Histology Revision Resource

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Del curso dictado por The University of Edinburgh

EDIVET: Do you have what it takes to be a veterinarian?

757 calificaciones

The University of Edinburgh

EDIVET: Do you have what it takes to be a veterinarian?

757 calificaciones

This course is for anyone interested in learning more about Veterinary Medicine, giving a “taster” of courses covered in the first year of a veterinary degree and an idea of what it is like to study Veterinary Medicine.

De la lección

An Introduction to Body Systems Anatomy

In this week, we will look at the anatomy of the body, and the teaching team to guide you through this part of the course are Professor Susan Rhind and Dr Gurå Therese Bergkvist. We recommend that you start with the overview reading under the week 2 overview. For this week we have split the core materials into four sections that we suggest you work through in the order presented.

An Introduction to Histology1:41

Histology in Action – the Skin8:01

Histology Revision Resource4:38

Conoce a los instructores

Dr Jessie Paterson
BSc (Hons) Agricultural Chemistry, PhD, PgDip
Lecturer in Student Learning
Kay Aitchison
BSc Agriculture (Hons Animal Production Science)
Lecturer in Farm Animal Husbandry
Prof Susan Rhind
BVMS, PhD, FRCPath, PFHEA, MRCVS
Professor of Veterinary Medical Education
Dr Gurå Therese Bergkvist
BSc Hons (Vet Sci), BVM&S, PhD, MRCVS
Lecturer, Preclinical Veterinary Sciences
Rachel Whittington
BVSC MRCVS
Lecturer in Professional Skills
Dr Catriona Bell
BVetMed, PhD, PGCAP, MRCVS
Senior Lecturer in Veterinary Education
Dr Andrew Gardiner
BVM&S, Cert SAS, MSc, PhD, MRCVS
Veterinary Clinical Senior Lecturer

So, in this extra resource, I'm just going to show you some more examples,

some more images of the key structures that we were talking about

when we were looking around the histological section.

Because the more times that you see things,

the more familiar it starts to become for you.

So here we return to the cat skin and

again this is a low power view just showing you again the location of

the epidermis here on the outside of the skin being pointed out by this arrow here.

The other thing I wanted to point out on this slide was the appearance of the fat

cells on a histological section.

So we said that the cytoplasm of these cells does not stain,

which is why this looks clear here.

Because the fat that was here has been lost in the processing of this section,

and so it doesn't stain.

But what you will see is a delicate line around the outside which is

marking the cell membrane of that particular cell.

And you will also see every so often a more darker blue round or

oval structure, that's the nucleus of these individual fat cells.

The other thing that's being pointed out in this section here is the base of

the hair follicle.

We talked when we drove around the section earlier on about hair follicles appearing

like this.

More superficially in the skin, but

bear in mind that hairs have to grow from somewhere so they grow from deeper down

in the dermis and this would be the base of a hair follicle here.

Now we go up on higher power again and

again just let you see again the epidermis on the outside with it's

varying number of layers, depending on where we are in the body.

A hair follicle in cross section here, and the collagen of the dermis,

this supporting structure that is sitting underneath

Here we have a different case now.

This is a section of dog skin, and various things that I'm pointing out to you here.

On the surface of the skin, there's been some hemorrhage,

where this biopsy has been taken.

Where this piece of skin has been taken, there's been some hemorrhage.

So this red staining material here, these are red blood cells that are sitting on

top of the skin here, and there are some more up around this area here and here.

The epidermis again is being pointed out to you here in this case.

Here's a hair follicle again here, this one's a little bit more dilated, and

there's a bit of a remnant of a piece of hair in this one, it's not so

discrete as the ones we were just looking at.

And again we've got the dermal collagen and the supporting connective tissue that

sitting underneath the epidermis just being pointed out to you here.

In this case here, we're now looking at the skin from sheep and just for interest,

Julia, again, we got the hair follicle here in the sheep's skin.

This structure that's surrounding it, this a very nice picture of this,

this is called a sebaceous gland.

And sebaceous glands are normal structures that produce a substance called sebum.

It helps to waterproof the coat and the hairs.

And you can see nicely in this section that this sebaceous gland is emptying

into this duct here.

So that it can then actually produce the sebum that gets onto the skin and

helps give the animal a nice waterproof coat.

And in this final section here, again,

we're pointing out the epidermis to you here.

Again, it's a bit thicker in this particular section here.

I also wanted to point out,

in this section of skin that we're looking at here, it's a bit inflamed.

This animal has an itchy skin, we have an itchy red kind of skin.

And so

what that means is that the individual blood capillaries become more obvious.

So this arrow here is pointing out to you a small blood capillary with three or

four individual red blood cells that you can actually see quite nicely

sitting within that structure.

Often in a section of skin we don't readily see at these capillaries.

Because if the skin's not inflamed then they tend to be quite quiescent and

they're not so easy to pick up.

And the other point, you may be able to detect in this section that

there's actually a lot more round and oval nuclear type structures around here.

These are nuclei of inflammatory cells.

Normally in the dermis,

I mentioned before the skin is an immunological active cite so it's got

cells in it ready to response if there's pathogens that need to be dealt with.

But in the normal skin there shouldn't be this number of these nuclei dotted around.

These are nuclei of lymphocytes and other types of inflammatory cells that

are around in this area because this animal has an inflamed skin.

So that's just a little bit of some extra resources and

extra idea about what other sorts of things we can see in the skin.

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