ANAT 2646 Ascending Tracts

ANAT 2646 Ascending Tracts - Ascending Tracts Internal...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Ascending Tracts Internal Structure of the Spinal Cord • Grey matter – cervical and lumbar enlargements • White matter – most abundant superiorly Cell Types • alpha • gamma • propriospinal • medium sized relay neurons • Lamina of Rexed Spinal Ganglia • Unipolar- cetrifugal, centripetal • Thoracic - 50,000 • Cervical and lumbar- 100,000 • Enter both dorsal and ventral roots Conscious Sensation • Perceived by cerebral cortex • Exteroceptive -vision, hearing, touch, pressure, heat, cold, pain • Proprioceptive - position sense, kinesthetic sense Unconscious Sensation • Perceived in the cerebellum • Proprioception - motor coordination • Enteroception - visceral reflexes Somatic Sensory Pathways • first order neuron is in DRG • second order neuron’s cell body is ipsilateral • second order neuron’s axon terminates in the contralateral thalamus • Third order neurons project to somatosensory cortex Somatic Sensory Pathways II • Somatotopic • Modulated by interneurons Dorsal Column-Medial...
View Full Document

Page1 / 20

ANAT 2646 Ascending Tracts - Ascending Tracts Internal...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online