Week 3: Embryology

Question 1

All of the nerves developing segmentally on each side of the body can potentially have 4 types of fibres:

Answer 1

1. Somatic sensory
   
   2. Somatic motor
   3. Visceral sensory
      
      4. Visceral motor

Question 2

The major tissue supplied by somatic motor nerves is…

Answer 2

muscle and dermis

Question 3

Modalities carried by sensory somatic nerves:

Answer 3

pain, temperature, touch, proprioception

Question 4

Teratogenic effects change over time - explain the differences

Answer 4

first 2 weeks - all or nothing effect
1st trimester - facial differences
2nd and 3rd trimester - neurocognitive delay, growth differences

Question 5

gestational age vs embryonic age

Answer 5

Gestational Age = Time since the last menstrual period (assuming regular 28 day cycle w/ ovulation day 14)
= embryonic age + 2 weeks