文档介绍：Pelvis and Contents
ans and System
Bony Pelvis
2 Pelvic = Coxal = Innominate bones fused together
Each Pelvic bone
Ilium
Ischium
Pubis
3 parts join to form acetabulum
Sacrum and yx help create pelvis and form pelvic cavity
Function
attaches lower limb to axial skeleton
supports viscera
transmits weight of upper body
Use lab work to learn bony landmarks of pelvis
Contents of Pelvic Cavity
True Pelvis
below pelvic brim
space contains
part colon
rectum
bladder
uterus/ovaries (females)
False Pelvis
iliac blades
above pelvic brim
contains ans
attachment for muscles + ligaments to body wall
Pelvic Diaphragm = levator ani + ygeus m
Sexual Dimorphism in Pelvis
Cavity is broad, shallow
Pelvic inlet oval + outlet round
Bones are lighter, thinner
Pubic angle larger
yx more flexible, straighter
Ischial tuberosities shorter, more everted
Cavity is narrow, deep
Smaller inlet + outlet
Bones heavier, thicker
Pubic angle more acute
yx less flexible, more curved
Ischial tuberosities longer, face more medially
Female
Male
Sexual Dimorphism in Pelvis
Perineum
Diamond-shaped area between
Pubic symphysis (anteriorly)
yx (posteriorly)
Ischial tuberosities (laterally)
Males contain
Scrotum, root of penis, anus
Females contain
External genitalia, anus
Development of ans
Gonadal ridge: forms in embryo at 5 weeks and gives rise to gonads
Both ducts are present in embryo-only one develops!
Wolffian ducts: form male ducts
vas deferens, epididymis
Mullerian ducts: form female ducts
uterus, oviduct, vagina
External genitalia develops from same structures
Labioscrotal swelling: Scrotum = Labia major
Urethral folds: Penile Urethra = Labia minor
Genital tubercle: Penis = Clitoris
Development of Reproductive Structures
Mouse development
Male Development
Male fetus
Testes descend partially at 3 months, finish at 7 months into scrotum
Vaginal Process: outpocketing of peritoneum forms tunica vaginalis
Gubernaculum: fibrous cord; attaches bottom of scrotum to testes
Testes Descent: