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Trunk muscles
Muscles of the deep trunk and of respiration
Question | Answer |
---|---|
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 |