Sheep Brain Dissection External Brain Cerebrum most superior

Sheep Brain Dissection External Brain Cerebrum- most superior part of brain Cerebellum- “little brain” produces smoothly coordinated muscle activity. Frontal lobe- reason, plan, use language, and solve problems Temporal lobe- hearing and memory Occipital lobe- controls vision Parietal lobe- pain, touch, and temperature

Gyri- elevated ridges of tissue Sulci- shallow grooves Ventral median sulcus- sulcus on ventral side of the brain Longitudinal fissure- deep sulcus that divides the left and right cerebral hemispheres Olfactory bulbs- perception of odors Optic tracts- visual system

Optic nerves- transmits visual information from the retina to the brain. Optic chiasma- crossover of the fibers of the optic nerves. Mammillary body- sense of smell Hypothalamus – regulation of body temperature, water balance, and metabolism Oculomotor nerves-controls eye movement, constriction of pupil, open eyelid Cerebral peduncles- convey ascending and descending impulses

Pons- fiber tracts, important nuclei involved in breathing Medulla oblongata- fiber tracts, nuclei that regulate vital visceral organs, heart rate, blood pressure, breathing, swallowing, vomiting Superior Colliculi- external layers- receive input from the eyes and sensory organs-- Internal layers- activating eye movement, motor related

Internal Brain Pineal gland- endocrine gland – produces melatonin, modulation of sleep/wake patterns Arbor vitae of the cerebellum-brings sensory and motor information to and from the cerebellum. Third ventricle- contain cerebrospinal fluid, protection of brain from trauma Lateral ventricle- contain cerebrospinal fluid, protection of brain from trauma Corpus callosum- connects cerebral hemispheres

Hypothalamus- regulation of body temperature, water balance, and metabolism Thalamus- relay station for sensory impulses passing to the sensory cortex