Lecture 2 - 7 basic parts of the CNS Spinal cord medulla pons brainstem midbrain cerebellum diencephalon forebrain cerebral hemishperes PN01101.JPG

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
7 basic parts of the CNS • Spinal cord • medulla • pons brainstem • midbrain • cerebellum • diencephalon • cerebral hemishperes forebrain
Background image of page 1

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

View Full DocumentRight Arrow Icon
The Subdivisions and Components of the Central Nervous System • PN01101.JPG
Background image of page 2
Spinal cord • Extends from the base of the skull to the Frst lumbar vertebra. • Receives sensory info from skin, joints, and muscles of trunk and limbs, and contains motor neurons responsible for both voluntary and re±ex movements. • Nerve Fbers bundled in 31 pairs of spinal nerves, a sensory division (dorsal root ganglia) and a motor division (ventral root). • Is thicker in regions that innervate the limbs.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Internal anatomy of the spinal cord
Background image of page 4
Internal anatomy of the spinal cord • Contains both white and grey matter. • Grey matter shaped like an “H”. Dorsal horns and ventral horns. • Dorsal horns contain sensory relay neurons, receives input from periphery • Ventral horns contains motor nuclei that innervate muscles-send output • White matter contains longitudinal tracts of ascending and descending axons grouped together by function.
Background image of page 5

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

View Full DocumentRight Arrow Icon
Spinal cord tracts • Dorsal column-sensory info travels up it to the brain. • Lateral columns-also called the cortico- spinal tracts. Take info from brain and send it to the muscles. • Ventral columns (sometimes called anterolateral column)- carry pain info up and motor info down.
Background image of page 6
Internal Structure of the Spinal Cord • PN01112.JPG
Background image of page 7

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

View Full DocumentRight Arrow Icon
General rules of spinal cord organization • neurons and axons that process and relay sensory information are found dorsally • preganglionic visceral motor neurons are found in an intermediate/lateral region • somatic motor neurons and axons are found in the ventral portion of the cord.
Background image of page 8
Brainstem • medulla-regulates blood pressure and respiration • pons-ventral- pontine nuclei, relay info from cortex to cerebellum, dorsal-respiration taste and sleep • midbrain- auditory and visual systems, substantia nigra (dopanergic neurons). Deteriorates in Parkinson’s disease.
Background image of page 9

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

View Full DocumentRight Arrow Icon
Close up of the brain stem
Background image of page 10
Brain stem • Target or source for all cranial nerves that deal with sensory and motor function in the head and neck. • Nuclei within brainstem are the targets and sources of these nerves. • Also is a throughway which all info going up and down must pass. • Because of its small area and restricted blood supply-it is very susceptible to damage.
Background image of page 11

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

View Full DocumentRight Arrow Icon
Parkinson’s- loss of dopamine making neurons in the midbrain
Background image of page 12
Background image of page 13

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

View Full DocumentRight Arrow Icon
The brainstem is all you need to live Mike, as everyone knows, was the arguably lucky fowl who survived a beheading by a Colorado farmer in 1945, thriving for 18 months with only a brain stem. Fed on corn dropped directly into his gullet, Mike choked to death during a sideshow tour in 1947, when the farmer — after forging a new and profitable relationship with Mike — was unable to clear his esophagus, having forgotten to bring along the eyedropper he used for that purpose.
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 02/28/2011.

Page1 / 71

Lecture 2 - 7 basic parts of the CNS Spinal cord medulla pons brainstem midbrain cerebellum diencephalon forebrain cerebral hemishperes PN01101.JPG

This preview shows document pages 1 - 15. Sign up to view the full document.

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