![]() Positive numbers denote a lower fetal station, closer to the vaginal introitus.It consists of 7 cervical vertebrae, 12 thoracic vertebrae, and 5 lumbar vertebrae and is limited cranially by the skull and caudally by the sacrum. How high (or low) the presenting fetal part is compared to the maternal ischial spine Spine The human spine, or vertebral column, is the most important anatomical and functional axis of the human body. ![]() Uterus, Cervix, and Fallopian Tubes: Anatomy starts at > 2 cm → effaces to paper thin (full effacement) Externally, the cervix is lined by stratified squamous cells however, the cervical canal is lined by columnar epithelium. The most inferior portion of the uterus is the cervix, which connects the uterine cavity to the vagina.
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