Table of Contents
What is the name of the 4 bumps that can be seen if you pull away the cerebellum?
The lobes of the brain are visible, as well as the transverse fissure, which separates the cerebrum from the cerebellum. The convolutions of the brain are also visible as bumps (gyri) and grooves (sulci).
What is gray matter and white matter?
Overview. The tissue called “gray matter” in the brain and spinal cord is also known as substantia grisea, and is made up of cell bodies. “White matter”, or substantia alba, is composed of nerve fibers.
What part of the sheep brain looks like cauliflower?
Sheep Brain Dissection Analysis:
| a | looks like a butt | Arbor Vitae |
|---|---|---|
| c | cauliflower, the area toward the back of the brain | Optic Chiasma |
| d | behind the colliculi, looks like a little nub | Superior Colliculi |
| e | looks like a “tree” | Dura Mater |
| f | the rounded part of the brain stem | Cerebellum |
How are sheep and human brains similar?
The sheep brain is similar to the human brain in that they both have two brain stems, two optic nerves and two hemispheres; but they differ in size and in functions.
Why is the olfactory bulbs larger in sheep?
The olfactory bulb is larger in a sheep brain than in the human brain. This larger olfactory bulb allows the sheep to have a stronger sense of smell which is vital to its survival. Based on their relative sizes, which of the cranial nerves seems to be the most developed in sheep?
What is the myelin?
Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells.
Why does grey matter decrease with age?
Gray matter volume decline after middle age (about 40 years), however, is thought to primarily reflect degenerative changes in the gray matter (Sowell et al., 2003), due to shrinkage or loss of neurons (Terry et al., 1987) and loss of dendritic arborization (Jacobs et al., 1997).
What is the difference between grey and white matter in a sheep brain?
The appearance of white matter is due to the myelin sheath found on the axons of some neurons. In contrast, cell bodies have no myelin sheath and as a result they look grey in color.
Is the pons GREY or white matter?
The gray matter of pons can be homologous to the spinal cord, such as cranial nerve nuclei, or the gray matter of its own. Pontine gray matter includes pontine nuclei, the gray matter of reticular formation, the superior olivary nucleus, trapezoid body nucleus, and nucleus of the lateral lemniscus.
How do the sizes of the olfactory bulbs of the sheep brain compare with those of the human brain?
One major difference between sheep and human brains has to do with the sense of smell. 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.
What is the difference between a sheep brain and human brain?
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.
What is sheep brain called?
cerebrum
Just like you and many other mammals, sheep have a part of the brain called the cerebrum. It is important for controlling movement, the senses, and thinking.
What happens to a sheep’s brain during a dissection?
Sheep Brain Dissection 1. The sheep brain is enclosed in a tough outer covering called the dura mater. You can still see some structures on the brain before you remove the dura mater. Take special note of the pituitary gland and the optic chiasma. These two structures will likely be pulled off when you remove the dura mater.
What tools do I need to perform a sheep brain dissection?
You will need the following dissection tools to properly perform this lab: scalpel scissors 2 probes (1 for each lab participant) 3. The sheep brain is enclosed in a tough outer covering called the dura mater. You can still see some structures on the brain before you remove the dura mater.
What happens if you remove the dura mater from a sheep’s brain?
1. The sheep brain is enclosed in a tough outer covering called the dura mater. You can still see some structures on the brain before you remove the dura mater. Take special note of the pituitary gland and the optic chiasma. These two structures will likely be pulled off when you remove the dura mater.
What does a sheep’s brain look like?
The sheep brain is enclosed in a tough outer covering called the dura mater. You can still see some structures on the brain before you remove the dura mater. Take special note of the pituitary gland and the optic chiasma.