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BLG 101 12 & 13 Exam questions with answers
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BLG 101 12 & 13 Exam
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BLG 101 (lec 12 & 13)Adult brains have 4 regions: - answer1. Cerebral hemispheres
2. Diencephalon
3. Brain stem
- midbrain
- pons
- medulla
4. Cerebellum
Gray matter - answerShort, nonmyelinated neurons and cell bodies (outside layer of
brain)
- enters or exits
White matter - answerMyelinated and nonmyelinated axons
- carries to or from
Sensory - answerInfo coming from body
Motor - answerBrain to muscle
Ventricles - answerFluid filled chambers that are continuous to one anther and to central
canal of spinal cord
1. Filled with cerebrospinal fluid
- flush our neurotransmitters (aids with infections & neurotranmitter metabolism)
2. Lined by Ependymal cells (neuroglial cells)
Cerebral hemisphere - answerCreates lots of surface area
Gyri: ridges
Sulci: shallow grooves
Fissures: deep grooves
- longitudinal tissues (separates 2 hemispheres)
- transverse cerebral fissure (separates cerebrum and cerebellum)
5 lobes - answer- frontal
- parietal
, - temporal
- occipital
- insula
Major sulci that divide lobes - answer- central sulcus separates pre central gurus of
frontal lobe and post central gurus of parietal lobe
- parietal- occipital sulcus separates occipital and parietal lobes
- lateral sulcus outline temporal lobes
Each hemisphere has 3 basic regions - answer- cerebral cortex of grey matter
superficially
- white matter internally
- basal nuclei deep within white matter
Cerebral cortex - answerSite of conscious mind: awareness, sensory perception,
voluntary motor initiation, communication, memory storage, understating
3 functional areas of cerebral cortex - answer- motor areas: control voluntary movement
- sensory areas: conscious awareness of sensation
- association areas: integrate diverse information (engage w/ other areas)
Motor areas (LEFT) - answer- primary motor cortex
- premotor cortex
- frontal eye field
- boras area
Located in per central gurus of frontal lobe
- lots of motor units in face
- not much in legs
Sensory areas (RIGHT) - answer- somatic sensation
- taste
- equilibrium
- vision
- hearing
Located in post central gyrus
- lots of sensory neurons in hands
Cerebral cortex (primary motor cortex) - answer- premotor cortex (helps plan
movements, learning)
- Broca's area (speech production)
- Frontal eye field (eye movements)
- sensory areas
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