Anatomy and Cell Biology 3319 Lecture : Anatomy Notes

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purplejackal117

20 Feb 2012

School

Western University

Department

Anatomy and Cell Biology

Course

Anatomy and Cell Biology 3319

Professor

Peter Merrifield

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Document Summary

Entry point for sensory information in spinal nerves. Contains visceral motor neurons thoracic sympathetic and sacral parasympathetic. Ascending and descending sensory and motor pathways to the brain; crossed and uncrossed. Cerebrospinal fluid can be sampled below the end of the spinal cord. Lesions in different parts of the spinal cord produce sensory and motor abnormalities related to the functions of the tracts that have been damaged. Function of the spinal cord: through the spinal nerves that attach to it, it is involved in sensory and motor innervation of the entire body. It provides a two-way conduction pathway for signals between the body and the brain. The spinal cord extends from the foramen magnum at the occipital bone to the first or second lumbar vertebra (l1 or l2). The end of the spinal cord is called the conus medullaris. The filum terminale attaches and anchors the spinal cord to the coccyx.

Related Questions

Animal Physiology-

1. Our case study included a variety of reflexes, some of which were autonomic reflexes. This means that motoroutput occurred at the level of cardiac muscle, smooth muscle, or secretory epithelial cells. Autonomic reflexescan be categorized according to the location where motor information exits the CNS. Consequently, thepupillary light reflex is a: (a) parasympathetic reflex (b) sympathetic reflex

11. Each retina contains a layer of ganglion cells. Axons from these neurons project into two regions on eachside of the body midline. Axons that enable vision project into the: (a) mibrain (b) thalamus (c) sensory cortex

13. Where does central integration occur for reflex turning of the head and the pupillary light reflex? (a) sensory cortex (b) midbrain (c) brainstem

16. Is every reflex associated with the head an autonomic reflex? yes or no

17. Is reflex turning of the head an autonomic reflex? yes or no

20. Sympathetic motor output exits the CNS only at the level of the: (a) brainstem and pelvic cord (b) thoracolumbar spinal cord (c) brainstem and cervical spinal cord

22. How many types of motor nuclei are found within the cord? (a) two, i.e. motor and autonomic (b) three, i.e. motor, sympathetic, and parasympathetic

23. How many motor nuclei are found at the level of the thoracolumbar cord? (a) four (b) two

31. Neurons within the intermediolateral nuclei are innervated by axons that project through the bulbospinalfiber tracts. These tracts originate within the: (a) motor cortex (b) midbrain (c) brainstem

33. Are the left and right paravertebral ganglion chains found along the length of the spinal cord? yes or no

magentatrout753

Assume there are nerve fibers that travel from the brain to themotor neurons in the spinal cord involved in the patellar reflexarc. some of these nerve tracts stiumlate the spinal neurons whileother inhibit the same neurons. Hypothesize on the mechanism thatwould result in the delta mV differences observed between thereflexes with and without reinforcement.

apricotwhale654

Johnny was in a freak traumatic accident where he suffered bilateral transection of the spinal cord at C7. Discuss the impact of this injury on the sensory and motor branches of the nervous system.

Anatomy and Cell Biology 3319 Lecture : Anatomy Notes

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