Assessment 6- Animal Anatomy

Terms in this set (99)

consists of a muscular body, cervix (neck), and two horns (horns are long in polytocous species that have litters- like dogs and pigs)
-relatively proportions of each compartment vary considerably with species
--Relative to the extent of the horns, the body of the uterus is largest in the mare, less extensive in the ruminant and small in the sow(because they have large uterine horns)

-The mucosa lining the uterus, the endometrium, is highly glandular tissue that varies with thickness and vascularity with hormonal changes in the ovary and with pregnancy (Thickest during ovulation, is reabsorbed in animals that do not get their period and is shed in animals that do get a period)

--caruncles are present even on the lining of the non-pregnant ruminant uterus--
-Uterine glands are tubular glands, active during estrus and pregnancy, during which they produce a fluid known as uterine milk
-Secretions are important to survival of preimplantation embryo

-The myometrium is the muscular portion of the uterine wall
-During pregnancy the amount of muscle in the uterine wall increases dramatically, both in cell size (hypertrophy) and in cell number (hyperplasia)
-Helps push the baby out when in labor

-Lining of the uterus changes under the influence of estrogen and progesterone. It becomes thick leading up to and round time of ovulation in order to prepare to receive and nourish a fertilized ovum. If pregnancy does not occur, lining is lost-menstruation in primates. Most do not show any or much blood because lining is simply reabsorbed by body