The glottis is the opening between the oral cavity and the trachea. The epiglottis is the flapthat covers the glottis. You will see a flap pointed dorsally this is theepiglottis. Push down on the tongue to open the jaws. The pharynx is a passageway for what two substances? The Pharynx is dorsal to the oral cavity and has three openings: the glottis, the esophagus and the trachea. Observation of the Pharynx of the Fetal Pig In humans what structure hangs from the soft palate? V Soft Palate - smooth region posteriorto the hard palate.

Prendergast, Valerie (Attendance Secretary).

Pennington, Clare (Vice Principal's Secretary).

Lucia-Hayden, Lisa (Principal's Secretary).The appendix in humans is the evolutionary remains of a larger cecum in human ancestors.

The cecum is large in herbivores but much of it has been lost during evolution in humans. It houses bacteria used to digest plant materials such as cellulose. The cecum is a blind pouch where the small intestine joins the large intestine. The spleen is an elongate, flattened, brownish organ that extends along the posterior part of the stomach ventral to (above) the pancreas. Lift the stomach and identify this light-colored organ. It extends along the length of the stomach from the left side of the body (your right) to the point where the stomach joins the small intestine. The pancreas is located dorsal and posterior to the stomach. Find the bile duct that leads to the small intestine. This structure stores bile produced by the liver. Lift the right lobe and find the gallbladder. Locate the cecum, a blind pouch where the small intestine joins the large intestine. Find the posterior part of the large intestine called the rectum and observe that it leads to the anus. Identify the small intestine and large intestine. Using a probe, trace follow the esophagus to the stomach. You have already seen how the esophagus leads from the pharynx through the neck region. The word “urogenital” refers to an opening that serves both the urinary (excretory) and the reproductive systems.įigure 20. Esophagus, larynx, trachea, bronchus, and lung. Use your pig and also a pig of the opposite sex to identify the structures in the photographs below. Obtain a fetal pig and identify the structures listed in figure 1. Use figures 1–4 below to identify its sex. The pig in figure 1 below has its ventral side up. The pig in figure 1 is lying on its dorsal side. If a structure is anterior to another, then it is closer to the head. The following words will be used to help identify the location of structures. Links to high-resolution, unlabeled photographs are also provided for many of the photographs. As a result, a structure shown in one photograph may look different than the same structure shown in another photograph.Ĭlick on any of the photographs to view enlargements. Several different pig dissections were used to obtain the photographs below. The incision can be seen in the first photograph below. An incision was made on the side of the neck to enable the injections. The arteries have been filled with red latex and the veins with blue.

The fetal pig that you will dissect has been injected with a colored latex (rubber) compound.

Pig dissection diagrams