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Intramuscular Innervation of Infraspinatus: A 3‐D Modeling Study
Author(s) -
Hermenegildo Jason Aldeia,
Ko Dominic M,
Johnson Marjorie,
Merrifield Peter A,
Agur Anne M
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.749.4
Subject(s) - cadaveric spasm , anatomy , muscle belly , suprascapular nerve , medicine , brachial plexus , tendon
Neuromuscular partitioning is important in defining functional differences within a muscle volume. It has been shown that individual neuromuscular partitions may be differentially affected in pathology. Neuromuscular partitions are defined by independent innervation and architectural differences. Infraspinatus (IS) is a functionally important rotator cuff muscle where neuromuscular partitioning has not been well studied. The purpose is to investigate the intramuscular innervation patterns of IS. In this pilot study, 5 formalin‐embalmed cadaveric have been dissected, digitized, and modeled to date. The suprascapular nerve (SSN) was digitized sequentially in short segments and the data was modeled using Autodesk ® Maya ® 2012. The models were used to document the intramuscular innervation patterns/neuromuscular partitions. The SSN enters IS at the spinoglenoid notch as 1–3 nerves. In three specimens, one nerve entered the IS belly and divided into 3 main branches: (1) a superior branch (br) to superior part of the muscle belly; (2) a lateral br to upper inferior belly; (3) middle br to middle and lower inferior bellies. When SSN enters as 2–3 branches, a separate lateral and/or superior branch enter their respective regions. These results provide a detailed mapping of the intramuscular innervation of IS, providing evidence of neuromuscular partitioning within the IS muscle belly.