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Lecture 13

ANAT 214 Lecture 13: ANAT214_Lecture_13

9 Pages

Anatomy & Cell Biology
Course Code
ANAT 214
Louis Hermo

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Inguinal canal There are three layers of the anterior abdominal wall that make their way down to the pubic tubercle and the anterior superior iliac spine towards the inguinal ligament Lowest margin of the lower interior abdominal wall (medial) o It is the weakest part Medial aspect has an opening to a tube called the inguinal canal o The testis is formed in the posterior abdominal wall and is displaced all the way down to the scrotum through the three layers forming the inguinal canal Carries the three layers through the spermatic cord The midway between the anterior superior iliac spine and the pubic tubercle is the deep inguinal ring o The testis will follow the black like in the figure below, and enter the deep inguinal ring, to go through the inguinal canal and exit through the superficial ring near the pubic tubercle o The deep ring is always near the inferior epigastric artery Hernia o Indirect Something (intestinal structure) goes through the deep opening and through the canal and appears through the superficial opening Normal passage o Direct Something (intestinal structure) pierces the wall of the inguinal canal and appears through the superficial opening o Vulnerable during exertion, sports activity, if there is a weakness, there will be a bulge The external aponeurosis gives off the inguinal ligament and is continuous with the fascia around the spermatic cord Development The gut develops in the abdominal cavity which is very small, which can cause problems like the guts strangling each other, and there can be knots, so it needs to be organized The fact that the diaphragm forms very early on, allows for the organs to stay in the abdomen and not rise up to the thoracic cavity The umbilical cord is very large during development, so it needs space o The gut goes into the umbilical cord and then back into the abdominal cavity The abdominal cavity is a peritoneal cavity with a visceral layer that covers the organs, and a parietal layer that lines the wall Mesentery o The visceral peritoneum that suspends the gut to the posterior wall that contains the neurovascular bundle and lymphatics o Lined by mesothelium Retro-peritoneal structure o Behind the peritoneumo Behind the parietal peritoneum, not covered in mesothelium, it is attached to the posterior wall The duodenum, ascending colon and the descending colon Cross section of fetus The green layer is the mesothelium which is the parietal peritoneum on the edge and the visceral peritoneum on the developing gut The gut is suspended by the prolongation of the visceral peritoneum, that goes all the way to the posterior wall called the mesentery o The red is the aorta that shoots off a vessel that will supply the gut through the mesentery The whole gut is covered by mesothelium, which produces the serous fluid that allows the loose gut to move around o Pathology: excessive fluid can go into the abdominal cavi
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