Brain Structures (SNAB)

  • Created by: Jenny1809
  • Created on: 17-06-17 10:33

Cerebral Hemispheres

Left & right cerebral hemispheres, each composed of 4 main lobes: parietal, frontal, temporal & occipital

Inside & corpus callosum = white matter; outside = grey matter

Grey Matter = Cortex

  • Composed of mainly cell bodies, synapses & dendrites
  • Highly folded - roughly 2/3 of brain's mass

White Matter

  • Myelin sheath - gives white colour
  • Nerve axons - connect neurones in different parts of the brain
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The 4 Lobes - Frontal & Parietal

Frontal Lobe

  • Higher brain functions (e.g. decision making, emotions)
  • Forming associations & ideas
  • Includes primary motor cortex - neurones connect directly to spinal cord/brain stem & then to muscles; stores information on how to carry out movements

Parietal Lobe

  • Orienation & movement
  • Sensation 
  • Calculation 
  • Some types of recognition & memory
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The 4 Lobes - Occipital & Temporal

Occipital (Visual Cortex)

  • Processes information from the eye
    • Vision, shape recognition & perspective

Temporal Lobe

  • Processes auditory informationMemory
    • Hearing, sound recognition & speech (left temporal lobe)
  • Memory
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Hypothalamus

Lies below thalamus

Hypothalamus & Hormones

  • Acts as endocrine gland, secreting hormores
  • DIrectly connected to pituitary gland, which secretes other hormones

Contains thermoregulatory, sleep, thirst & hunger centres

Thermoregulatory Centre (Topic 7.4)

  • Monitors core body & skin temperature
  • Initiates corrective action to restore optimum (negative feedback)
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Cerebellum

Responsible for balance

Coordinates moevement as carried out, recieving information from primary motor cortex (frontal lobe), muscles & joints

Constantly checks if motor programme being used is correct

  • Refers to incoming information about movement & external circumstances
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Medulla Oblongata

Regulates body processes not under conscious control

Ventilation Centre

  • Impulses sent from chemorecpetors & stretch receptors
    • Detect changes in pH, CO2 levels (etc.) in blood
  • Ventilation sends impulse back to stimulate muscles involved

Cardiovascular Control Centre (CCC)

  • Controls heart rate
  • Automonic nervous system = nerves from CCC to heart
  • Detects CO2, lactate, O2 & temperature levels of blood
  • Impusles sent to CCC from sensory receptors in muscls
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