Sheep Brain Dissection

By: Ryan Begun and Nick Palladino and

Mr. Davis

The Dura Mater

• The dura mater is a thick durable membrane covering the brain and closest to the skull.

• Surrounds and supports the large venous channels carrying blood from the brain toward the heart.

Pia Mater

• Thin white coating on the brain surface

• Contains blood vessels that supply blood to the brain.

The Cerebrum

• The largest part of the human brain.

• Associated with higher brain functions such as thought and action.

• Cerebrum is divided into five lobes.

• Frontal, Parietal, Occipital, Temporal, and insula.

The Cerebellum

• Also known as the “little brain”

• Associated with regulation and coordination of movement, posture, and balance. Involuntary Control

The Brain Stem

• Responsible for vital life functions such as breathing, heartbeat and blood pressure.

• The brain stem is made of the midbrain, pons, and medulla oblongata.

Medulla Oblongata• Controls autonomic

functions, such as heart rate, respiratory rate, coughing, vomiting etc.

• Relays nerve signals between the brain and spinal cord

The pons

• Involved in the motor control and sensory analysis.

Midbrain

• Relay station for auditory and visual information

• Eye movement

Frontal Lobe• Involved in our motor

functions.• Problem solving• Memory• Language• Judgment• Impulse control• Houses our

personality

Temporal Lobe

• Associated with perception and recognition of the auditory stimuli, memory, and speech.

Occipital Lobe

• Associated with visual processing

• Helps interprets what the eyes see

Parietal Lobe• Associated with

movement• Orientation• Recognition• Perception of the

stimuli to the body• Sense of Touch• Primary

Somatosensory Cortex

Gyri and Sulci

• Gyri is the bumps, elevated ridges in the cerebral cortex as shown by the circles.

• Sulci: the indentations, shallow grooves, as shown by the solid lines

Gyrus Sulcus

Pre central gyrus

• Located in front of the central sulcus. First Gyrus in the frontal lobe.

• Voluntary movement of skeletal muscles

Post central gyrus

• In parietal lobe first gyrus behind the central sulcus.

• Receives sensory feed back from all over the body; including

• From joints• And tendons• Internal Organs

Central Sulcus

• Groove, separates frontal and parietal lobes.

Longitudinal Cerebral Fissure

• Separates the two sides of the cerebrum

Diencephalon

• Thalamus• Hypothalamus

Thalamus

• Processes and relays movement and sensory information

Hypothalamus

• Controlling hunger and thirst

• Emotions• Body Temperature

regulation• Circadian rhythms• Other Homeostatic

Controls. Read in your book about this little but important part of the brain.

Corpus Callosum

• Communication between the left and right hemispheres

• Forms roof of lateral and third ventricles

• Myelinated White Matter

White Matter

• Area where messages pass through

• Develops throughout life.

• Myelinated

Grey Matter

• Muscle Control• Sensory Perception• Seeing• Hearing• Memory• Speech• Emotions

• UNMYELINATED