Kinesiology 2222A/B Lecture 1: 7-TrunkMuscles pt.2
7 Dec 2017
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Innervated by dorsal rami: makes sense; physically close, tiny, attach vertebrae to vertebrae, assortment of function, generally called transversospinalis muscles", they aid in the extension, lateral flexion, and rotation of vertebrae innervated again by dorsi rami. Interspinalis: attaches successive spinous processes (i. e. t6 and t7) Inner-most layer: work with & surround rectus abdominis, external oblique goes on superficial side. Intercostals (between the ribs: run from rib to rib, external intercostal muscle, fibres run towards front pockets, when shorten, cause ribs to lift, allows you to take in deep breath. Just underneath external intercostals: fibres run towards back pockets, pull ribs back down to resting, expiration, typically only used during forced/maximal respiration, any muscle with attachments to ribs will assist in forced breathing. Innermost intercostal muscle: helps locate intercostal nerve & vessels, run in subcostal groove, sandwiched between internal & innermost intercostal muscles. Innervated via phrenic nerve: c3, c4, & c5 roots contribute to phrenic nerve.
