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2 (Cutaneous receptors (Ruffini corpuscle (Encapsulated collagen (Touch:…
2
Cutaneous receptors
Ruffini corpuscle
Encapsulated collagen
Touch: skin stretch
Hair follcicle
Unencapsulated
Touch: movement
Pacinian corpsucle
Encapsulated + layered
Touch: vibration
Merkle complex
Specialised epithelial cell
Touch, pressure, form
Meissner corpuscle
Encapsulated + layered
Touch: flutter + moveemnt
Free nerve ending
Unencapsulated
Pain, touch or temp
Cellular organisation Cerebellum
Each stripe receives precise afferent input
Climbing fibres directly to purkinje cells + mossy fibres via granule cells
Purkinje cells send efferent projections specific targets in cerebellar + vestibular nuclei
Within cerebullum, wide variety sensory information brought together + integrated primarily aid motor control
Climbing fibres, contact purkinje cells
Mossy fibres terminate in granule layer: make contacts mainly with granule cells + golgi cells
Each mossy fiber terminal syanpses on granule cell dendrites: exciting it.
Stem axons of climbing + mossy fibres provide collaterals to cerebellar nuclei en route cerebellar cortex
Ascending axons of grannule cells branch in T shaped manner: parallel fibres
Make contact with Purkinje cells + mlolecular layer interneurons
Parallel fibres extend several mm
Cytoarchitectural areas
Cellular composition six layers (limane) neocortex
50 cytoarchitectonic areas
Layers
2
External granular layer
3
External pyramidal layer
1
Molecular layer: very few neurons
4
Internal granular layer
5
Internal pyrimadal layer
6
Multiform/fusiform layer
Histology layers cerebral cortex
Cerebral cortex outer covering gray matter over hemispheres: covering gyri and sulci
Certican cortical regions simplet function: primary corticles: areas directly receiving sensory input (vision, hearing, somatic sensation) + direct limb/eye movements
Association cortex more complex. Adjacent to primary cortices: included rostral part of frontal lobes + Posterior parietal lobe + temporal lobe + anterior occipital lobe
Memory, laguage, abstraction, creativity, judgement,e motion and attention + movement
Fucntional organisation neurons retina
Pigment epithelium
Rods + Cones
Outer granular layer
Outer plexiform layer
Inner glanular layer
Inner plexiform layer
Bipolar cells
Ganglion cells
Optic nerve fibers
Skin and samatosensroy system
All peripheral terminal branches primary somatosensory axon end specific type of tissue (e.g. skin): NOT MULTIPLE
All peripheral terminal branches of 1 axons: 1 type of somatosensory receptor
Multiple somatosensory exist:
Somatosensory receptor (specialized) : Merkel cell