Histology lab final part 3

White Pulp- Dark circular region found on the spleen; The rest (pink region) will be the red pulp

Red Pulp

The thymus of a newborn and adult.

-The adult thymus has adipocytes

Hassall's Corpuscle are concentrically arranged keratinized epithelioreticular cells.

Macrophages: large oval cells (red outline) that phagocytize T cells marked for removal; oval or indented nucleus (green outline); cytoplasm has visible vesicles (lysosomes; blue outlines)

Lymph vessels (valve visible)

Lymph nodes ; are bean-shaped, encapsulated structures, distributed throughout the body along the lymphatic vessels.

Peyer’s Patchers - aggregations of lymphatic follicles in the submucosa of the ileum (type of GALT).

Hard Palate

Orbicalaris Oris – a type of skeletal muscle

Filiform papilla- provide friction for holding food during mastication (absence of taste buds)

Folliate papilla -contains taste buds

Fungiform papilla-most numerous at the tip of the tongue; also contains taste buds

Circumvallate

Sublingual gland – abundant in mucous and might have serous demilune

Foliate papilla

1- tastebuds

2- Von ebner glands (serous salivary gland)

3- ducts

Pulp Cavity

Odontoblast secretes dentin

Ameloblast - secretes enamel

Esophageal Cardiac Junction

Stomach-Duodenal Junction

Recto-Anal Junction

Duodenum

Jejunum

Ileum

Goblet cells (seen as clear spaces; important for lubrication)

BD= bile duct – gets the bile that was carried by the bile canaliculi

CV=central vein – drains blood from the lobule ( blood exits the liver via the central veins)

HC=hepatic cord/plate (made of hepatocytes)

HT=hepatic (portal) triad – Contains a system of bile ducts and the branches of the hepatic artery ( supplies oxygenated  blood to liver) and hepatic portal vein.

PT=portal tract; made of bile duct, portal vein, and arteriole ( helps blood flow towards the liver ) [note: this refers to the connective tissue region that contains the triad vessels]

S= sinusoid- large capillaries CT: Connective Tissue

Red: Islets of Langerhans

Green region: Pancreatic acini (intralobular ducts) : Dark region surrounding the Islets of Langerhans (ducts located within the lobules).

Blue: Interlobular ducts; made of  cuboidal epithelium and are found within pancreatic lobes (ducts located outside of the lobules).

cortex - darker outer region

medulla - lighter inner region

renal pelvis - origin of the ureter (blue)

hilum - concave entry point of the kidney (right side of left picture)

Renal Papilla

Renal Cortex

Renal Medulla

Hilus

Renal Corpuscle

Bowman’s Capsule encloses the glomerulus

Bowman’s Space ( Purple) - the space between the parietal and visceral layers that receives the ultrafiltrate.

This specimen is section from the urinary bladder Epithelium: transitional epithelium (urothelium)

Male Urethra – remember it looks like a flower; and it is line with transitional epithelium; additionally, it contains adipocytes.

Female urethra- remember it looks like a happy face; have longitudinal folds and it is mostly lined with nonkeratinized stratified squamous epithelium with transitional epithelium at the proximal end and occasional patches of pseudostratified columnar epithelium. It also contains, Paraurethral glands (of Littré), found in the lamina propria, that secrete mucus to lubricate the mucosa.

Visceral Pleura- Outer surface of the lungs ( basically a serous membrane)

Made of simple squamous mesothelium and CT

Red-> mixture of conducting epithelium and respiratory epithelium.

Epithelium is a mixture of simple columnar and simple cuboidal epithelia.

Green- Alveolar sacs- spherical-like spaces with openings into multiple alveoli

Purple - Alveolar duct - arise from respiratory bronchioles and are passageways lined with alveoli and occasional regions of simple cuboidal epithelium.

Trachea- . It is a fibromuscular tube supported by 15 to 20 "C"-shaped hyaline cartilages

Green- Trachealis Muscle-  smooth muscle that spans the ends of tracheal cartilages. They control the diameter of the trachea.

Yellow- Sero-Mucous glands (tracheal glands) - add moisture to air and aid in trapping contaminants

Tunica albuginea- capsule of thick connective tissue.

Seminiferous tubules- Highly coiled, lined with germinal epithelium; site for sperm production (different stages of spermatogenesis visible)

1- corpus cavernosum (2 present in human males)

2- urethra

3- Corpus spongiosum

Corpus Cavernosa - - a pair of vascular channels located dorsally within the penis.

Corpus spongiosum- located ventrally within the penis

Purple - Tunica Albuginea - sheath of dense irregular connective tissue that surrounds the erectile bodies.

1- urethra

2- Corpus spongiosum

3- tunica albuginea

4- corpus cavernosum

Tubular acinar glands

Corpora amylacea