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Iliocostalis muscle has a common origin from the iliac crest, the sacrum, the thoracolumbar fascia, and the spinous processes of the vertebrae from T11 to L5. [1]Iliocostalis cervicis (cervicalis ascendens) arises from the angles of the third, fourth, fifth, and sixth ribs, and is inserted into the posterior tubercles of the transverse processes of the fourth, fifth, and sixth cervical vertebrae.
The iliocostalis originates from the sacrum, erector spinae aponeurosis, and iliac crest. The iliocostalis has three different insertions according to the parts: iliocostalis lumborum has the lumbar part (where its insertion is in the 12th to 7th ribs). iliocostalis thoracis where its insertion runs from the last 6 ribs to the first 6 ribs.
The quadratus lumborum muscle originates by aponeurotic fibers into the iliolumbar ligament and the internal lip of the iliac crest for about 5 centimetres (2.0 in). It inserts from the lower border of the last rib for about half its length and by four small tendons from the apices of the transverse processes of the upper four lumbar vertebrae.
The piriformis muscle (from Latin piriformis ' pear-shaped ') is a flat, pyramidally-shaped muscle in the gluteal region of the lower limbs. It is one of the six muscles in the lateral rotator group. The piriformis muscle has its origin upon the front surface of the sacrum, and inserts onto the greater trochanter of the femur. Depending upon ...
The longissimus thoracis et lumborum is the intermediate and largest of the continuations of the erector spinae.. In the lumbar region (longissimus lumborum), where it is as yet blended with the iliocostalis, some of its fibers are attached to the whole length of the posterior surfaces of the transverse processes and the accessory processes of the lumbar vertebrae, and to the anterior layer of ...
The psoas major (/ ˈ s oʊ. ə s / or / ˈ s oʊ. æ s /; from Ancient Greek: ψόᾱ, romanized: psóā, lit. 'muscles of the loins') is a long fusiform muscle located in the lateral lumbar region between the vertebral column and the brim of the lesser pelvis.
The interspinales are short muscle fascicles, found in pairs between the spinous processes of the contiguous vertebrae, one on either side of the interspinal ligament.. In the cervical region, the cervical interspinales are most distinct, and consist of six pairs, the first being situated between the axis and third vertebra, and the last between the seventh cervical and the first thoracic.
Laterally, the ligament attaches onto the posterior part of the inner lip of the iliac crest. [1] More precisely, its lateral attachment is by two main bands: [2] the superior band (which is one of the attachments of the quadratus lumborum muscle) attaches onto the iliac crest anterior to the sacroiliac joint.