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Reproductive system (Menstrual Cycle (Days 6-12 Proliferative phase/…

- - - - puberty/menopause- endo of meiosis 1 is triggered to form a secondary oocyte & first polar body/ hypothalamus release GnRH which stimulates FSH & LH causing ovarian cycle/ secondary oocyte undergoes meiosis 2 but stops until fertiliezed/ first polar body divides into 2 second polar bodies which have no function
- - - - prophase 1- Homologous maternal & paternal replicated chromosomes pair up/crossing over between maternal & paternal chromosomes nuclear membrane goes away
        
        metophase 1- homologous chromosomes line up/
        spindle fibers attach to the centromeres
        
        anaphase 1- maternal & paternal chromosomes are separated & pulled to opposite ends of the cell/ sister chromatids still attached
        
        telephase 1- nuclear division 2 new haploid nuclei/ half the number of chromosomes
  - - - prophase 2- nuclear membrane breakdown/
        chromatin becomes chromosomes
        
        Metophase 2- centrioles at opposite ends/ spindle
        fibers line up chromosomes at the equator
        
        Anaphase 2- sister chromatids are pulled apart now chromosomes are pulled to opposite ends of the cell
        
        Telaphase 2- nuclear membrane reformes/
        4 daughter cells contain 23 chromosomes
- - - - internal organs complete/ some function
      - extremities develop from limb buds
      - cartalige skeleton & maschles complete
      - Placenta & umbilical cord function
      - facial features & ears complete
      - human appearance
      - head grows
      - optic vessical appears
    - - Heart starts beating
      - Primitive streak
      - Somites form
      - Amnion covers embryo
      - Neural Tube develops
      - Chorion developed
      - Heart forming
    - - cartilage skeleton & muscle start developing
      - Facial features & ears develop
      - organs start forming
      - somites are present
      - spinal cord & brain start forming
      - derivatives of the 3 germ layers start forming
      - basic human body plan is established
      - cephalocaudal & lateral folding produce a cylindrical embryo
  - - - limbs become more proportionate to body
      - ossification in bones continue
      - body grows rapidly
      - Brain & skull continue to enlarge
    - - brain & skull are growing
      - limbs near final proportions
      - lernix caseosa covers skin
      - lanugo covers skin
      - Muscle movement become stronger & more frequent
    - - palate develops
      - epidermis & dermis become more developed
      - Brain enlarges
      - body elongates
      - coordination between nerves & muscles occur
      - permanent kidney develops
      - reproductive organs start developing
      - sex detected
      - bone begins to replace cartilage
    - - eyelids open
      - blood cells form in marrow
      - eyelashes & eyebrows appear
      - subcutaneous fat is deposited
      - Major weight gain
      - testes descend into scrotum
- - - - epididymis
        
        vas deferens
        
        seminal vessicles
        
        prostate
        
        bulbourethral gland
        
        ejaculatory duct
        
        1 more item...
- - - - fimbriae
        
        Fallopian tube
        
        uterus
        
        cervix
        
        vaginal canal
- - - - secondary spermatocyte- haploid 23 chromosomes
        
        completes meiosis 2 to produce speratids
        
        speratid- haploid 23 chromosomes/ undergoes spermogenesis/ most of cytoplasm is shed & the tail, midpiece & head forms
        
        Spermatozoon- haploid 23 chromosomes
        leaves seminiferous tubule & matures in epididymis