Embryology

Question 1

Embryonic origin

Answer 1

Ectoderm

Question 2

In the young embryo, a linear thickening of ectoderm appears called the ____ at ____ AOG, which extends from the ____ obliquely to the ____

Answer 2

• Ectoderm
• Milk ridge (or milk lines)
• 5th or 6th weeks
• Axilla
• Inguinal region

Question 3

Supernumerary nipples

Answer 3

Polythelia

Question 4

The presence of more than two breasts

Answer 4

Polymastia

Question 5

Congenital absence of one or both nipples

Answer 5

Athelia

Question 6

Condition where one or both of the mammary glands is absent (the nipple and areola remain present)

Answer 6

Amazia

• Keywords:*
• Nipple and areola remain present

Question 7

Features of ipsilateral breast and nipple hypoplasia and/or aplasia, deficiency of subcutaneous fat and axillary hair, absence of the sternal head of the pectoralis major muscle, hypoplasia of the rib cage, and hypoplasia of the upper extremity

Answer 7

Poland syndrome

Question 8

The medial aspect of both breasts are bridged by soft tissue across the midline at the sternum (no cleavage)

Answer 8

Symmastia