Multifidus muscle
Encyclopedia
The multifidus muscle consists of a number of fleshy and tendinous fasciculi
, which fill up the groove on either side of the spinous processes of the vertebrae, from the sacrum
to the axis
. The multifidus is a very thin muscle.
Deep in the spine, it spans three joint segments, and works to stabilize the joints at each segmental level.
The stiffness and stability makes each vertebra work more effectively, and reduces the degeneration of the joint structures.
These fasciculi arise:
Each fasciculus, passing obliquely upward and medialward, is inserted into the whole length of the spinous process
of one of the vertebræ above.
These fasciculi vary in length: the most superficial, the longest, pass from one vertebra to the third or fourth above; those next in order run from one vertebra to the second or third above; while the deepest connect two contiguous vertebrae.
Multifidus lies deep to the Spinal Erectors, Transverse Abdominus, and Abdominal external oblique muscle
/Abdominal external oblique muscle
.
Muscle fascicle
In anatomy, a fascicle is a bundle of skeletal muscle fibers surrounded by perimysium, a type of connective tissue.Specialized muscle fibers in the heart that transmit electrical impulses from the Atrioventricular Node to the Purkinje Fibers are fascicles, also referred to as bundle branches...
, which fill up the groove on either side of the spinous processes of the vertebrae, from the sacrum
Sacrum
In vertebrate anatomy the sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. Its upper part connects with the last lumbar vertebra, and bottom part with the coccyx...
to the axis
Axis (anatomy)
In anatomy, the second cervical vertebra of the spine is named the axis or epistropheus.It forms the pivot upon which the first cervical vertebra , which carries the head, rotates....
. The multifidus is a very thin muscle.
Deep in the spine, it spans three joint segments, and works to stabilize the joints at each segmental level.
The stiffness and stability makes each vertebra work more effectively, and reduces the degeneration of the joint structures.
These fasciculi arise:
- in the sacralSacrumIn vertebrate anatomy the sacrum is a large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity, where it is inserted like a wedge between the two hip bones. Its upper part connects with the last lumbar vertebra, and bottom part with the coccyx...
region: from the back of the sacrum, as low as the fourth sacral foramenSacral foramenSacral foramen can refer to:* Posterior sacral foramina* Anterior sacral foramina...
, from the aponeurosisAponeurosisAponeuroses are layers of flat broad tendons. They have a shiny, whitish-silvery color, are histologically similar to tendons, and are very sparingly supplied with blood vessels and nerves. When dissected, aponeuroses are papery, and peel off by sections...
of origin of the Sacrospinalis, from the medial surface of the posterior superior iliac spinePosterior superior iliac spineThe posterior border of the ala, shorter than the anterior, also presents two projections separated by a notch, the posterior superior iliac spine and the posterior inferior iliac spine. The posterior superior iliac spine serves for the attachment of the oblique portion of the posterior sacroiliac...
, and from the posterior sacroiliac ligaments. - in the lumbarLumbarIn tetrapod anatomy, lumbar is an adjective that means of or pertaining to the abdominal segment of the torso, between the diaphragm and the sacrum ...
region: from all the mamillary processes. - in the thoracic region: from all the transverse processes.
- in the cervicalNeckThe neck is the part of the body, on many terrestrial or secondarily aquatic vertebrates, that distinguishes the head from the torso or trunk. The adjective signifying "of the neck" is cervical .-Boner anatomy: The cervical spine:The cervical portion of the human spine comprises seven boney...
region: from the articular processes of the lower four vertebrae.
Each fasciculus, passing obliquely upward and medialward, is inserted into the whole length of the spinous process
Spinous process
The spinous process of a vertebra is directed backward and downward from the junction of the laminae , and serves for the attachment of muscles and ligaments. In animals without an erect stance, the process points upward and may slant forward or backward...
of one of the vertebræ above.
These fasciculi vary in length: the most superficial, the longest, pass from one vertebra to the third or fourth above; those next in order run from one vertebra to the second or third above; while the deepest connect two contiguous vertebrae.
Multifidus lies deep to the Spinal Erectors, Transverse Abdominus, and Abdominal external oblique muscle
Abdominal external oblique muscle
The external oblique muscle is the largest and the most superficial of the three flat muscles of the lateral anterior abdomen.-Structure:...
/Abdominal external oblique muscle
Abdominal external oblique muscle
The external oblique muscle is the largest and the most superficial of the three flat muscles of the lateral anterior abdomen.-Structure:...
.
