Childbearing Anatomy Flashcards
What hormone influences woman’s monthly cycles?
estrogen
What part of the body protects the pelvic bone during intercourse?
mons pubis
What protects underlying structures and is rich in sebacious glands, lubricates?
labia majora
What is rich in blood and nerves that provide sexual enjoyment? Secretes smegma (odor sexually stimulating for men)?
clitoris
What lubricates vaginal vestibule facilitating intercourse?
paraurethral glands
What produces the clear thick alkaline pH that enhances viability and mobility of sperm?
Bartholin’s glands
What is the wedge shaped area between the vagina and anus called?
perineum
What are the target organs for estrogen?
ovaries, fallopian tubes and uterus
What shape is the uterus?
pear shaped
What is the normal position of the uterus? and what is it held in place by?
antiverted
ligaments
The uterus is divided into two parts. Name these parts.
corpus
isthmus
Which part of the uterus makes up the upper 2/3?
corpus
What is the corpus made mostly of?
smooth muscle (myometrium)
What part of the uterus makes the lower 1/3 and is the site of a c-section?
isthmus
What is the rounded top of the uterus called?
fundus
What are the 3 layers of the uterus called?
perimetrium
myometrium
endometrium
What is the outermost layer layer called and what is it composed of?
perimetrium
composed of peritoneum
What is the middle layer of the uterus called? how many parts is it made of?
myometrium
3 parts
Name 3 functions of the myometrium
- continuous with fallopian tubes, vagina and ligaments
- helps organs to present in unified reaction during ovulation and orgasm
- all layers act as a whole
What is the outer layer of the myometrium responsible for? what direction are the fibers?
has longitudinal muscles and causes cervical effacement, expels fetus during birth
What is the middle layer of the myometrium responsible for? what direction are the fibers?
surrounds large blood vessels and acts as a tourniquet to stop bleeding after birth, figure 8 pattern of fibers
What is the inner layer of the myometrium responsible for? what direction are the fibers?
acts as a sphincter at the at fallopian tubes and internal os of cervix and inhibits expulsion of uterine contents and stretches during dilation in labour, circular pattern of fibers.
Describe the endometrium?
inner layer of uterus and acts under influence of hormones, is a mucous membrane
What is the neck of the uterus? how long is it?
cervix
2.5 cm
What function does the cervix provide? What is the entrance of the cervix made up of?
provides protective entrance to the uterus
internal and external os
What function does the internal os provide?
- mucous secreting glands
- lubricates vagina
- bacteriostatic action
- alkaline environment at ovulation for sperm
Where is the site of fertilization?
fallopian tubes
What are 2 almond shaped structures called?
ovaries
What type of environment does the vagina provide?
acidic environment
What does the pelvic floor support? what is it made of?
- supports vagina, pelvic viscera and sling for rectum and anus
- comprised of 6 muscles
What function does the pelvic floor provide during the 2nd stage of labour?
directs the presenting part of the fetus forward under the pubic arch
What part of the vagina does the pelvic floor make up?
1/3 of the posterior part of the vagina
What exercise is important to do to keep the pelvic floor strong?
kegals
What are the benefits of doing Kegals?
- will help isolate muscles during birth - relax them
2. decreases stress incontinence and increases sexual pleasure for both parties
What supports the weight of an enlarged pregnant uterus and directs the presenting part of the fetus into the true pelvis? and is located above the pelvic brim?
false pelvis
What is made up of the sacrum, coccyx, ilium, ischium, and pubis bones?
true pelvis
What is important for the passage during labour & delivery?
relationship between true pelvis and presenting part
What are the 3 parts of the true pelvis
pelvic inlet
pelvic cavity
pelvic outlet
Describe the pelvic inlet
the upper border of true pelvis and is usually rounded
Describe the pelvic cavity
curved canal with longer posterior than anterior wall
Describe the pelvic outlet
lower body of true pelvis, measured by intertuberous diameter and pubic arch
What are the 4 types of pelvis’? and identify if they are favourable shapes for birthing.
- gynecoid - favourable
- android - not favourable
- anthropoid - favourable
- platypelloid - not favourable
In the android and platypelloid pelvic shapes which way does the baby enter the pelvis?
transverse
What are the 5 bones on a fetus skull?
2 frontal
2 parietal
1 occipital
What is the overlapping of bones called?
molding
What are the membrane spaces between bones on the skull called?
sutures
Where is the frontal suture located?
between the two frontal bones
Where is the sagittal suture located?
between the two parietal bones
Where is the coronal suture located?
between the frontal and parietal bones
Where is the lambdoidal suture located?
between the occipital and parietal bones
What are the fontanelles?
intersections (posterior and anterior) between sutures
Describe the fontanelle in the anterior portion of the fetal skull
large diamond shaped
allows for growth of the brain
closes at about 18 months of age
Describe the fontanelle in the posterior portion of the fetal skull
triangular shaped
closes at about 8-12 weeks of age
What is the fetal chin called?
mentum
What is the anterior area of the brow called?
sinciput
What is the large diamond shaped fontenelle called? (2 names)
anterior (bregma)
What is the area between the anterior and posterior fontenelles called?
vertex
What is the intersection between the posterior cranial sutures called?
posterior fontanelle
What section is occupied by the occipital bone and underneath the posterior fontanelle?
occiput
What is the edematous swelling of soft tissue of the scalp called in a fetus? and what causes it?
caput succedaneum
result of long difficult labour or vaccum extraction
How long does caput succedaneum last for?
fluid is reabsorbed within 12 hours to a few days
Does caput succedaneum cross suture lines?
yes
What is the collection of blood resulting from ruptured blood vessels between the surface of the cranial bone and periosteal membrane called? and what causes it?
cephalohematoma
caused by a more traumatic birth
Does cephalohematoma cross suture lines?
no
When is cephalohematoma present? and when does it disappear
usually appears several hours after delivery
disappears about 6 weeks after delivery
What might cephalohematoma increases chances of?
jaundice