Lectures 1 & 2 - Embryology of the Cardiovascular System Flashcards
Describe the shape of embryos.
C-shaped curved bodies in varying age-dependent degrees (especially in the first 2 months)
Where is the face of an embryo located at first? How does this evolve?
It faces the heart and then as the neck develops, the face will erect
Is there a standard reference position for embryos like the anatomical position?
NOPE
Cranial side of embryo?
Toward back of head
Caudal side of embryo?
Toward lower limbs
Dorsal side of embryo?
Toward the back
Ventral side of embryo?
Toward the front
What are the 2 axes of embryos?
- Cranial/caudal
2. Ventral/dorsal
What is the anterior portion of the embryo?
Same as cranial
What is the anterior portion of the adult?
Same as ventral
What is the posterior portion of the embryo?
Same as caudal
What is the posterior portion of the adult?
Same as dorsal
What is the inferior portion of an embryo?
Same as ventral
What is the superior portion of an embryo?
Same as dorsal
Describe the axis seen via an adult MRI.
Feet coming at you
Head inside the picture
Describe the axis seen via an embryonic microscopy section? What is important to note?
Cranial side coming at you
Caudal side inside the picture
Note: the dorsal side is SUPERIOR to the ventral side
Where is the heart located inside the body?
In the center of the thorax with its apex to the left side.
Where is the aorta located relative to the heart?
Up towards the head, near the vertebral column-encased spinal cord/neural tube
Where are the atria and ventricles of the heart located?
- Ventricles: most inferior and anterior
2. Atria: most superior and posterior
How does the zygote receive nutrition prior to implantation? What is the rate dependent on?
By diffusion
Rate of diffusion dependent on surface area available between the egg and the environment AND the efficiency of the exchange mechanism
Describe the 7 steps from ovulation to implantation.
- Unfertilized ovum in metaphase II is released from the ovary into the ampulla
- Ovum resides in ampulla for 2/3 days
- Fertilization by sperm to give zygote
- Cleavage divisions without new cytoplasm
- Zygote with 64-128 cells enters uterus => morula
- Fluid filled cavity develops in morula => blastocyst
- Implantation into uterine wall
What is the largest cell in the body?
Ovum
What is the smallest cell in the body?
Sperm
What is the purpose of the cavity formation in the morula to give the blastocyst?
Diffusion of nutrients is too difficult and becomes less efficient due to the high number of cells in the morula