Serratus Posterior Inferior Muscle
Origin: The spinous processes of the T11 to L2/L3 and their corresponding supraspinous ligaments, blending with the lumbar part of the thoracolumbar fascia
Insertion: Inferior borders and outer surfaces of the lower four ribs (9th -12th), lateral to their angles
Actions: Forced expiration
Innervation: Ventral primary rami of T9 – T12
Blood Supply: Dorsal branches of the subcostal arteries
Primary Actions of the Serratus Posterior Inferior
Agonists:
- Transversus abdominis
Antagonists:
- Serratus posterior superior
- Levatores costarum brevis
- Levatores costarum longi
Rectus abdominis, external oblique, and internal oblique assist with forced expiration.
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Muscle Pain Information: The serratus posterior inferior muscle contributes to in the lower back.
An excellent book for those beginning the study of anatomy. Coloring helps memory retention.
For intermediary anatomy students learning skeletal and muscle structure.
For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!