Histology Lab Exam 2

Question 1

Simple Squamous ET

Answer 1

Taken from the kidney. The Glomerulus and Bowman’s Capsule are formed from simple squamous ET. The kidney tubules are made of simple cuboidal ET.

Question 2

Simple Cuboidal ET

Answer 2

Taken form the thyroid gland. Shows low versus high cuboidal tissue. The high cuboidal tissue is actively secreting colloid into the follicle.

Question 3

Simple Columnar ET

Answer 3

Taken from the small intestine. Note the cross section under low power for orientation. Note the villi. The simple columnar ET forms the mucosa (lining) of the villi. Also note the connective tissue within the villi. This connective tissue is called lamina propria and is a specialized type of loose CT

Question 4

Alveoli

Answer 4

Taken from the lung. Alveoli are made of simple squamous ET

Question 5

Thick Skin

Answer 5

This slide comes from skin. The epidermis of the skin is composed of keratinized stratified squamous ET. The upper most cells of the epidermis are dead, keratinized and anucleated. Below the epidermis is the dermis. The dermis is composed of dense irregular CT

Question 6

Stratified Squamous ET

Answer 6

This is actually nonkeratinized stratified squamous ET. This slide is taken form the esophagus. Compare this to the above slide. These cells are alive and contain nuclei.

Question 7

Simple Ciliated Columnar ET

Answer 7

This is taken from the oviduct (Fallopian tube). The cilia are difficult to see.

Question 8

Trachea

Answer 8

A few of these slides are actually a cross sections through the entire neck. As such, they show a cross section through the trachea and the esophagus. The trachea is lined with pseudostratified ciliated columnar ET (PSCCE); the esophagus is lined with nonkeratinized stratified squamous ET. Be sure to note both if your slide is of this type. Note the prominent goblet cells in the trachea. The trachea will be somewhat round and the esophagus is collapsed. Also note the hyaline cartilage which form the rings of the trachea. Many of these slides are just of the trachea, not the entire neck; in this case don’t look for the esophagus

Question 9

Transitional ET

Answer 9

This is a cross section through the ureter. The ureter is lined with transitional ET.

Question 10

Glandular ET

Answer 10

This slide, labeled Glandular ET in the index, is most likely labeled Pancreas on the slide. The slide of the pancreas shows the endocrine system cells called Islets of Langerhans, and the exocrine (digestive system) cells called acinar cells. See your textbook for a photomicrograph. The pancreas is discussed in more detail in the document called Histology Supplement

Question 11

Loose CT

Answer 11

This slide is labeled aorta. The elastic CT presents as sheets of elastic perpendicular to the wall of the vessel

Question 12

Reticular CT

Answer 12

Labeled spleen. The fibers are reticular fibers

Question 13

Elastic Cartilage CT

Answer 13

This slide is taken from an external ear. Starting at the top of the bottom, note the arrangement of tissue: epidermis, dermis, elastic cartilage, dermis, epidermis. Within the elastic cartilage note the lacunae and the elastic fibers.

Question 14

Fibrocartilage

Answer 14

Found in intervertebral disc, the symphysis pubis, and the menisci of the knee. The fibers are collagen and the chondrocytes appear as red splotches.

Question 15

Ground Bone

Answer 15

This is compact or dense bone. Locate a haversian system, lamellae, canaliculi, lacunae and osteocytes. We do not have a slide of spongy bone

Question 16

Muscle - 3 Types

Answer 16

This slide is not part of the histology practical. We will examine this slide in the muscular system. The slide shows the three types of muscle: skeletal, smooth and cardiac.

Question 17

Spinal Cord

Answer 17

This slide is not part of the histology practical. We will study this slide in the context of the central nervous system. The slide is a cross section of the spinal cord. It shows gray and white matter. Anterior horn motor neurons may be seen in the anterior horn of the gray matter

Question 18

Nerve Fibers

Answer 18

• This slide is not part of the histology practical. We will study this slide in the context of the nervous system. The slide shows nerve fibers.

Question 19

White Fibrous CT

Answer 19

This is dense regular connective tissue. The slide is labeled tendon. The smooth, parallel fibers are collagen fibers

Question 20

Blood Smear

Answer 20

Labeled Human Blood, Wright Smear. This is a slide of human blood. Note the erythrocytes - the majority of cells on the slide. They do not have a nucleus. The center, which may appear nucleated, is biconcave and thus appears to be a nucleus. The leukocytes (WBC’s) are generally larger and have a red or purple nucleus. The most common WBC’s are neutorphils or polymorphonucleocytes; they have a multilobed nucleus. There is a 70% chance that any WBC you find on the slide is a neutrophil. The small red fragment-like structures are thrombocytes

Question 21

Adipose CT

Answer 21

Labeled Adipose CT. Actually the adipose CT is not very good on this slide. To better see adipose CT use the slide of the ureter (#9) labeled Transitional ET. External to the transitional ET and the smooth muscle you will see adipose CT.

Question 22

NOTES

Answer 22

Two of the connective tissues for which you are responsible are on slides originally used in the context of epithelial tissues. The reason for this is that the slides are sections through organs and organs are composed of two or more tissues.

Studying two or more different tissues on the same slide helps one develop an understanding of the general arrangement of tissues. Additionally, it helps one learn the anatomy of the particular organ. Remember, the slides come from organs; they are usually not isolated blocks of tissue.

Question 23

Dense Irregular CT

Answer 23

Use the skin slide (#5). The dermis is largely composed of dense irregular CT.

Question 24

Hyaline Cartilage CT

Answer 24

Use the trachea slide (#8). The cartilage rings in the trachea are composed of hyaline cartilage. Note the chondrocytes within the lacunae