The tumble left him with neck and back fractures and a cracked rib.
The jockey was thrown off his horse Pico Boulevard early into a novice race on the all weather card.
The George Peckham-trained two-year-old was making his racecourse debut and was sadly put down after the incident.
Muscutt's agent Paul Clarke said: "Danny has suffered a neck fracture, has fractures to his back and a cracked rib.
"They are clean fractures which I think is why no surgery is needed. What is wrong with him will heal, however long it takes.
"You have to look at the positives in these situations. He has no head injury."
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