EXTERNAL FEATURES The body is composed of head, neck, trunk, and tail.

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Presentation transcript:

EXTERNAL FEATURES The body is composed of head, neck, trunk, and tail. The trunk is divided into two parts: - Thorax and the abdomen

EXTERNAL FEATURES On the head there are: fleshy, external ears called pinnae eyes with the upper and lower eyelids snout with external nares (nostrils) tongue edged with papillae

EXTERNAL FEATURES The snout is cartilaginous and contains the nares for the passage of air. The end of the snout is strengthened by a bony region to allow the pig to dig into the soil in search for food. The snout also serves to house many olfactory receptors that give the pig an efficient sense of smell.

EXTERNAL FEATURES Appendages: The pig is an ungulate in which the weight of the body is borne on the tips of the digits (toes) which are in the form of a hoof. The first digit of both forelimbs and hindlimbs is absent and the second and the fifth digits are reduced in size. The only fully functional digits are the third and fourth.

EXTERNAL FEATURES Forelimb Appendages: wrist lies superior to the hoof (digits) elbow is a bony protuberance on the posterior side of the leg shoulder is superior to the elbow

EXTERNAL FEATURES Hindlimb Appendages: ankle is a bony protuberance on the posterior side of the leg knee is on the anterior side of the leg superior to the ankle dorsal to the knee is the hip, a bony mass close to the middorsal line

EXTERNAL FEATURES Umbilical Cord: The cut umbilical cord is on the ventral portion of the abdomen. During fetal life, the cord with its contained blood vessels connects the fetus to the placenta on the uterine wall of the female.

EXTERNAL FEATURES Umbilical Cord: Highly oxygenated blood is transferred to the fetus through the umbilical vein. Partially oxygenated blood is removed from the fetus through the umbilical arteries. Metabolic wastes are removed through the allantoic duct which is connected to the fetus’ allantoic bladder.

EXTERNAL FEATURES Locate the external features of your fetal pig. Record your observations in your dissection journal. With your scissors, cut off a small portion of the umbilical cord to locate and identify the key structures.