Hind Brain Also Called Reptilian Brain Surrounds the Fourth Ventricle Has

Psyc 372 – Physiological Psychology Psyc 372 – Physiological Psychology

Hind Brain Medulla

Also called Reptilian Brain • Also contains part of the reticular formation. Surrounds the fourth ventricle • Regulates breathing, heart rate, Has two major divisions with 3 structures digestion, blood pressure, temperature, skeletal muscle tone, and other things. Metencephalon • Is the structure that keeps you alive. Pons and Cerebellum You can damage other parts of the Myencephalon brain and live, if you damage the Medulla Oblongata (Medulla) medulla, you usually will die.

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Psyc 372 – Physiological Psychology Psyc 372 – Physiological Psychology Cerebellum Pons Also Called the “Little Brain”

• Is superior (above) to the medulla. • Appears similar to the cortex • Is ventral to the cerebellum. • Is located behind the Medulla and Pons • Also contains a portion of the RAS. • Is connected to the Pons by three • Is responsible for wakefulness or the bundles of axons called the Cerebellar sleep cycle. Peduncles. •Superior • Middle •Inferior

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Psyc 372 – Physiological Psychology Psyc 372 – Physiological Psychology

Cerebellum Continued Function

• Has two hemispheres • Helps control muscle tone, body balance. • Is covered by a cerebellar cortex. • Also smoothes o ut muscle movement so it is • Has a set of deep cerebellar nuclei not jerky. • Receives information from the cerebellar cortex • Sends information to the cerebellum and to • In general, it helps coordinate voluntary other brain structures. muscle movement. • Receives information from the: • Is extremely important for controlling rapid • Visual movement such as startle responses. •Auditory •Vestibular • Also helps mainta in bo dy balance. •Somatosensory • Has a memory system which helps with motor • Motor system. control. • Works with many other systems involved with • Think of throwing a baseball or hitting a tennis movement. 5 ball. 6

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Damage

• Results in jerky, exaggerated, motor movements. • Movements are also poorly coordinated.