Muscles of the head trunk and pelvis
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Muscles of the head trunk and pelvis
Muscles head trunk pelvis
origin and insertion of Muscles of the head trunk and pelvis
: Sternal head: anterior surface of manubrium
: superior surface of medial third of clavicle.
: Mastoid process of temporal bone and superior nuchal line of occipital bone.
Acting unilaterally, laterally flexes and rotates the head and neck so the ear approaches the shoulder of the same side.
Acting bilaterally, flex the neck.
Superficial layer of the back muslces
Origin of splenius
Nuchal ligament and spinous processes of C7 - T3 or T4 vertebrae
Insertion of splenius capitis
Mastoid process of temporal bone and lateral third of superior nuchal line of occipital bone
Insertion of splenius cervicis
Transverse process of C1-C3 or C4 vertebrae
Intermediate layer of the back muscles
Erector spinae (Sacrospinalis)
Common origin of the erector spinae muscles
Broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacral and inferior lumbar spinous processes, and supro-iliac ligament.
Fibers run superiorly to ribs and cervical transverse processes.
To ribs between tubercles and angles, to transverse processes in thoracic and cervical regions, and to mastoid process of temporal bone.
Insertion of spinalis
To spinous processes in the upper thoracic region and to skull.
Deep layer of back muscle
Transverso-spinal muscle group:
Semispinalis - Superficial
multifidus - deeper
rotatores - deepest
Transverse process of C4 - T12
superomedially to occipital bone and spinous processes in thoracic and cervical regions, spanning 4 - 6 segments.
Semispinalis main action
Extend head, thoracic and cervical regions of vertebral column and rotate them contralaterally.
Posterior aspects of sacrum and ilium, transverse processes of thoracic and lumbar vertebrae, and articular processes of the C4 - C7
Superomedially to entire length of spinous processed of vertebrae above, spannin 2 - 4 segments
Multifidus main action
Stabilizes vertebrae during local movements of vertebral column. Unilateral contraction rotates to contralateral side.
Transverse processes of vertebrae
Pass superomedially to attach to the root of the spinous processes of the next one or two vertebrae superiorly, spanning 1 - 2 segments
Rotatores main action
Proprioception organs. Stabilize vertebrae and assists with local extension and rotary movements of vertebral column.
Which 3 muscles form the Minor Deep Layer of the back.
Interspinal, intertransverse, levatores costarum.
Muscles in the thoracic wall
External intercostals (superior layer)Internal intercostals (middle layer)Innermost intercostals (deepest layer)
Muscles in the thoracic wall superior attachment
Inferior border of ribs
Muscles in the thoracic wall inferior attachment
Superior border of ribs below
Muscles in the thoracic wall main action
Elevate ribs: external intercostals and probably innermost intercostalsDepress ribs: Internal intercostals
External Oblique origin
External surface of 5th-12th ribs.
External Oblique insertion
Linea alba pubic tubercle, and anterior half of iliac crest.
External Oblique main action
Compress and support abdominal viscera, flex and rotates trunk.
Internal oblique origin
Thoracolumbar fascia, anterior two-thirds of iliac crest and lateral half of inquinal ligament.
Internal oblique insertion
Inferior borders of 10-12 ribs, linea alba, and pubis via conjoint tendon.
Internal oblique main action
Compress and support abdominal viscera. Flex and rotate trunk.
Innermost of the three flat abdominal muscles.
Transverse abdominal origin
Internal surface of 7-12 costal cartilages, thoracolumbar fascia, iliac crest, and lateral third of inquinal ligament.
Transverse abdominal insertion
Linea alba with aponeurosis of internal oblique, superior ramus of pubis
Transverse abdominal main action
Compress and support abdominal viscera
Rectus abdominis origin
Pubic symphysis and pubic crest
Rectus abdominis insertion
Xiphoid process and 5-7 costal cartilages.
Rectus abdominis main action
Flex trunk, compress abdominal viscera, and stabilizes and controls tilt of pelvis.
Muscles of the posterior abdominal wall
Quadratus lumborum origin
Medial half of inferior border of 12th rib and tips of lumbar transverse processes
Quadratus lumborum insertion
Iliolumbar ligament and iliac crest
Quadratus lumborum main action
Extends and laterally flexes v.column; fixes 12th rib during respiration.