Ascending Tracts of the Spinal Cord and the Somatosensory System

What is SENSATION?

What are the Main Cutaneous Sensations?

1) Touch/Pressure

2) Vibration

3) Thermal

4) Pain

What are the different Primary Sensory Nerve Fibres?

What are TACTILE RECEPTORS?

Tactile Receptors - Close to Surface of Skin

Tactile Receptors - Deeper

How does MECHANICAL TRANSDUCTION work?

Why is the SPATIAL DISTRIBUTION of Electrons IMPORTANT?

Map of Mechanoreceptor Density

What is the Perception of Sensation?

What are Ascending Tracts?

Getting the sensory information from the periphery to the brain

What are the two types of Sensory Information carried in Ascending Tracts?

1) Proprioceptive 

- Information originating from inside the body (from muscles, joints, tendons)

2) Exteroceptive

- Information originating from outside the body  (pain, temperature, touch)

Anatomy of the Ascending Tracts

Dorsal Column-Medial Lemniscus Pathway?

What are the FIRST ORDER NEURONS?

Topographical Organization of the First-Order Neurons to Second-Order Neurons6

What are SECOND ORDER NEURONS?

What are THIRD ORDER NEURONS?

Summary of Dorsal Column-Medical Lemniscus Pathway

What happes of there is DAMAGE to the Dorsal Column?

What is the SPINOTHALAMIC TRACT?

First Order Neurones of the Spinothalamic Tract

Second Order Neurones of the Spinothalamic Tract

Third Order Neurones of the Spinothalamic Tract

Summary of the Spinothalamic Tract

What happes of there is DAMAGE to the Anterolateral Column?

What is the SPINOCEREBELLAR TRACTS?

Spinocerebellar Tract Anatomy

What is the PATHWAY of the Dorsal Spinocerebellar Tract?

Spinal Cord Injury - ANTERIOR CORD SYNDROME

Spinal Cord Injury - BROWN-SEQUARD SYNDROME

Spinal Cord Injury - COMPLETE SPINAL CORD TRANSECTION