6_Brain_Brainstem,_Cranial_Nerves,_Cerebellum_Koeberle

6_Brain_Brainstem,_Cranial_Nerves,_Cerebellum_Koeberle -...

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Brainstem The Brainstem consists of: -the midbrain (top) -the pons -the medulla (bottom) - location of Cranial Nerve Nuclei - receives sensory from head and neck - motor nuclei for head and neck - nuclei for autonomic functions
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Brainstem- Medial Section Pons Medulla Midbrain Cerebellum Thalamus Hypothalamus Fourth Ventricle Cerebral Aquaduct - Connects 3 rd ventricle to the 4 th ventricle
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Cerebral Peduncles Inferior View- Brainstem - Descending motor fibers Pons Pyramids - Descending motor fibers Cerebellum Decussation of Pyramids - the point at which the descending motor fibers cross over to the contralateral (opposite) side of the body Medulla Midbrain
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Pineal Gland - Circadian Rhythms - “Pine-cone like” Thalamus Cerebellum Sup. Colliculus Visual Reflexes Inf. Colliculus Auditory Reflexes Midbrain Brainstem- Posterior View Pons Medulla Spinal Cord Fourth Ventricle - opened from behind
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The Third Eye- Parietal Eye - well developed in lizards - contains photoreceptors that monitor the spectrum of light during the day, telling the lizard what time it is… - parietal eye sends signals to the Pineal gland to control circadian rhythms such as body temperature - The photosensitive eye is missing in humans , however the Pineal gland still functions - Pineal secretes Melatonin - Melatonin causes drowsiness and reduces body temperature - it is produced at night , helping you sleep
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Cerebellar Peduncles - Cerebellar input and output fiber bundles Fourth Ventricle - opened from behind Lateral Geniculate Nucleus - Vision relay (Thalamus) Medial Geniculate Nucleus - Auditory relay (Thalamus) Right Thalamus Superior Colliculus - Visual Reflexes Inferior Colliculus - Auditory Reflexes Brainstem- Posterior View (Off to the Right) Left Thalamus Cerebral Peduncles - Descending motor fibers
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Midbrain - Below the Diencephalon Major Structures: Superior Colliculus- visual relay center - reflex eye and head movements towards “things that catch your visual attention” Inferior Colliculus- auditory relay center - reflex head movements towards auditory stimuli Substantia Nigra and Subthalamic Nucleus- part of basal ganglia (motor movement)
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This note was uploaded on 09/25/2009 for the course ANATOMY ana300y1 taught by Professor Wiley during the Winter '09 term at University of Toronto- Toronto.

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6_Brain_Brainstem,_Cranial_Nerves,_Cerebellum_Koeberle -...

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