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spine, thorax muscle

ITM origins,insertions,actions

muscleorigininsertionaction
scalenus anterior transverse processes of cervical vertebrae C3-6 to 1st rib Bilaterally-raise first 2 ribs during forced inspiration or assist neck flexion; Unilaterally-assists in lateral flexion of head to same side
scalenus medius transverse processes of cervical vertebrae C2-7 to 1st rib Bilaterally-raise first 2 ribs during forced inspiration or assist neck flexion; Unilaterally-assists in lateral flexion of head to same side
scalenus posterior transverse processes of cervical vertebra C4-6 to 2nd rib Bilaterally-raise first 2 ribs during forced inspiration or assist neck flexion; Unilaterally-assists in lateral flexion of head to same side
splenius capitis ligamentum nuchae, spinous processes of C7, T1-3 mastoid process of temporal bone, occipital bone Bilaterally-extension of neck; Unilaterally-lateral flexion and rotation of head to same side
splenius cervicis upper thoracic vertebrae T3-6 upper cervical vertebrae, transverse processes of C1,2,3 Bilaterally-extension of neck; Unilaterally-lateral flexion and rotation of head to same side
rectus abdominis pubic symphysis and crest costal cartilages of ribs 5,6,7; xiphoid process flexion of trunk, supports compression of abdominal contents
external oblique lower 8 ribs (5-12) linea alba, pubis, anterior iliac crest Bilaterally-flexion of trunk, compression of abdominal contents; Unilaterally-lateral flexion, rotation of trunk to opposite side
internal oblique inguinal ligament, anterior iliac crest, thoracolumbar aponeurosis costal cartilages of lower 4 ribs(9-12), abdominal aponeurosis and linea alba Bilaterally-flexion of trunk, compression of abdominal contents; Unilaterally-lateral flexion, rotation of trunk to same side
transverse abdominis inguinal ligament, iliac crest, thoracolumbar aponeurosis, internal surface of costal cartilages of ribs 7-12 abdominal aponeurosis and linea alba, pubis compression of abdominal contents
external intercostals (exterior surface of ribs) between adjacent ribs between adjacent ribs elevate ribs in inspiration, maintains intercostal spaces
internal intercoastals (interior surface of ribs) between adjacent ribs between adjacent ribs elevate ribs in inspiration, maintains intercostal spaces
innermost intercostals (dep to internal intercostals) between adjacent ribs between adjacent ribs elevate ribs in inspiration, maintains intercostal spaces
diaphragm first 3 lumbar vertebrae, lower 6 costal cartilages, xiphoid process of sternum central tendon of the diaphragm (clover leaf shaped aponeurosis) flattens central tendon and thus increases vertical diameter of thoracic cavity inspiration
serratus posterior superior caudal ligamentum nuchae, spinous processes of C7-T2 superior borders of 2,3,4,5 ribs raises ribs to increase thoracic cavity during inspiration
serratus posterior inferior spinous processes of T11, 12 and L1-3 inferior borders of last 4 ribs draws ribs outward and downward conteracting the inward pull of the diaphragm during expiration
quadratus lumborum posterior iliac crest 12th rib, transverse processes of lumbar vertebrae 1-4 lateral flexion of trunk or raises hip
iliocostalis - erector spinae (lateral layer) thoracolumbar aponeurosis, posterior ribs posterior ribs, cervical transverse processis Bilaterally-extension of spine, Unilaterally-lateral flexion of spine
longissimus - erector spinae (middle layer) thoracolumbar aponeurosis, lumbar and thoracic transverse processes cervical and thoracic transverse processes, mastoid process Bilaterally-extension of spine, Unilaterally-lateral flexion of spine
spinalis - erector spinae (medial layer) ligamentum nuchae, cervical and thoracic spinous processes cervical and thoracic spinous processes, occipital bone Bilaterally-extension of spine, Unilaterally-lateral flexion of spine
semispinalis - transversospinalis cervical and thoraacic transverse processes cervical and thoracic spinous processes, occipital bone (spans 3 to 6 vertebrae) Bilaterally-extension of spine; Unilaterally-rotation to opposite side
multifidus-transversospinalis sacrum, posterior superior iliac spine, transverse processes all vertebrae spinous processes of all vertebrae, inswwerting 2 to 4 vertebrae above origin Bilaterally-extension of spine; Unilaterally-rotation to opposite side
rotatores-transversospinalis transverse processes of all vertebrae spinous processes of all vertebrae, inserting on vertebra directly above origin Bilaterally-extension of spine, Unilaterally-rotation to opposite side
interspinales-segmental--transversospinalis spinous processes of cervical, lumbar and T1-2, T11-12 vertebrae spinous process of vertebrae directly above origin extension of spine
intertransversarii-segmental-transversospinalis transverse processes of cervical, lumbar and T10-12 vertebrae transverse process of vertebrae directly above Unilaterally- extension of spine; Unilaterally-lateral flexion of spine
Created by: mjjjmom