heart; its inner, serous lining is continuous with the epicardium.

Pericardium

A collection of specialized cells and cell products that performs a specific function.

Tissue

The predominant proteoglycan in cartilage, responsible for the gelantinous consistency of the matrix.

Chondroitin Sulfate

A connective tissue cell that, when stimulated, releases histamine, serotonin, and heparin, initiating the inflammatory response.

Mast Cell

Cells that produce exocrine or endocrine secretions.

Gland

Muscle tissue in the walls of many visceral organs; characterized as nonstriated, involuntary muscle.

Smooth Muscle Tissue

A cartilage cell.

Chondrocyte

An activated B cell that secretes antibodies; plasmocyte.

Plasma Cell

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.

Mucus (noun)

Dense bone that contains parallel osteons.

Compact Bone

The substance secreted by synovial membranes that lubricates joints.

Synovial Fluid

A cell in neural tissue that is specialized for intercellular communication through (1) changes in membrane potential and (2) synaptic connections.

Neuron

Flattened.

Squamous

A strong connective tissue containing specialized cells and a mineralized matrix of crystalline calcium phosphate and calcium carbonate; also called bone.

Osseous Tissue

The layer that surrounds a bone, consisting of an outer fibrous region and inner cellular region.

Periosteum

A cell of the lymphoid system that participates in the immune response.

Lymphocyte

An epithelium whose superficial cells are flattened and platelike.

Squamous Epithelium

The connective tissue framework of an organ; distinguished from the functional cells (parenchyma) of that organ.

Stroma

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