Dermatomes Flashcards
1
Q
What is a dermatome?
A
Strip of skin innervated by single spinal nerve
2
Q
By when has the trilaminar disk been established and the mesoderm differentiated into its different types in embryogenesis?
A
~Day 20
3
Q
Where is the paraxial mesoderm?
A
Directly adjacent to neural tube
4
Q
Into what does the paraxial mesoderm differentiate?
A
Somites
5
Q
How many somites are there?
A
44 pairs, however 13 break down, leaving 31 pairs
6
Q
To what do the pairs of somites correspond in the adult body?
A
31 pairs of spinal nerves
7
Q
Where is the sclerotome in a somite?
A
Ventral aspect
8
Q
Of what is the sclerotome a precursor?
A
Ribs
Vertebral column
9
Q
Where is the dermomyotome in a somite?
A
Dorsal aspect
10
Q
Into what does the dermomyotome differentiate?
A
Dermotome forms dermis
Myotome proliferates
