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Does the tissue have a free surface? (Number 2! Do the cells look columnar…
Does the tissue have a free surface?
Yes! epithelium
is there a single distinct layer of cells?
no? simple cuboidal or simple columnar epithelium. go to B
Yes? Simple squamous epithelium
No.. pseudo stratified or stratified epithelium go to 2
No! This means it could be connective or muscle tissue. now go to B
B. Do the cells seem square with a round nucleus in the center?
No.. Simple columnar epithelium now go to C
C. Do the cells appear rectangular with an oval nucleus?
no? reconsider your options
yes? columnar epithelium
are there cilia at the apical surface?
Yes! ciliated simple columnar epithelium
No? Simple columnar epithelium
yes? simple cuboidal epithelium
Number 2! Do the cells look columnar and nuclei are staggered?
no.. stratified epithelium go to 3
yes! pseudo stratified columnar epithelium continue
are there cilia present at the apical surface?
no pseudo stratified columnar epithelium
yes cilia pseudo stratified columnar epithelium
Q3! to the cells at the apical surface appear flat?
no.. stratified cuboidal or stratified columnar epithelium go to b
do the cells at the apical surface appear square with a round nucleus
no.. stratified columnar epithelium go to C
C. Do the cells at the apical surface appear rectangular?
yes stratified columnar epithelium. continue below
are there cilia at the apical surface?
no stratified columnar epithelium
yes.. ciliated stratified columnar epithelium
yes.. stratified cuboidal epithelium
yes! simple squamous epithelium continue on
do the cells at the apical surface contain nuclei
no.. nonkeratinized stratified squamous epithelium
yes.. keratinized stratified squamous epithelium
do you see relatively few cells that appear to be separated by extracellular material?
no go to C
yes.. connective tissue or nervous tissue.
do you see a large cell shaped like a many-pointed star?
no.. connective tissue continue on
do you see concave cells with no apparent nucleus
no connective tissue proper, cartilage or bone. go on
are there lacunae
no, connective tissue proper. go on to 4
are there large round cells with their nuclei pushed to the outside and a big empty appearing space in the center of the cell
2 more items...
yes cartilage or bone
are the lacunae arranged in concentric rings
2 more items...
yes, blood connective tissue
yes nervous tissue
do there appear to be hot dog bun-shaped structures
no. Muscle
do the cells lack striations
no. skeletal or cardiac
do you see intercalated discs
no. skeletal muscle
yes. Cardiac muscle
yes smooth muscle
yes.. nervous tissue