Text Book Questions Flashcards
Satellite cells of muscle are activated under which of theses conditions?
All of the above:
Normal muscle fiber growth
Muscle fiber regeneration
Muscle fiber hypertrophy
Which cellular component of the epidermis is a peripheral outpost of the immune system and functions to present antigens to other immune cells?
Langerhans’ cells
Which structure is mesodermal in origin?
Arrector pili muscle
Craniosynostosis is caused by an abnormal developmental course of the…?
Cranial sutures
Which myogenic regulatory factor is expressed latest in the development of a muscle fiber?
MRF-4
In the let-down of milk during lactation, the myoepithelial cells contract in response to…?
Oxytocin
What component of developing skin determines the nature of hairs that form or the thickness of epidermis in fetus?
Dermis
Why is cranial bone typically not found over an area where part of the brain is missing?
Brain tissue induces formation of surrounding membranous skeletal elements
Which of the following molecules plays an important role in the determination of the dorsoventral axis of the developing limb?
Wnt-7a
What molecule is associated with myogenic cells migrating into the limb bud from the somites?
Pax-3
What is the principal function of the AER?
Stimulating outgrowth of the limb bud
In the developing limb the shh gene product is produced in the…?
ZPA
The connective tissue of the limb arises from the…?
Lateral mesoderm
The formation of clubfoot is associated with…?
Oligohydramnios
An infant whose mother underwent chorionic villus sampling during pregnancy was born with the tips of two digits missing. What is a possible cause?
Tear in amnion could have resulted in amnionic band wrapping around the tips of the digits