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Trunk & Spine

muscle attachments

QuestionAnswer
Transverse Abdominis (Lower Fibers) O: Thoracolumbar Fascia, Ant 3/4 of Iliac Crest, Lat 1/3 of Inguinal ligament; I: Linea Alba below umbilicus and into pubic symphysis
Transverse Abdominis (Upper Fibers) O: Cartilage of lower 6 ribs; I: Linea Alba superior to umbilicus
Pyramidalis O: Front of pubis and anterier pubic ligament; I: Linea alba midway b/w pubic bone & umbilicus
Rectus Abdominis (1st Section) O: Inner origin of 2nd section of RA; I: Pubic crest & symphysis, also lateral expansion to opposite side
Rectus Abdominis (2nd Section) O: From 1st section of RA; I: Into 3rd section of RA
Rectus Abdominis (3rd Section) O: From 2nd section of RA; I: Into 4th section of RA
Rectus Abdominis (4th Section: Lateral) O: From 3rd section of RA; I: Into costocartilage of 6th & 7th rib
Rectus Abdominis (4th Section: Medial) O: From 3rd section of RA; I: Into cartilage of 5th rib and side of xyphoid process
External Oblique (Anterior Fibers) O: Interdigitates surface of ribs 5-8; I: Into Linea Alba through aponeurosis
External Oblique (Lateral Fibers) O: Ribs 9-12 interdigitate with serratus and lats; I: Anterior lip of iliac crest to ASIS into inguinal ligament
Internal Oblique (Anterior Fibers) O: Lateral 2/3 of inguinal ligament and Anterior iliac crest; I: With TVA into crest of pubis and into Linea Alba thru an aponeurosis
Internal Oblique (Lateral Fibers) O: Middle 1/3 of Iliac Crest and Thoracolumbar fascia; I: Inferior border of 10-12 ribs and Linea Alba thru aponeurosis
Quadratus Lumborum (Costal Fibers) O: Iliolumbar ligament, Posterior Iliac Crest; I: Inferior border of 12th rib
Quadratus Lumborum (Spinal Fibers) O: Posterior 1/2 of Iliac Crest; I: Transverse Processes of L1-4
Multifidus (Lumbosacral) O: Back of Sacrum, Medial and Posterior Iliac Spine, Mamillary processes of Lumbar Vertebrae; I: Spinous Processes of T11-L5
Multifidus (Thoraco-Lumbar) O: Transverse processes of Thoracic Vertebrae; I: Spinous Processes of C6-T11
Iliocostalis Lumborum O: Surface of broad tendon attached to the sacrum and external lip of iliac crest and the thoracolumbar fascia; I: Inferior borders of lower 7 ribs (7-12) @ the angle
Iliocostalis Thoracis O: Upper border of Ribs 12-7 @ angles; I: Inferior border of Ribs 1-6 @ angles
Longissimus Lumborum O: Spinous processes of all lumbar and sacral vertebrae thru fascial attachment; I: Inferior borders of Ribs 9-12 (just lateral to Transverse Processes)
Longissimus Thoracis O: Transverse Processes of all thoracic vertebrae (T1-12); I: To the adjacent Ribs: 1-9
Spinalis Lumborum O: Arise from Spinous processes of sacral vertebrae; I: Insert into Lumbar Spinous processes 1-3
Spinalis Thoracis O: Arise from Spinous Processes of L3-T10; I: Insert into Spinous processes of T2-8
Semispinalis Thoracis O: Arise from Transverse processes of T1-12; I: All thoracic (T1-12) and lower 4 cervical (C4-7) spinous processes (combined with cervicis)
Rotatores Lumborum O: Sacrum and Transverse processes of Lumbar (L1-5) to Cervical Vertebrae; I: Spinous process 1-2 levels up (L5-T12)
Rotatores Thoracis O: Sacrum and Transverse Processes of Lumbar to Cervical Vertebrae (T1-12); I: Spinous processes 1 level up (SP of C7-T11)
Serratus Posterior (Inferior Fibers) O: Spinous processes of T11-L2; I: Inferior border of Ribs 9-12, just medial to angles
Serratus Posterior (Superior Fibers) O: Spinous Process of C6-T2; I: Posterior surface of Ribs 2-5
Sternalis O: Manubrium and Inferior-Medial clavicle; I: Superior Medial Fascia of 4th Rectus
Anterior Intercostals O: Inferior border of superior rib; I: Superior border of inferior rib
Posterior Intercostals O: Inferior border of superior rib ; I: Superior border of inferior rib