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Flashcards on Muscle Attachments, Action, and Nerve Innervation
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Serratus posterior superior
Joint position sense (proprioception)
Serratus posterior inferior
Joint position sense (proprioception)
External Intercostals
Active during inspiration
Internal Intercostals
Active during expiration
Diaphragm
Descends during inspiration; innervated by phrenic nerve (C3, 4, 5)
Rectus abdominus
Trunk flexion and spinal stabilization
External oblique
Unilateral: trunk contralateral rotation and ipsilateral side bending; Bilateral: trunk flexion and spinal stabilization
Internal oblique
Unilateral: trunk ipsilateral rotation and side bending; Bilateral: trunk flexion and spinal stabilization
Quadratus lumborum
Unilateral: trunk ipsilateral side bending; Bilateral: spinal extension and fixation of the 12th rib during inspiration