Question
How does a skin graft receive nutrition on day 3 after transplantation?
| A. |
Imbibition |
| B. |
Inosculation |
| C. |
Neovascularization |
| D. |
A & B |
|
Correct Answer » D Explanation |
 |
Detailed Explanation:
Clinical Reasoning for the Correct Answer:
– On day 3 post-transplant, a skin graft is nourished by both imbibition and inosculation.
– Imbibition occurs during the first 48–72 hours, where the graft absorbs nutrients by diffusion from the wound bed.
– Inosculation begins around day 2–3, when graft vessels start to connect with vessels from the recipient site, allowing more direct nutrition.
Why Option A is Incorrect:
– Imbibition alone is mainly limited to the initial 48–72 hours.
– By day 3, inosculation has also started; thus, not the sole source at this time.
Why Option B is Incorrect:
– Inosculation starts as early as day 2–3, but in the absence of imbibition, initial graft survival would not be possible.
– Both processes overlap on day 3.
Why Option C is Incorrect:
– Neovascularization (new capillary ingrowth from host bed) occurs after inosculation, typically evident from day 4–7 onwards.
– Not a significant contributor to nutrition on day 3.
Why Option D is Correct:
– On day 3, both imbibition and inosculation contribute to graft survival and nutrition.
– This overlap is a classic teaching in skin graft physiology.