Integumentary system worksheet with answer key - Free Printable

Let’s go step by step to label the parts of the skin shown in the diagram. This is a cross-section of human skin, and each letter points to a specific structure.

We’ll match each letter with the correct anatomical term based on standard skin anatomy:

- A → Points to the outermost layer of the skin — that’s the epidermis.
- B → Points to the layer just below the epidermis — that’s the dermis.
- C → Points to the deepest layer shown, which contains fat — that’s the hypodermis (also called subcutaneous tissue).
- D → Points to a hair follicle — specifically, the part where the hair grows from — so it’s the hair follicle.
- E → Points to the sebaceous gland (oil gland) attached to the hair follicle — so it’s the sebaceous gland.
- F → Points to the arrector pili muscle — the tiny muscle that makes goosebumps — so it’s the arrector pili muscle.
- G → Points to a sweat gland — usually coiled and deep in the dermis — so it’s the sweat gland.
- H → Points to blood vessels in the hypodermis — so it’s blood vessels.
- I → Points to nerve endings or sensory receptors in the dermis/hypodermis — so it’s nerve endings.
- J → Points to adipose tissue (fat cells) in the hypodermis — so it’s adipose tissue.
- K → Points to the duct of the sweat gland going up to the surface — so it’s sweat duct.
- L → Points to the opening of the sweat gland on the skin surface — so it’s pore.
- M → Points to the stratum corneum — the very top dead cell layer of the epidermis — so it’s stratum corneum.
- N → Points to the living layers of the epidermis beneath the stratum corneum — so it’s stratum basale / germinativum (but often labeled as “epidermal layers” or simply “epidermis” if not specified; however, since A is already epidermis, N likely refers to the deeper epidermal layer — we’ll say stratum basale).
Wait — let’s double-check: In many diagrams, M is stratum corneum, and N is the rest of the epidermis (like stratum spinosum, etc.), but sometimes N is labeled as “epidermis” too. But since A is already pointing to the whole epidermis, perhaps N is meant to be the basal layer? Actually, looking again — A is pointing to the entire epidermis region, while M and N are sub-layers within it. So:

Actually, re-evaluating based on common labeling:

In most textbooks:
- M = Stratum Corneum (outermost dead layer)
- N = Stratum Basale (deepest living layer of epidermis)

But wait — in this diagram, A is pointing to the entire pinkish upper layer — that’s the epidermis. Then M and N are subdivisions inside it. So:

→ M = Stratum Corneum
→ N = Stratum Basale (or sometimes called Stratum Germinativum)

But let’s check O, P, Q, R:

- O → Points to the shaft of the hair above the skin — so it’s the hair shaft.
- P → Points to the root of the hair inside the follicle — so it’s the hair root.
- Q → Points to the bulb at the base of the hair follicle — so it’s the hair bulb.
- R → Points to the papilla — the bump at the bottom of the hair bulb that supplies nutrients — so it’s the dermal papilla.

Now let’s compile all answers carefully:

A – Epidermis
B – Dermis
C – Hypodermis (Subcutaneous Layer)
D – Hair Follicle
E – Sebaceous Gland
F – Arrector Pili Muscle
G – Sweat Gland
H – Blood Vessels
I – Nerve Endings
J – Adipose Tissue
K – Sweat Duct
L – Pore
M – Stratum Corneum
N – Stratum Basale
O – Hair Shaft
P – Hair Root
Q – Hair Bulb
R – Dermal Papilla

Note: Sometimes "Stratum Basale" is also called "Stratum Germinativum", but "Stratum Basale" is more commonly used now.

Also, for H, I, J — they’re all in the hypodermis area, so their labels are correct as blood vessels, nerve endings, adipose tissue.

Final check: All 18 letters are accounted for.

──────────────────────────────────────

Final Answer:
A – Epidermis
B – Dermis
C – Hypodermis
D – Hair Follicle
E – Sebaceous Gland
F – Arrector Pili Muscle
G – Sweat Gland
H – Blood Vessels
I – Nerve Endings
J – Adipose Tissue
K – Sweat Duct
L – Pore
M – Stratum Corneum
N – Stratum Basale
O – Hair Shaft
P – Hair Root
Q – Hair Bulb
R – Dermal Papilla