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Trunk muscles

Muscles of the deep trunk and of respiration

QuestionAnswer
Intertransversarii Origin Transverse process of C7-T2 and TP of L5-T11
Intertransversarii Insertion TP of vertebrae directly above the origin
Intertransversarii Action Lateral flexion of the spine Extension of the spine
Rotatores Origin Transverse process of all vertebrae
Rotatores Insertion Spinus process of all vertebrae, 1-2 above origin
Rotatores Action Rotation of the spine to the opposite side extension of the spine
Interspinales Origin Spinus processes of T2-C3 Spinus processes S1-L2
Interspinales Insertion SP of vertebrae directly above origin
Interspinales Action Extension of the spine
Multifidus Origin Posterior sacrum Transverse processes of all vertebrae except C1-C3
Multifidus Insertion Spinus processes of all vertebrae except C1: 2-4 vertebrae above origin
Multifidus Action Lateral flexion of the spine Rotation of the spine to the opposite side.
Spinalis Origin Spinus process of T11-L2 SP of C5-T1
Spinalis Insertion SP of T1-T8 SP of C1-C2
Spinalis Action Extension of the spine Lateral flexion of the spine
Longissimus Origin Transverse Processes of C7-T9 Thoracolumbar aponeurosis
Longissimus Insertion Mastoid process of the temporal bone TP of of C1-C6 TP of all thoracic vertebrae Posterior ribs
Longissimus Action Extension of the spine Lateral flexion of the spine Rotation of the head to the same side
Iliocostalis Origin Posterior, superior surfaces of ribs 2-10 Thoracolumbar aponeurosis
Iliocostalis Insertion Transverse Processes of C6 and C7 Posterior, superior surfaces of ribs 3-12
Iliocostalis Action Extension of the spine Lateral flexion of the spine
Semispinalis Origin Transverse Processes of C7-T8 Lamina of C4-C6
Semispinalis Insertions Spinus processes of C4-T3 Occipital bone
Semispinalis Action Extension and lateral flexion of the head, neck and spine Rotation of head, neck, and spine to the opposite side
Splenius Cervicis Origin Spinus processes of T3-T6
Splenius Cervicis Insertion Transverse Processes of C1-C3
Splenius Cervicis Action Extension of the spine Lateral flexion of the spine Rotation of the spine to the same side
Splenius Capitis Origin Ligamentum nuchae Spinus Processes of C7-T3
Splenius Capitis Insertion Occipital bone
Splenius Capitis Action Extension of the spine Lateral flexion of the spine Rotation of the spine to the same side
Scalenus Anterior Origin Anterior 1st rib
Scalenus Anterior Insertion Transverse processes of C3-C6
Scalenus Anterior Actions Elevates the 1st rib Flexion of the neck Rotation of the head to the opposite side
Scalenus Medius Origin Anterior 1st rib
Scalenus Medius Insertion Transverse Processes of C2-C7
Scalenus Medius Action Elevates 1st rib Flexion of the neck Rotation of the head to the opposite side
Scalenus Posterior Origin Lateral surface of 2nd rib
Scalenus Posterior Insertion Transverse Processes of C4-C6
Scalenus Posterior Actions Elevates the 2nd rib Flexion of the neck Lateral flexion of the neck Rotation of the neck to the opposite side
Serratus Posterior Superior Origin Spinus Processes of C7-T3
Serratus Posterior Superior Insertion Superior borders of ribs 2-5
Serratus Posterior Superior Action Elevates ribs during respiration (breathing in)
Serratus Posterior Inferior Origin Spinus Processes of T11 -L3
Serratus Posterior Inferior Insertion Inferior borders of lower 4 ribs
Serratus Posterior Inferior Action Draws ribs downward during respiration (breathing out)
External Intercostals Origin Inferior border of rib above
External Intercostals Insertion Superior border of rib below
External Intercostals Action Elevates ribs during respiration (breathing in)
Internal Abdominal Oblique origin Iliac Crest
Internal Abdominal Oblique Insertion Abdominal aponeurosis Lower 5 ribs
Internal Abdominal Oblique Action Rotation of trunk to same side Lateral flexion of the trunk
External Abdominal Oblique Origin Lateral surfaces of ribs 5-12
External Abdominal Oblique Insertion Abdominal aponeurosis Iliac crest
External Abdominal Oblique Action Rotation of trunk to same side Lateral flexion of the trunk Compresses abdominal contents
Internal Intercostals Origin Superior border of rib below
Internal Intercostals Insertion Inferior border of rib above
Internal Intercostals Action Draws ribs downward during respiration (breath out)
Transversus Abdominus Origin Inguinal ligament Iliac crest Thoracolumbar aponeurosis Costal cartilages 7-12
Transversus Abdominus Insertion Abdominal aponeurosis
Transversus Abdominus Action Compression of abdominal contents
Quadratus Lumborum Origin Posterior iliac crest
Quadratus Lumborum Insertion Inferior surface of 12th rib Transverse processes of L1-L5
Quadratus Lumborum Action Lateral flexion of the lumbar spine
Rectus Abdominus Origin Pubic Symphasis Pubic Crest
Rectus Abdominus Insertion Costal cartilages of 5th, 6th, 7th of ribs Xiphoid process
Rectus Abdominus Action Flexion of the trunk Lateral flexion of the trunk
Sternocleidomastoid Origin Sternal head: Manubrium Clavicular head: Medial clavicle
Sternocleidomastoid Insertion Mastoid process of temporal Occipital bone
Sternocleidomastoid Action Flexion of the head Lateral flexion of the head Rotation of the head to the opposite side
Created by: JPZepeda
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