Histology practical Flashcards
what epithelium do you see in the oesophagus on 10x and 40x power
stratified squamous non keratinised
innermost mucosal lining of the oesophagus
epithelium has multiple layers of flat cells with centrally located nucleus which appears purple
which structure is stained purple in the oesophagus epithelium and why does it take hematoxylin stain
nucleus
basophilic structures stain purple as they have an acidic component such as DNA
binds to the basic stain
4 layers of the gut from inside to outside
mucosa
submucosa
musculares externa
serosa/adventitita
outermost layer in oesophagus
adventitia
function of the oesophagus
food pipe
allows food to go into the stomach by help of mucus and involuntary muscular movements
epithelium in human skin
stratified squamous epithelium, keratinised
multiple layers of flat cells with centrally located basophilic nucleus and underlying basement membrane/basal lamina
which layer of the skin has keratinised stratified squamous epithelium
epidermis
how is epithelium in the skin different from the epithelium in the oesophagus
has a keratin layer on the top
stratum corneum
name of the layer below epidermis, which sublayer is closest to epidermis
dermis
papillary dermis close to epidermis
functions of the epidermis tissue
protection
thermoregulation
prevents loss of moisture
epithelium in the duodenum
simple columnar
single layer of tall columnar cells
single purple nucleus
epithelial surface specialisation in the duodenum mucosa
villi
classical feature that distinguishes the duodenum from other gut tissues
burners glands in the submucosa layer
secrete mucus which has bicarbonate ions in them that help with the neutralisation of acidic contents coming from the stomach
functions of the duodenum
absorption of food/nutrients from intestine into the blood
where is pseudo stratified columnar ciliated epithelium found
trachea
classical feature that distinguishes pseudo stratified epithelium and the significance of it
presence of cartilaginous ring, hyaline cartilage
presence of oesophagus posteriorly
function of cilia in tracheal epithelium
presence of cilia and goblet cells allows mucociliary clearance
cartilaginous cells in pseudostratfied epithelium
hyaline cartilage
functions of the pseudo stratified epithelium
air/wind pipe
part of the conducting airway
carries air in and out of the lung
eosinophilic structures in the medulla of the thymus
eosinophilic masses are called hassalls corpuscle
why does the Cortex appear more basophilic than the medulla
as the cells are closely packed together in the cortex
what could the basophilic structures in the thymus be
lymphocytes
functions of the thymus tissue
maturation of T cells
thick middle layer of the aorta and what is its function
elastic fibers
elastic recoil of the artery
thick middle layer name of the aorta
tunica media
functions of the aorta
main elastic artery carries blood from the left ventricle to the rest of the body via different muscular arteries
what is the white space in the middle of the tonsil called
crypt
invagination of epithelium
what epithelium is present in palatine tonsil
stratified squamous non keratinised
functions of the tonsil tissue
provides immunity/defence as it acts as a secondary lymphoid organ
MALT
what is MALT
mucosa associated lymphoid tissue
