The Laminaes Flashcards
What is the function of lamina 1
- responds to noxious and thermal stimuli
- sends info to brain through contralateral spinothalamic tract
What is the function of lamina 2
Sensation of noxious and non-noxious stimuli
Modulation of sensory input to contribute to the brain’s interpretation of incoming signals as painful or not.
Sends info to lamina 3 and 4
Corresponds to substantia gelatinosa
What is the function of lamina 3
- proprioception and light touch
- connects with cells in layers IV, V and VI
- partially corresponds to nucleus proprius
- these neurons bifurcate several times to form a dense plexus with the function of being a connector from propriospinal / interneuron cells
What are the functions of lamina 4 ?
Non noxious sensory information relay and processing. Cells connect to lamina 2and respond to light touch. Partially corresponds to nucleus proprius.
What are the functions of lamina 5
Lamina 5 receives nociceptive information from the visceral organs and therefor has clinical relevance for referred pain.
What are the functions of lamina 6 ?
Many cells are interneurons participating in spinal reflexes.
Receives sensory information from muscle spindles and is there fore involved in proprioception.
What are the functions of lamina 7
Also know as zona intermedia
Receives info from lamina 2 and 6 as well as visceral afferent fibers
Relays motor information to viscera
Gives rise to cells involved in the autonomic system
Dorsal nucleus of Clarke is part of it
What is the function of lamina 8
Cells are involved in modulating motor output to skeletal muscle
What are the functions of lamina 9
Contains alpha and phy motor neurons
- alpha motor neurons are large and multipolar cells giving rise to ventral root fibers to supply skeletal muscles
- phy motor neurons are smaller cells giving rise to intra fusas muscle fibers
What are the functions of lamina 10
Cells that surround the central canal and are mostly involved in the communication between different spinal levels. Axons cross over
List the spinal cord nuclei
- marginal zone
- substantia gelatinosa
- nucleus proprius
- dorsal nucleus of Clarke
- IMN : intermediolateral nucleus
- MNs lateral and medial motor neurons
What is the function of the marginal zone
Spinal cord nucleus
Relays pain and temperature sensation to the brain
What is the function of substantia gelatinosa
Spinal cord nucleus
Relays pain, temperature and light touch sensations to the brain
What is the function of nucleus proprius ?
Spinal cord nucleus
Relays mechanical and temperature sensations to the brain
What is the function of dorsal nucleus of Clarke ?
Only found in spinal segment from C8 to L3
Relays uncounscious proprioceptive information to the brain
