Question

Sheep Brain Dissections

1 Why are the olfactory tracts not called olfactory nerves?

2 How does the human mammillary body look different from the sheep?

3 How do the three parts of the sheep brain stem compare to the human brain stem?

4 Does the arbor vitae in the cerebellum of the sheep brain look similar or different from the arbor vitae of the human brain?

Answer 1

1. In sheep, the brain's olfactory bulb is two or three times the size of the human olfactory bulb. It provides the sheep with a strong sense of smell which is key for survival. A mother can use her sense of smell to find her baby in a flock. A baby can smell its way back to its mother if it gets lost

2.A sheep's brain is elongated in shape, whereas a human brain is rounded. The human brain stem is towards the backbone and downwards, because in the human body the backbone is vertical; compared to a sheep's backbone which is horizontal, and its brain is directed outwards

There are a few differences between the human and sheep brain. The human brain is larger in size and shape when compared to the sheep’s brain. Sheep brains do not have as many ridges and contours (convolutions) when compared to human brains, that have a considerable number of ridges and contours to give them an apparently much larger area than the sheep’s brain. However, there are several differences in human and sheep brains, but almost all mammals brains are similar.
The human brain of an adult weighs about 1,300 to 1,400 grams, and in length is almost 15 cm long. A sheep’s brain is elongated in shape, whereas a human brain is rounded. The human brain stem is towards the backbone and downwards, because in the human body the backbone is vertical; compared to a sheep’s backbone which is horizontal, and its brain is directed outwards. The human brain is not only larger, but heavier than a sheep’s brain, because it is only 140 grams compared to the human brain, and is only about one third as long.
The convolutions and sulci comprises of a larger surface area than sheep apparently have, since they have less ridges and contours. Human behavior and motor control is typically controlled by the cerebellum, and a sheep’s brain has a much smaller cerebellum than the human brain, which, in comparison with humans and their complex learned behaviors, have less motor control and less learning abilities. The olfactory bulb, on the contrary, is comparatively larger in the sheep’s brain when compared to the human brain, because animals usually rely more upon their senses and abilities of smell than humans do. Humans rely more upon other senses, such as sight and hearing, rather than smell like sheep and other animals.
The pineal gland is responsible for controlling reproduction and circadian rhythms, and they happen to be larger in the sheep’s brain when compared to the human brain, that has less basic instinctual behavior controls. There is also a difference in the positioning of the human hind brain, which is different from the sheep because of the human’s erect position.
The human brain is not only an amazing organ, but it allows inventing, creating, and imagining, which is a major difference between human and other animal brains, such as the large prefrontal cortex region. This is the area behind the forehead that sets the human brain apart from the animal brain – which is not capable of all these inventive and creative processes. The skull protects the human brain, and the skull is about a quarter of an inch thick to protect the human brain from injuries. The human brain, when compared to the sheep’s brain, has a much larger frontal lobe.
Summary:
1. The human brain is heavier and longer than a sheep’s brain.
2. The sheep’s brain has a more developed olfactory bulb when compared to the human brain.
3. The human brain is rounded, whereas the sheep’s brain is elongated in shape.
4. The human brain has a larger frontal lobe than the sheep’s brain.
5. The human brain and sheep brain have the major difference that humans can think, write, invent or create with their brains, whereas sheep cannot

3.A sheep's brain is elongated in shape, whereas a human brain is rounded. The human brain stem is towards the backbone and downwards, because in the human body the backbone is vertical; compared to a sheep's backbone which is horizontal, and its brain is directed outwards.

4.The human's olfactory bulb is bigger than the sheep. Humans can smell much better than sheep. ... The stem on the sheep is longer in comparison to the human, while the cerebellum is wider in the human compared to the sheep. The cerebellum is more protected in the human brain than the sheep brain.