Sensory and motor innervation of bird intrafusal muscle fibers.
1. Most bird muscle spindles are supplied by only one primary afferent. 2. Secondary afferents occur irregularly. 3. Sensory terminals are covered by a basal lamina and a collagenous sheath. 4. Two types of motor terminal are recognized which can be referred to specific types of intrafusal fiber. 5. The sensory and motor innervation of bird intrafusal fibers is less understood than that of mammalian intrafusal fibers.
Maier
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Department of Cell Biology, University of Alabama, Birmingham 35294.
D000344:Afferent Pathways / Q000033:anatomy & histology; D000818:Animals; D001717:Birds / Q000033:anatomy & histology*; D008322:Mammals; D009046:Motor Neurons / Q000166:cytology; D009132:Muscles / Q000294:innervation*; D009475:Neurons, Afferent / Q000166:cytology