Pectoral Region and Shoulder Flashcards
Also has some embryology
1
Q
When do somites originate?
A
3rd week
2
Q
When does mesoderm differentiate?
A
Day 20
3
Q
How many pairs of somites?
A
44
4
Q
Subdivisions of somites
A
-Sclerotome: Precursor to bone and cartilage (ribs and vertebrae)
-Dermomyotome
5
Q
Segmental distribution of myotomes is seen when?
A
6 weeks
6
Q
When do upper limb buds appear as elevations (and what level)?
A
4th week, C5-T1
7
Q
How long after upper limb buds do lower buds appear?
A
2 weeks after
8
Q
When do limbs undergo 90 degree torsion?
A
7 weeks
9
Q
Syndactyly
A
Fusion of 2 or more digits
10
Q
Polydactyly
A
Extra digits
11
Q
Macrodactyly
A
Enlarged digits
12
Q
Adactyly
A
Absence of digits
13
Q
Ectrodactyly
A
Lobster claw deformity
14
Q
Amelia
A
Complete absence of one or more extremities
15
Q
Meromelia
A
Partial absence of one or more extremities
