Week 9: peripheral nerve supply Flashcards
(28 cards)
Nervous system functions
- Control centre and communication network
- Senses, interprets and responds to changes
Sensory neurons
transmit information about conditions in and out of the body
Motor neurons
transmit information that controls the activity of muscle and glands
Glial/support cells
provide protection and nutrition
Central nervous system (CNS)
- Brain and co-located structures
- Spinal cord
- All protected by bones of the axial skeletons
Where do cranial nerves emergy
brain
brainstem
Cranial nerves supply
- Supply the musculoskeletal structures of the head and neck
- Supply the viscera of the thorax and abdomen
Spinal nerves emergy from
spinal cord
Spinal nerves supply what
Supply the structures of the trunk wall and the limbs
How many pairs of cranial and spinal nerves
12 cranial 31 spinal
Dorsal ramus
distributed to the back muscles and skin
Ventral ramus
distributed to anterior, lateral trunk muscles & skin
Ventral rami
distributed into the limbs to supply the muscles and skin
Sensory distribution
- To skin: sensation
(e.g. hot, cold, pain, touch, pressure) - To joints: sensation of joint position (proprioception)
Motor distribution
- To muscles: turns the muscle on & makes it contract (concentric, isometric or eccentric)
- To glands: increases secretion from gland (usually): supply to sweat glands produces
L2 movement
hip flexion
L3 movement
hip flexion
knee extension
L4 movement
hip extension
knee extension
ankle dorsiflexion
L5 movement
hip extension
knee flexion
ankle dorsiflexion
toe extension
S1 movement
knee flexion
ankle plantarflexion
toe flexion
toe extension
S2 movement
ankle plantarflexion
toe flexion
L1 skin
inferior to inguinal ligament
ASIS to groin
L2 skin
anterior thigh
greater troch to middle inner thigh
L3 skin
anterior thigh
middle lat thigh to medial knee joint
