Changes

===Ascending Pathways===

===Ascending Pathways===

[[Image:The Ascending Pathways.jpg|thumb|right|150px|Ascending Pathways, Sarah Hamilton ''RVC'', 2008]]

[[Image:The Ascending Pathways.jpg|thumb|right|150px|Ascending Pathways, Sarah Hamilton ''RVC'', 2008]]

 

Sensory information enters the [[Spinal Cord - Anatomy &  Physiology|spinal cord]] on the same side of the body as the stimulus. Ascending tracts cross over the midline of the body to the contralateral side of the [[Forebrain - Anatomy & Physiology#Thalamus|thalamus]]. The [[Forebrain - Anatomy & Physiology#Thalamus|thalamus]] directs the signal to the [[Forebrain - Anatomy & Physiology#Cerebral Cortex|cerebral cortex]] for conscious perception. The pathway is direct with very few [[PNS Structure - Anatomy & Physiology#Nerve Fibre|neurones]] involved.

*Sensory information enters the [[Spinal Cord - Anatomy &  Physiology|spinal cord]] on the same side of the body as the stimulus.

*Ascending tracts cross over the midline of the body to the contralateral side of the [[Forebrain - Anatomy & Physiology#Thalamus|thalamus]].

*The [[Forebrain - Anatomy & Physiology#Thalamus|thalamus]] directs the signal to the [[Forebrain - Anatomy & Physiology#Cerebral Cortex|cerebral cortex]] for conscious perception.

**The pathway is direct, with very few [[PNS Structure - Anatomy & Physiology#Nerve Fibre|neurones]] involved.

====1. Dorsal Columns====

====1. Dorsal Columns====

*Transmits information from touch and kinaesthesia, i.e low threshold information.

Dorsal columns transmit information from touch and kinaesthesia; these are both classified as low threshold information. There are two major dorsal columns; the ''gracile fasiculus'' situated medially which conveys information from the hindlimbs and caudal trunk and the ''cuneate fasciculus'' which is situated more laterally and conveys information from the forelimbs and cranial trunk.

*There are two major dorsal columns:

** '''The gracile fasiculus'''

*** Situated medially.

*** Conveys information from the hindlimbs and caudal trunk.

** '''The cuneate fasciculus'''

*** Situated more laterally.

*** Conveys information from the forelimbs and cranial trunk.

 

====2. Spinothalamic Tracts====

====2. Spinothalamic Tracts====

*Transmits information from temperature and "pin prick" pain.

*Transmits information from temperature and "pin prick" pain.