Topic C - Nervous system, neurological diseases and the eye part 1 Flashcards
What are the major organs and structures in nervous system?
Brain, spinal cord, nerves
What are the accessory structure in nervous system?
Meninges, sympathetic chain of ganglia
what are the 2 main functions of nervous system?
- Transmit electrical signals
* Allows brain communicate with the body
Which 2 organs make up central nervous system (CNS)
- Brain
2. Spinal cord
what makes up the peripheral nervous system (PNS)
Consists mainly of the nerves that extends from the brain and spinal cord
-Cranial nerves (from the brain)
-Spinal nerves (from the spinal
cord)
name the 12 pairs of cranial nerves and their function
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- Olfactory nerve = for smell (s)
- Optic nerve = For vision (s)
- Oculomotor nerve = For eye movement (m)
- Trochlear nerve = For eye movement (m)
- Trigeminal nerve = Motor for chewing, sensation of facial skin and mucosa of nose and mouth (s/m)
- Abducens nerve = For eye movement (m)
- Accessory nerve = For eye movement (m)
- Vestibulocochlear nerve = For balanc e and hearing (s)
- Vagus nerve =sympathetic and parasympathetic functions (s/m)
- Glossopharyngeal nerve = For swallowing and saliva production (s/m)
- Facial nerve = Motor for facial expression, sensory for taste (s/m)
- Hypoglossal nerve = For tongue movement (m)
describe spinal nerves
- Stem out from the spinal cord
2. Include nerve fibres of the sensory (going into cns) and motor neurons (going out of cns)
what are the 3 types of neurons?
- Sensory (afferent) neurons - carry signals from the outer parts of your body (periphery) into the CNS. Can be Bipolar neurons – one dendrite and one axon (found in the eye) OR Unipolar neurons – one dendrite, one axon with cell body push off to the side. Many cell body will grouped to form ganglia
- Motor (efferent) neurons - carry signals from the CNS to the outer parts (muscles, skin, glands) of your body. Multipolarneurons – multiple dendrites and an axon
- Interneurons - connect various neurons within the brain and spinal cord.
what are the 4 main area of the brain?
- Cerebral hemispheres (cerebrum)
- Diencephalon
- Brain stem
- Cerebellum
what is the cerebrum, what id its function and what are the 4 lobes within it?
It is the largest part of the brain and is composed of right and left hemispheres.
function: It performs higher functions like interpreting touch, vision and hearing, as well as speech, reasoning, emotions, learning, and fine control of movement.
Four lobes:
- Frontal lobe
- Temporal lobe
- Parietal lobe
- Occipital lobe
what are the functions of the frontal lobe, temporal lobe, parietal lobe and occipital lobe
Frontal Lobe (motor)
• Sends impulses to skeletal muscles
Imp: in movement, etc
Parietal lobe (sensory)
• Receives impulses from the body’s sensory receptors
Imp: in calculation, reading/writing, etc
• Temporal lobe (hearing)
for hearing
• Occipital lobe (visual)
the visual processing center of mammalian brain containing most of the anatomical region of the visual cortex
describe the grey and white matter of the cerebrum
Cerebral cortex (Gray matter) – superficial layer Contain cell body & dendrites of neurons and unmyelinated axons (causes grey colour)
White matter – deeper layer
Composed of myelinated axons carrying impulses to, from, or within the cortex
Contains islands of gray matter known as basal nuclei e.g. caudate nucleus, putamen, globus pallidus
where is the diencephalon? what does it consist of?
Sits on top of the brain stem
Enclosed by cerebral hemispheres
Consists of the:
• Thalamus
• Hypothalamus
• Epithalamus
what is hypothalamus and what are its 3 functions?
An important autonomic nervous system centre
• Regulate body temperature, water balance and metabolism
• Centre for drives and emotions e.g. thirst, appetite, sex, pain, pleasure
• Regulate the release of hormones by pituitary gland
If Tumour is found in pituitary gland,
- Cause hemianopia
Visual field loss
what does the brain stem consist of and what are their functions?
1,Midbrain Convey ascending (sensory) and descending (motor) impulses. Contains reflex centres involved in vision and hearing
2.Pons
Mostly made up of fibre tracts. Contains important nuclei involved in the control of breathing
3.Medulla oblongata
An important fibre tract area Contain centres that control heart rate, blood pressure, breathing, swallowing, vomiting etc