neuroanatomy and physiology of the spinal cord Flashcards
(19 cards)
what are the enlargements along the spinal cord for?
the areas concerned with the upper and lower extremities
what does the filum terminale turn into?
the coccygeal ligament
what is the gray matter primarily made up of?
neuron bodies and glial cells
what is the white matter made up of?
mylinated axons
T/F the white matter contains both ascending and descending tracts
true!
Name the areas labeled A, B, C
A=dorsal funiculu
B=lateral funiculus
C=ventral funiculus
the medially situated fibers of the dorsal horn are the _____
heavily mylinated Ia/b, A-alpha, II fibers
the more laterally placed fibers of the dorsal horn are the ___________
small diameter, non-myelinated C fibers
A-delta fibers enter the dorsal horn _______ to the other two groups through ________
intermediate, lissauers tract
in the ventral horn the most medial fibers are concerned with __________
axial musculature
what are the nerves on the lateral portion of the ventral horn concerned with?
extremities
the anterior portion of the ventral horn is concerned with what?
muscles of extension
the posterior portion of the ventral horn are concerned with _______
the muscles involved in flexion
what are the four minimum components necessary for a reflex to occur?
receptor, afferent limb, effernt limb, effector organ
what is the role of the afferent limb in the reflex reaction?
carries the stimulus into the CNS
what is the role of the effernt limb during the reflex reaction?
carries the impulse for the response out of the CNS (i.e. alpha motor neuron)
what are example of an effector organ as part of the relex reaction?
skeletal muscle and glands
what is an example of the stretch reflex or deep tendon reflex
the patellar ligament knee jerk
what can the GTO do if tension gets to high within the tendon?
autogenic inhibition
