Exam 1 Histology Pictures

Simple squamous epithelium

Description: single layer or flattened cells with disc-shaped central nuclei and sparse cytoplasm.Simple of the epithelia.

Functions: allows materials to pass by diffusion and filtration in sites where protection is not imp.

Location: kidney, air sacs lungs, lining of heart

Simple cuboidal epithelium

Description: single layer of cubelike cells with large, spherical central nuclei

Function: secretion and absorption

Location: kidney tubules, ducts and secretory portions of small glands, ovary surface

simple columnar epithelium

Description: single layer of talls cells with round oval nuclei

Function: Absorption; secretion of mucus enzymes and other substances

Location: Digestive tract

Pseudostratified columnar epithelium

Description: single layer of cells of differing heights, some not reaching the free surface.

Function: secrete substances, particularly mucus

Location: upper respiratory tracts, lines th trachea, sperm-carrying ducts.

Stratified squamous epithelium

Description: thick membrane composed of several cell layers

Function: protects underlying tissues in areas subjected to abrasion

Location: esophagus, mouth and vagina.

Transitional epithelium

Description: basal cells cuboidal and columnar

Function: stretches readily,permits stored urine to distend urinary organ

Location: lines the ureters, bladder and part of the urethra

Connective tissue proper: loose connective tissue, areolar

Description: gel-like matrix with all three fiber types; fibroblast, macrophages,mast cells and some white cells.

Function: wraps and cushions organs

Location: under epithelia of body.

Connective tissue proper: loose connective tissue, adipose

Description: matrix as in areolar, but very sparse

Function: provides reserve food fuel

Location: under skin, around kidneys and eyeball, abdomen and breast

reticular

Description: loose network of reticular fibers in a gel-like ground substance

Function: fibers form a soft internal skeleton that supports other cells types including white blood cells, mast cells, and macrophages.

dense regular

Description: few elastic fibers

Function: attaches muscles to bones or to muscles

Location: tendons, most ligaments, aponeuroses

dense irregular

description: some elastic fibers

Function: withstands tension exerted in many directions

Location; organs and joints, dermis of skin, submucosa of digestive tract.

elastic

description: containing high portion of elastic fibers

Functions: allows tissue to recoil after stretching maintaining pulsatile flow of blood through arteries

Location: walls of large arteries.

Cartilage: hyaline

Function: supports and reinforces

Location: embryonic skeleton, costal cartilages of the ribs, trachea and larynx.

Cartilage: elastic

Function: Maintains the shape of a structure while allowing great flexibility

Location: support external ear

Cartilage: fibrocartiage

Function: tensile strength allows it to absorb compressive shock

Location: intervertebral discs, knee joint

other: bone (osseous tissue)

Function: supports and protects

Locations: bones

Connective tissue: Blood

function; transport respiratory gases, nutrients, wastes, and other substances.

Location: contained within blood vessels

skeletal muscle

Function: voluntary movement

Location: in skeletal muscles attached to bones or occasionally to skin

cardiac muscle

Function: as it contracts it propels blood into the circulation.

Location: the walls of the heart.

Smooth muscle

Function: propels substances or objects along internal passageways. (foodstuffs, urine, baby)

Location: mostly in the walls of hollow organs

Nervous tissue

Function: Neurons transmit electrical signals form sensory receptors and to effectors

Location: brain, spinal cord and nerves