OB test 2 study guide-beth ch 12 - Male Reproductive System External Genitals o Penis Hypospadius abnormally placed meatus on the penis Epispadius

OB test 2 study guide-beth ch 12 - Male Reproductive System...

This preview shows page 1 - 4 out of 9 pages.

Male Reproductive System - External Genitals o Penis Hypospadius – abnormally placed meatus on the penis Epispadius – meatus is on the upper dorsum of the penis o Scrotum - Internal Genitals o Testes o Epididymus o Accessory glands Seminal vesicles Prostate gland Bulbourethral glands Urethral - Neuro-hormonal aspects of spermatogenesis o Hypothalamus o Anterior pituitary o Testes o Testosterone o Semen Conception and Fetal Development Cell division - Mitosis – somatic cells - Meiosis – new organism (New Me!) - Gametogenesis – production of eggs/sperm o Oogenesis – development of the egg o Spermatogenesis – development of sperm Begins at puberty - Fertilization – chemical signal results in 2 nd meiotic division o Nucleus of egg forms Fertilization - Site of fertilization is ampulla of fallopian tube - Two tissue layers surround the egg o Zona pellucida Undergoes change at fertilization Prevents polyspermia When polyspermia happens it can cause a molar pregnancy o Corona radiata - Hyaluronidase/hyaluronic acid o Contained in head of sperm to break down zona pellucida
Image of page 1
- Capacitation – the removal of the glycoprotein coat of the sperm head which promotes fertilization o Must be removed by fertilization o Removed as sperm passes through the uterus and fallopian tubes - Twins o Dizygotic Fraternal 2 eggs and 2 sperm Not always the same gender As genetically similar as siblings born at different times o Monozygotic Identical 1 egg and 1 sperm Always the same gender In the first 1-8 days after fertilization into 2 separate beings Intrauterine Development - Cellular multiplication and differentiation o Cleavage – rapid cell division that makes the morula o Morula Blastocyst – inner mass that develops into embryo and amnion (amniotic fluid) Trophoblast – outer mass that develops into the chorion o EPF – early pregnancy factor o Implantation/Nidation Occurs 7-9 days after fertilization, in the 3 rd to 4 th day in the uterus Decidua (base portion of the endometrium) is called the basalis after implantation - Cellular differentiation o Embryonic Membranes Protect and support the embryo Chorion (Thick) Forms embryonic portion of placenta Fingerlike projections are the chorionic villi Amnion (thin) Protective membrane Encapsulates the amniotic fluid o Cushion/protection for baby o Also called “bag of waters” o Mantains stable temperature o At 10 weeks, there should be 30 mL, at 9 months, there should be between 700 and 1000 mL o Helps with the baby’s growth to prevent the baby’s body parts from sticking together o Baby will swallow and urinate amniotic fluid
Image of page 2
o Yolk sac forms RBC’s until 6 weeks when the liver takes over that job o Primary germ layers is where all of the major organs are formed o Oligohydramnios – too little amniotic fluid (less than 400 mL) Body part adhesion may result o Cord around neck Nuchal cord x1 or x2 - Intrauterine Organ Systems o
Image of page 3
Image of page 4

You've reached the end of your free preview.

Want to read all 9 pages?

  • Fall '12
  • ProfessorGregory
  • Nursing, Sperm, progesterone, abnormal gene, Sperm adequacy test

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes