Types of Animal Tissues

Vocabulary flashcards covering the four primary animal tissue types (epithelial, connective, muscular, and nervous tissue), their specific classifications, anatomical examples, and specialized cell structures.

Epithelial Tissue

A primary animal tissue type consisting of simple, stratified, pseudostratified, transitional, and glandular forms that cover body surfaces and line cavities.

Simple Squamous Epithelium

A single layer of flat, scale-like cells found in sites requiring passive diffusion, such as the lungs (alveoli).

Simple Cuboidal Epithelium

A single layer of cube-shaped cells with central spherical nuclei, typically found in organs such as the kidneys.

Simple Columnar Epithelium

A single layer of tall, column-shaped cells found lining organs such as the stomach.

Stratified Squamous Epithelium

Multiple layers of cells with flattened surface cells that protect underlying tissues, found in areas subject to abrasion such as the esophagus.

Stratified Cuboidal Epithelium

A multi-layered epithelial tissue consisting of cube-shaped cells, located in sweat glands.

Stratified Columnar Epithelium

Epithelial tissue composed of multiple layers of columnar cells, found lining structures such as salivary ducts.

Pseudostratified Columnar Epithelium

A single layer of column-shaped cells appearing layered due to differing cell heights and nuclear positions, located in the trachea.

Transitional Epithelium

A specialized stratified epithelium capable of stretching and distending, found in the bladder.

Loose Connective Tissue

Connective tissue proper characterized by fewer collagen fibers, more ground substance, and high flexibility; functions to cushion tissues, support organs, and wrap blood vessels and nerves.

Areolar Tissue

A loose connective tissue containing loosely organized fibers that cushions, wraps, and provides flexible support to structures.

Adipose Tissue

A loose connective tissue predominantly composed of adipocytes that stores energy, cushions organs, and provides insulation.

Reticular Connective Tissue

A loose connective tissue featuring a network of fine branching fibers that forms the supportive framework for lymph nodes, the spleen, and bone marrow.

Dense Connective Tissue

Connective tissue proper characterized by abundant collagen fibers, little ground substance, high tensile strength, and toughness to resist pulling forces.

Dense Regular Connective Tissue

Dense connective tissue containing parallel collagen fibers designed to resist tension in one direction; forms tendons and ligaments.

Dense Irregular Connective Tissue

Dense connective tissue containing randomly arranged collagen fibers that provide multidirectional strength; found in the dermis of the skin.

Elastic Connective Tissue

Dense connective tissue containing wavy elastic fibers that allow stretch and recoil; found in large arteries and elastic ligaments.

Cartilage Tissue

A specialized connective tissue containing chondrocytes embedded in a matrix; includes hyaline cartilage and fibrocartilage.

Osteocytes

Mature bone cells located within the concentric matrix of bone tissue.

Osteoblasts

Bone cells responsible for forming the bone matrix.

Blood (Vascular Tissue)

A specialized circulating connective tissue composed of a liquid medium (plasma), erythrocytes (red blood cells), leucocytes (white blood cells), and thrombocytes (platelets).

Skeletal Muscle Tissue

Voluntary muscle tissue characterized by long, cylindrical, multinucleated cells with prominent striations and darker lines.

Cardiac Muscle Tissue

Involuntary muscle tissue composed of interconnected, branching networks of striated cells containing intercalated discs.

Smooth Muscle Tissue

Involuntary muscle tissue consisting of non-striated, spindle-shaped cells.

Nervous Tissue

A primary animal tissue type consisting of neurons—characterized by a cell body (soma), dendrites, and an axon—and supporting cells that transmit electrical impulses.

Cilia (Cilium)

Cellular surface projections that exhibit coordinated back-and-forth movement.

Flagella

Cellular appendages capable of movement that produce a propeller motion.

Microvilli (Microvillus)

Microscopic cellular surface projections specialized for increasing surface area as part of cell differentiation.