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VET 113- Anatomy + F
Pregnancy, Development, Lactation- chp 20
| Term | Definition |
|---|---|
| Zygote | the ovum once it is fertilized |
| Implantation | when blastocysts embeds itself in the endometrium, the placenta begins to form after this step. |
| Placenta | the life support system for the developing offspring, develops around the embryo |
| Umbilical Cord | connects the placenta to the embryo |
| Gestation | time from fertilization of the ovum to delivery of the newborn |
| 1st Trimester | the embryonic period, this is when the placenta develops |
| 2nd Trimester | the fetal development period, this is when body tissues/organs/systems develop |
| 3rd Trimester | the fetal growth period |
| Parturition | the birth process. Can be triggered by size, weight of the uterus and fetus, changing hormone levels. |
| Fetal Changes after birth | some changes include: lungs expanding and functioning, and the foramen ovale and ductus arteriosus close. |
| 1st Stage of Labor | uterine contractions occur, the myometrium contacts, fetus is pressed down against cervix, and the cervix gradually dilates |
| 2nd Stage of Labor | the actual delivery of the newborn. The amniotic/allantoic sacs of the placenta rupture, uterine and abdominal muscles contract in a rhythmic pattern, the newborn is delivered. |
| 3rd Stage of Labor | |
| Involution of the Uterus | |
| Cow Udder | |
| Alveoli | |
| Alveolar Duct | |
| Lactation | |
| Hormones involved in starting lactation | |
| Colostrum | |
| Lactation Maintenance | |
| Milk Letdown | |
| Diffuse Placental Attachment | when the attachment sites are spread diffusely over the whole surface of the placenta and the whole lining of the uterus (pigs, horses, camelids). |
| Cotyledonary Placental Attachment | the most complicated type of attachment, areas of attachment small discreet and numerous (cattle, sheep, goats). |
| Zonary Placental Attachment | when the placenta attaches to the uterus in a belt-shaped zone that encircles the placenta (dogs and cats). |
| Discoid Placental Attachment | when the area of attachment between the placenta and uterus is a single, discrete disc-shaped area (humans, primates, rabbits, rodents). |