L.10 Nerves and vessels - 2 Flashcards
General arrangement of tissues
[heft]
Superficial vessels and nerves
-Cutaneous vessels and nerves from networks under the skin
Deep vessels and nerves
Under deep fascia, nerves and vessels collect in bundles.
Neurovascular bundle = bundle of nerves and vessels, enclosed in fascial sheath
Nervous system
Central NS
Periferal NS
- transport electrical signals
Central NS
Brain and Spinal cord
- Responsible for making sense of stimulation/ sensory input created by internal and external environments from PNS
- Responsible for initiating responses/ motor outputs
Peripheral NS
Cranial and spinal nerves
- Responsible for collecting anf transporting sensory input from the internal/ external environment to the CNS. Then transport a motor output from CNS to the body to make it respond/ interact with environment.
Spinal cord and spinal nerves relationship
- Neurons transmit electrical signals and gather in plexus’
- So if 1 neuron is damaged, another can take over
- There are 4 Plexus’ to ensure injury does not denerve an area completely
Structure of neuron
[heft]
Cell body, myelin sheath, node of ranvier, dendrites
Relationship of spine and spinal cord
Spine = Vertebral column
- Spinal cord runs inside vertebral column for protection
[heft]
Cranial nerves - head
- Brain itself has no sensory input, only processes info
Trigeminal nerve
Optic nerve
Nerves of the Peripheral NS
Spinal Nerves Thorax
Spinal nerves upper limb
Spinal nerves lower limb
Nerves in the Spinal Nerves Thorax
Intercostal nerves (between ribs)
Vagus nerves (cranial nerve to oesphagus, parasympathetic)
Phrenic nerves (Controls diaphragm)
Sympathetic trunk (Sympathetic NS)
Spinal Nerves in the upper limb
Radial nerve (Runs along radial artery)
Ulnar nerve (Runs along funny bone)
Spinal nerves in the lower limb
Femoral nerve (Pelvis to front of ankle)
Sciatic nerve (Under glutes under deep fascia, down hamstring)
Common fibular nerve ( Posterior on knee, then wraps down anterior)
