🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →

HomeClass Notes1,200,000CA670,000

Anatomy and Cell Biology 3319 Lecture : Anatomy Notes

31 views2 pages

purplejackal117

20 Feb 2012

School

Western University

Department

Anatomy and Cell Biology

Course

Anatomy and Cell Biology 3319

Professor

Peter Merrifield

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Elements of ascending sensory systems: afferent neuronal signals from skin and deeper structures are segregated in the spinal cord (ex. subthalamic tract vs. dorsal funiculi). Axons of pain and temperature cross the midline in the spinal cord. Axons of discriminative touch and conscious proprioception ascend ipsilaterally to the medulla. After synapsing in the medulla, the axons cross the midline. The ventral posterolateral nuclei (vpl) in the thalamus is the primary site of termination for somatosensory information to the postcentral gyrus. It acts as a relay station for the sensory info ascending to the primary sensory areas of the cerebral cortex. The dorsal column pathway or medial lemniscus sensory system (located at dorsal funiculus) carries information on discriminative touch, pressure, vibratory sensation, and conscious joint position. These are senses that can be localized very precisely on the body surface. Information from the lower limbs enters the lumbar spinal cord at the dorsal horn then ascends via the fasiculus gracilis (medial).

Related Documents

Anatomy and Cell Biology 3319 Chapter Notes -Pontine Nuclei, Rubrospinal Tract, Skeletal Muscle

beigemosquito327

Anatomy and Cell Biology 3319 Lecture Notes - Lecture 10: Insular Cortex, Cerebellar Vermis, Cerebellar Peduncle

sangriapanda814

Anatomy and Cell Biology 3319 Lecture Notes - Lecture 10: Brainstem, Proprioception

Related Questions

A needle is inserted into the right somatosensory nucleus of the thalamus in the central nervous system and the area is injected with GABA.

A. Define the term ânucleusâ as it relates to the statement above.

B. What is GABA and what effect would GABA have on the membrane potentials of neurons in this area? Explain

C. Describe how/why GABA released from axon terminals in the following neural arrangements would alter impulse transmission:

i) an axoaxonal synapse

ii) an axodendritic synapse

D. If information relayed to this area carries precise touch, what specific somatosensensory pathway would be affected by this injection?

E. Which side of the body would be affected? Why?

F. What fiber type is associated with neurons in this pathway and what does this mean?

G. Through what structure does a primary sensory neuron from the hand enter the central nervous system?

H. Where does the first synapse for this somatosensory pathway occur?

I. Describe the type(s) of sensory information carried by this pathway.

J. Name and describe two different classes of primary sensory receptors that are associated with this pathway.

K. Discuss the common features that all primary sensory receptors possess.

L. If an adrenergic substance had been injected instead of GABA, how would this have altered neural transmission? Explain.

A needle is inserted into the right somatosensory nucleus of the thalamus in the central nervous system and the area is injected with GABA.

A. Define the term ânucleusâ as it relates to the statement above.

B. What is GABA and what effect would GABA have on the membrane potentials of neurons in this area? Explain

C. Describe how/why GABA released from axon terminals in the following neural arrangements would alter impulse transmission:

i) an axoaxonal synapse

ii) an axodendritic synapse

D. If information relayed to this area carries precise touch, what specific somatosensensory pathway would be affected by this injection?

E. Which side of the body would be affected? Why?

F. What fiber type is associated with neurons in this pathway and what does this mean?

G. Through what structure does a primary sensory neuron from the hand enter the central nervous system?

H. Where does the first synapse for this somatosensory pathway occur?

I. Describe the type(s) of sensory information carried by this pathway.

J. Name and describe two different classes of primary sensory receptors that are associated with this pathway.

K. Discuss the common features that all primary sensory receptors possess.

L. If an adrenergic substance had been injected instead of GABA, how would this have altered neural transmission? Explain.

1.All peripheral sensory input enters the spinal cord through the 2.Mechanoreceptor afferents are divided into two main classes based on(Points : 2) 3.Branches of SAI afferents terminate in ____________ where they are proposed to be the site of ____________ transduction.(Points : 2) 4.SAI afferents appear to be used by the CNS to perceive(Points : 2) 5.AII afferents have ________ receptive fields and greater sensitivity to ________ than do SAI afferents.(Points : 2) 6.Somatosensory afferents from the muscle are sensitive to ___________ while afferents from the tendon are sensitive to ___________.(Points : 2) 7.Kinesthesia is obtained by convergent afferents of the muscles, tendons, joints and___________8.Nociceptors respond to ________ stimuli and sense through use of ___________.(Points : 2) 9.First pain is transmitted through ______ receptors that carry discriminative information, and second pain is modulated by _______ receptors.(Points : 2) 10.Acute skin damage is accompanied by ____________ that is the result of local activation of nociceptors leading to ________.(Points : 2) 11.Somatic sensation retains separation of mechanosensation and __________ from nociception and ___________ which is evident from PNS to CNS.(Points : 2)12.The primary somatosensory cortex has ventral projections to(Points : 2) 13.The dorsal stream of the somatosensory cortex project to(Points : 2) 14.The dorsal column nuclei are located(Points : 2) 15.The lateral cervical nucleus is located in the ____________ and display ___________ receptive fields.(Points : 2) 16.Non-perceptual input of nociceptors influence behavior by(Points : 2)17. sensory trigeminal system is composed of the...18.The receptive fields of secondary somatosensory cortical neurons are ___________ than those of the primary somatosensory cortex.(Points : 2) 19.Receptive fields in the primary somatosensory cortex are(Points : 2)I really need help with this please! The person who is able to help me with the CORRECT answers will be compensated with 3000 points! This assignment will be graded instantly by a computer so I will know if the person actually tried or if they just put in some crazy answers just to get the points. The points will be rewarded IMMEDIATELY after the assignment is graded, which, as I stated above is done instantly by the computer once submitted. At least 75 to 80% of the questions must be correct in order to receice all 3000 points today. Thank you SO much in advance!!! :)

pucereindeer600