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Trunk/Spinal Column
Muscle of the Trunk and Spinal Column (Origins, Insertions, Actions, & Nerves)
| Question | Answer |
|---|---|
| Origin of Sternocleidomastoid | Manubrium of sternum, anterior superior surface of medical clavicle |
| Insertion of Sternocleidomastoid | Mastoid process |
| Action of Sternocleidomastoid | Extension of head/Rotation to contralateral side/Lateral flexion to ipsilateral side |
| Innervation of Sternocleidomastoid | Spinal accessory |
| Origin of Splenius Cervicis | Spinous processes of the 3rd though 6th thoracic vertebrae |
| Insertion of Splenius Cervicis | Transverse processes of the first three cervical vertebrae |
| Action of Splenius Cervicis | Extension of the cervical spine |
| Innervation of Splenius Cervicis | Posterior lateral brances of cervical nerves 4-8 |
| Origin of Splenius Capitis | Spinous processes of the 7th cervical and upper three or four thoracic vertebrae |
| Insertion of Splenius Capitis | Mastoid process and occipital bone |
| Action of Splenius Capitis | Extension of the head and cervical spine |
| Innervation of Splenius Capitis | Posterior later branches of cervical nerves 4-8 |
| Origin of Quadratus lumborum | Posterior inner lip of the iliac crest |
| Insertion of Quadratus lumborum | Approx 1/2 the length of the lower border of the 12th rib and the transverse process of the upper four lumbar vertebrae |
| Action of Quadratus lumborum | Lateral flexion to the ipsilateral side |
| Innervation of Quadratus lumborum | Branches of T12, L1 nerves |
| Origin of Rectus abdominis | Crest of pubis |
| Insertion of Rectus abdominis | Cartilage of 5th, 6th, and 7th ribs and xiphoid process |
| Action of Rectus abdominis | Lumbar flexion |
| Innervation of Rectus abdominis | Intercostal nerves |
| Origin of External oblique abdominal | Borders of lower eight ribs at side of chest dovetailing with the serratus anterior |
| Insertion of External oblique abdominal | Crest of ilium, inquinal ligament, and crest of pubis |
| Action of External oblique abdominal | Lumbar flexion |
| Innervation of External oblique abdominal | Intercostal nerves |
| Origin of Internal oblique abdominal | Inguinal ligament, crest of ilium, and lumbar fascia |
| Insertion of Internal oblique abdominal | Costal cartilage of 8th, 9th, and 10th ribs and linea alba |
| Action of Internal oblique abdominal | Lumbar flexion |
| Innervation of Internal oblique abdominal | Intercostal nerves |
| Origin of Transversus abdominis | Inguinal ligament, iliac crest, inner surface of costal cartilages of lower six ribs, lumbar fascia |
| Insertion of Transversus abdominis | Crest of the pubis and the iliopectineal line |
| Action of Transversus abdominis | Forced expiration by pulling the abdominal wall inward |
| Innervation of Transversus abdominis | Intercostal nerves |
Created by:
pihlma
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