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Neuro-anatomy
Definitions
Prof. Saleh M. Al-Dhaheri
Head of Human Anatomy & Histology Department
Sana’a University
• Tract: is a group of nerve fibres inside the CNS having the same origin, the
same course, the same termination & the same function.
• Bundle OR Fasciculus: a group of nerve fibres inside the CNS having
the different origin, the different course, the different termination & the
different function.
• Peduncle: a thick bundle supporting part of the brain (e.g.: cerebral
peduncles & cerebellar peduncles).
• Nucleus: a group of nerve cells inside the CNS lying very close to each
other & having the same function (e.g.: nuclei of the cranial nerves).
• Ganglion: a group of nerve cells inside the CNS in relation to sensory or
autonomic nerves (e.g.: sensory ganglia of the cranial nerves).
• Synapse or Relay: is the region of contact of the axon of one neuron &
the dendrites or the cell body of another neuron.
• Pathway: a series of neurons transmitting impulses inside or outside the
CNS.
• Commissure: a band of gray matter or white matter connecting a part of
the CNS on one side with the same part on the opposite side.
• Decussation: the criss-crossing of 2 fellow tracts in the middle line.
• Lemniscus: a band of ascending sensory fibres in the brainstem. It begins
from a decussation below & ascends to end in the thalamus above.
• Exteroceptive sensation: sensation from the skin (pain, touch &
temperature).
• Proprioceptive sensation: sensations from muscles, ligaments, joints &
fascia (position, passive movements & vibrations).
• Ipsilateral: of the same side of the body.
• Contralateral: of the opposite side of the body.
Thank U

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Neuro-anatomysssssssssss Definitions.ppt

  • 1. Neuro-anatomy Definitions Prof. Saleh M. Al-Dhaheri Head of Human Anatomy & Histology Department Sana’a University
  • 2. • Tract: is a group of nerve fibres inside the CNS having the same origin, the same course, the same termination & the same function. • Bundle OR Fasciculus: a group of nerve fibres inside the CNS having the different origin, the different course, the different termination & the different function. • Peduncle: a thick bundle supporting part of the brain (e.g.: cerebral peduncles & cerebellar peduncles). • Nucleus: a group of nerve cells inside the CNS lying very close to each other & having the same function (e.g.: nuclei of the cranial nerves). • Ganglion: a group of nerve cells inside the CNS in relation to sensory or autonomic nerves (e.g.: sensory ganglia of the cranial nerves). • Synapse or Relay: is the region of contact of the axon of one neuron & the dendrites or the cell body of another neuron.
  • 3. • Pathway: a series of neurons transmitting impulses inside or outside the CNS. • Commissure: a band of gray matter or white matter connecting a part of the CNS on one side with the same part on the opposite side. • Decussation: the criss-crossing of 2 fellow tracts in the middle line. • Lemniscus: a band of ascending sensory fibres in the brainstem. It begins from a decussation below & ascends to end in the thalamus above. • Exteroceptive sensation: sensation from the skin (pain, touch & temperature). • Proprioceptive sensation: sensations from muscles, ligaments, joints & fascia (position, passive movements & vibrations). • Ipsilateral: of the same side of the body. • Contralateral: of the opposite side of the body.