Consequently, in humans the urethra and vagina have separate external openings. While humans have a urogenital sinus during embryological development, it is lost except for the vestibule which is considered to be part of the external genitalia. The urogenital sinus then connects to the external genitalia. Urogenital Sinus – Pigs have a relatively long urogenital sinus formed by the fusion of the urethra with the vagina. It is the presence of these horns which allows pigs to have a litter of 8 or 10 pigs. These horns are sometimes confused with the much smaller Fallopian tubes. This means that the pig uterus has two large horns in addition to the body. Uterus – The fetal pig uterus is of a type called bicornate, compared to the simplex human uterus. – these other thoracic organs are basically the same in pigs and humans. Pericardium, vena cava, esophagus, phrenic nerve, etc. How many lobes are there in the lungs of the fetal pig? (See p. Quiz: Humans have three lobes in the right lung, two lobes in the left lung. Lungs – Like humans, pigs have multi-lobed lungs. It gradually shrinks, relative to the rest of the body, throughout life. All mammals have a large (enormous) thymus gland during the fetal stage. This is not a difference of pigs from other mammals. However, it is much larger than most students1 expect. Thymus – the thymus is found in the same areas in pigs as in humans. – the remainder of the abdominal organs found in the fetal pig are basically the same as found in humans. Stomach, spleen, bile duct system, small intestines, kidneys, bladder, etc. What other abdominal organs are retroperitoneal? (See p. Quiz: Like humans, the adrenal glands of the fetal pig are retroperitoneal. 45 of the FPDG.)Īdrenal glands – In the fetal pig, the adrenal glands are found near the aorta towards the cephalic end of the kidneys, instead of on top of the kidneys as is the case in humans. Intestines – there is a significant difference in the structure of the fetal pig colon compared to the human colon. The fetal pig liver has five lobes: right lateral, right central, left central, left lateral, and caudate. Liver – the human liver has four lobes: right, left, caudate and quadrate. There are small differences in a few organs. Pigs have all of the same thoracic and abdominal organs as humans. Quiz: How are the gluteal muscles of the pig different than the gluteal muscles of the human? See p. In the hip, however, there are some differences in the gluteal muscles. 35 of the FPDG ( Fetal Pig Dissection Guide). In the hind limb, the pig has the same muscles as humans in the major thigh muscle groups: quadriceps femoris and the hamstrings see p. There are some differences in the location of chest muscles that attach to the shoulder girdle. For example, the major chest and abdominal muscles found in humans are present in the pig. In almost every case, fetal pigs have the same muscles as humans, with some small variations in the size and location of some muscles related to the fact that pigs are quadrupedal and humans are bipedal. There are a some differences in structural details, mostly relatively minor in nature. With proper directions, they can all be readily found, especially with large, full term fetal pig specimens. Consequently, all of the major structures found in humans are present in the fetal pig. Veins return blood to the heart.Pigs are mammals. Arteries carry blood away from the heart. The arteries and veins are challenging to identify, especially if the pig is not injected with dye. If you have a female pig look at another group’s male pig and vice versa. Make sure you can locate:įinally in the abdominal cavity are the reproductive organs.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |