serratus ventralis (anterior in human)
origin: ribs 1-9 or 10
insertion: medial surface of scapula
deep to the vertebral border
nerve: long thoracic
action: depresses scapula, supports
the trunk and aids in inspiration
Note that is muscle can be tagged in two places!
Anterior (deep) view of insertion, right side
serratus anterior (ventralis in cat)
origin: superior lateral surface of ribs 1-8
insertion: anterior surface along the
vertebral border of scapula
nerve: long thoracic (C5, C6, C7)
action: protracts (abducts) and rotates scapula
upward, prevents scapular winging
Serratus ventralis in the cat looks like fingers because it attaches to the ribs, but has nothing to attach to between the ribs. The name implies that it looks like a serrated knife. This is one of the five muscles that are grouped as muscles of the scapula, or sometimes as muscles that moor the scapula. The above drawings of the origin and insertion might help visualize this information (red is the origin, blue the insertion).
2009 by William C. Johnson II
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