Answer :
The urinary bladder of a fetal pig is sac like, muscular and expandable walls with a thickness of 10mm and a firm texture.
What is a fetal pig?
Fetal pigs are unborn pigs used in elementary and advanced biology classes for learning through dissection. They are extracted from diseased sows killed in meat industries. They are used in the study of mammalian anatomy.
These pigs are usually 10-15mm and 20-30 days of age and their highest is 50-70mm in length and 60-70 days old. The urinary bladder has a firm texture and a thickness of about 10mm and also they walls are muscular lining and a sac like shape.
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The urinary bladder wall in the fetal pig consists of a transitional epithelium that changes thickness depending on the bladder's fullness, a lamina propria with connective tissue, a submucosa connecting to the detrusor muscle, and an outer peritoneum layer. It is highly distensible with a smooth inner surface to facilitate urine storage and passage.
The innermost layer is the transitional epithelium, which is specially adapted to accommodate the fluctuating volumes of urine. This epithelium can change in thickness; when the bladder is empty, it resembles columnar epithelia, and when filled, it becomes more squamous in appearance. Just beneath the transitional epithelium is the lamina propria, consisting of a loose connective tissue that houses nerves and blood and lymphatic vessels. The submucosa layer follows, helping to connect the epithelium to the detrusor muscle, which makes up the bulk of the bladder wall with its crisscrossing smooth muscle bands. The outermost layer is the peritoneum, a smooth epithelial layer that lines the abdominal cavity. Regarding texture, the bladder's wall is highly distensible, allowing it to expand and contract as necessary. The inner surface of the bladder is smooth to allow urine to pass easily without getting trapped. Transitioning cellular epithelium allows the bladder to efficiently handle large volume changes, characteristic of this organ's primary function in the urinary system.
