Everything about the Longissimus totally explained
The
longissimus is the muscle lateral to the
semispinalis. It is the longest subdivision of the
sacrospinalis that extends forward into the
transverse processes of the posterior
cervical vertebrae.
Longissimus dorsi
The
Longissimus dorsi is the intermediate and largest of the continuations of the Sacrospinalis.
In the
lumbar region, where it's as yet blended with the
Iliocostalis lumborum, 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 vertebræ, and to the anterior layer of the
lumbodorsal fascia.
In the
thoracic region it's inserted, by rounded tendons, into the tips of the transverse processes of all the thoracic vertebræ, and by fleshy processes into the lower nine or ten
ribs between their
tubercles and angles.
Longissimus cervicis
The
Longissimus cervicis (
Transversalis cervicis), situated medial to the
Longissimus dorsi, arises by long thin tendons from the summits of the transverse processes of the upper four or five thoracic vertebræ, and is inserted by similar tendons into the posterior tubercles of the transverse processes of the
cervical vertebrae from the second to the sixth inclusive.
Longissimus capitis
The
Longissimus capitis (
Trachelomastoid muscle) lies medial to the
Longissimus cervicis, between it and the
Semispinalis capitis.
It arises by tendons from the transverse processes of the upper four or five thoracic vertebræ, and the
articular processes of the lower three or four cervical vertebrae, and is inserted into the posterior margin of the
mastoid process, beneath the
Splenius capitis and
Sternocleidomastoideus.
It is almost always crossed by a tendinous intersection near its insertion.
Further Information
Get more info on 'Longissimus'.
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