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Trunk/Spinal Column

Muscle of the Trunk and Spinal Column (Origins, Insertions, Actions, & Nerves)

QuestionAnswer
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