Laparoscopic abdominal anatomy of foals positioned in dorsal recumbency.

The researchers conduct a study on eleven foals to assess the normal abdominal anatomy through a laparoscopic examination. The findings demonstrate the effectiveness of the procedure as it allows a comprehensive observation of several abdominal structures but falls short in identifying some intestinal segments.

Study Population and Methodology

• The study was conducted on eleven foals that were positioned in dorsal recumbency, meaning they were lying on their back.
• The foals’ ages ranged from 1 to 150 days, with nine of them being cadavers and the other two anesthetized.
• The research used a laparoscopic procedure which involved making small surgical incisions to insert a Verres needle, instrument portals, and a laparoscope. The sites of these insertions were carefully selected to avoid causing any trauma to the umbilical structures.
• The foals’ abdominal cavity was then insufflated, or inflated, to a pressure of 10 to 12 mm Hg using an automatic carbon dioxide insufflator.

Observation and Findings

• The laparoscopic examination provided an excellent view of several abdominal structures. These included the umbilical structures, the bladder, the genital tract, the inguinal area (the area near the groin), the liver, and some segments of the intestinal tract.
• The examination was unable to identify two parts of the intestinal tract – the duodenum (the first section of the small intestine) and the ileum (the third and longest section of the small intestine).
• In some foals, an embryonic vestige or remnant of the yolk stalk (known as the ductus pedunculi vitellini) was identified. This was seen in six out of eleven foals.
• In four of these foals, the yolk stalk remnant appeared as a fibrous band extending from the umbilicus (the belly button) to the cranial abdominal cavity, where it inserted on the small intestine.
• In the remaining two foals, only the fibrous umbilical portion of the band was observed.

Implications

• The study provides valuable information on the abdominal anatomy of foals, which can be useful in veterinary medicine, particularly for surgeries on young horses.
• Moreover, it demonstrates the effectiveness of laparoscopy as a method for examining the internal structures of foals, highlighting its potential for both diagnostic and therapeutic purposes.