The histologist is looking for

thymus samples from adults for his new project. He finds a few paraffin blocks

that are not properly labelled. He takes the stained glass attached to the

blocks and looks on them under a microscope. The slide consist mainly of

adipose tissue. It is possible to distinguish well the connective tissue

capsule and the signs of incomplete septa. The lobes are, however, filled

mainly with fat. Only residues of the tissue itself are present. A dark cortex

is visible, with remnants of lighter medulla with Hassall bodies in the middle.

Is it possible to conclude from this description to whom this specimen belongs

and whether the pathologist can use it in his study?

A 34-year-old patient presents to the Department

of Ophthalmology. Recently, he has been seeing small spots, dots, lines, or

irregular shapes entering the field of vision that appear to be floating in the

front of the eye. He doesn't know what they are and these spots make him

nervous. The doctor explains that these are tiny floaters of various shapes

that are associated with degenerative changes in the vitreous. These opacities

are very common and are usually harmless. The vitreous maintains the shape of

the eyeball and stabilizes it. The jelly-like consistency of the vitreous also

holds the retina in position and prevents it from detaching. Vitreous contains

a very high proportion of water and also hyaluronic acid, which gives it its

typical consistency. Select the correct statement about the formation of

vitreous humour.

A 35-year-old man presents with a spastic-type of

paralysis in the

right lower extremity, visual impairment in his right eye, and fatigue. Magnetic resonance imaging (MRI) confirms areas of patchy demyelination in specific areas of the left cerebral hemisphere. The product of which of the following cells is specifically targeted in this condition?

An 8-year-old boy is

brought by his mother to the emergency. While playing with his younger sibling,

his brother hits him in the face with a toy. Unfortunately, in addition to

scraping his skin, he also hit him in the eye. The boy is examined and

fortunately only the superficial corneal epithelium was scratched. The eye is

therefore closed and bandaged to remain closed for the next 1-2 days. The

superficial corneal epithelium has a great ability to rapid regenerate and

during this time it will recover. What kind of epithelium is it?

A 68-year-old patient presents to a

dermatologist. He is bothered by a small, light-coloured growth near his left

eye. The dermatologist is rightly concerned that it is a basal cell carcinoma,

which is confirmed by the pathologist after the tumour is removed. Basal cell

carcinoma is a skin tumour arising from keratinocytes of the stratum basale.

This tumor combines some features of both malignant and benign tumours. Which

statement about normal cells of stratum basale is true?