INNERVATION DISTRIBUTION PATTERN, NERVE ENDING STRUCTURE, AND FIBER TYPES IN PIGEON SKELETAL-MUSCLE

Citation
Jr. Torrella et al., INNERVATION DISTRIBUTION PATTERN, NERVE ENDING STRUCTURE, AND FIBER TYPES IN PIGEON SKELETAL-MUSCLE, The Anatomical record, 237(2), 1993, pp. 178-186
Citations number
51
Categorie Soggetti
Anatomy & Morphology
Journal title
ISSN journal
0003276X
Volume
237
Issue
2
Year of publication
1993
Pages
178 - 186
Database
ISI
SICI code
0003-276X(1993)237:2<178:IDPNES>2.0.ZU;2-2
Abstract
Four fiber types have been characterized in different pigeon skeletal muscles according to their innervation pattern (nerve ending structure and innervation distribution) and histochemical properties (SDH and m -ATPase activities). All fast fibers, types IIA and IIB, present aggre gated distribution of their nerve endings with ''en plaque'' structure s and very low innervation frequencies. The two kinds of slow fibers r ecognized are multiple innervated and present higher innervation frequ encies. However, type I fibers have nerve terminals in small knobs wit h uniform localization, whereas type III fibers present ''en grappe'' nerve endings, which tend to be randomly distributed. Fiber type compo sition of skeletal muscles has been found closely related, to their bi omechanical function. Fast fibers are predominant in muscles with an a ctive role in locomotive movements, whereas slow fibers are mainly or exclusively located in postural muscles. (C) 1993 Wiley-Liss, Inc.