Theme 1 - nerves Flashcards
Function of lymphatic system
Transport Fat
Antibiotic manufacture
Drainage
What are the lymphatic drainage mechanisms?
Negative thoracic pressure, vessel contraction , valves & muscle pumps
What is the clinical importance of the lymphatic system
Drainage patterns are consistent, so they are predictive of infection spread - can be predictive of tumour spread
Functions of the nervous system
Receiving sensory input
Initiating action & regulating behaviour in response to an external stimuli
Maintaining homeostasis
Anatomical divisions of the nervous system are?
Central NS: Brain & Spinal cord
Peripheral NS: Peripheral nerves & ganglia
peripheral nerves
Bundles of myelinated axons - Connects your central nervous system to other parts of the body
Anatomical divisions of the PNS
Somatic nervous system- neurones that supply the skin, skeletal muscle, bones and joints
Autonomic nervous system- neurones that supply glands visceral, smooth muscle, cardiac muscle
What do the spinal nerves exit through?
intervertebral foramina
What is the role of the Somatic Nervous System?
Controls voluntary & reflex activities
- Connects CNS to body wall, skin, skeletal muscle and joins
- Regulates responses to external stimuli
- Simplest form of regulation is through reflexes
What is the role of the Autonomic nervous system?
& its two divisions?
Controls glands, smooth muscle & cardiax muscle
Two divisions:
Parasympathetic NS: brain & spinal cord (motor neurons) - rests
Sympathetic NS: Thoracic & Lumbar spinal cord - arouses
What are the functions of the ANS?
- Connects CNS to glands, smooth and cardiac muscles
- Regulates responses to internal stimuli
- Functions to maintain homeostasis
(Mostly under reflex control)
What type of outflow does the SNS have?
Thoracolumbar outflow : Preganglionic axons leave spinal cord between T1 & L3 - the thoracic (thora) & lumbar (lumbar) spinal cord
What type of outflow does PSNS have?
Craniosacral outflow: Preganglionic acons leave brain (cranio) & spinal cord (sacral)
Why are SNS preganglionic axons shorter than PSNS? & What does this mean about its Postganglionic axons?
Very short as the ganglia are very close to the spinal cord in the chain and so its postganglionic axons are longer
