A manual of anatomy . Dorsal scapular nerve of the brachial plexus(fifth cer.). THIRD LAYER The m. serratus posticus superior arises from the ligamentumnuchas and the spines of the seventh cervical and first three thoracicvertebrae. It is inserted into the second, third, fourth and fifthribs. The m. serratus posticus inferior arises from the lumbosacral THE MUSCLES OF THE BACK 163 fascia attached to the last two thoracic and first two lumbar spines;after a horizontal course it is inserted into the last four ribs. Actions.—Extensors of the vertebral column and accessory jmisclesof respiration.
A manual of anatomy . Dorsal scapular nerve of the brachial plexus(fifth cer.). THIRD LAYER The m. serratus posticus superior arises from the ligamentumnuchas and the spines of the seventh cervical and first three thoracicvertebrae. It is inserted into the second, third, fourth and fifthribs. The m. serratus posticus inferior arises from the lumbosacral THE MUSCLES OF THE BACK 163 fascia attached to the last two thoracic and first two lumbar spines;after a horizontal course it is inserted into the last four ribs. Actions.—Extensors of the vertebral column and accessory jmisclesof respiration. Nerve Supply.—Dorsal rami of the superior and inferior thoracicnerves, respectively. The m. splenius is a band-like muscle that arises from the , the last cervical and the first six thoracic spines and the Splenius capit/s Levator scapulae \\tjfihomboideus minor(Supraspinatus) fihomboideusmajor OccipitalisSemispinalis capitisSternocleidomastotdeusSplenius cervicisLevator scapulaeTrapezius x Rbomtjoidei X. Latissimus X(Sacrospinahs) Serratus posterior inferior Lumbodorsal fascia (posterior layer) Gluieatfascia Obliquusabdominis interrus {Glutaeus medius)(6/utaeus maximus) Fig. 128.—The deeper layers of the flat muscles of the back. On the left side the trape-zius and latissimus have been cut away; on the right side the rhomboidei have also been cutand reflected and the lumbodorsal fascia has been retained only where it is in relation withthe origin of the serratus posterior inferior and below. {SohoUa and McMurrich.) supraspinous ligaments. The superior portion is inserted, as thesplenius capitis into the mastoid process and the superior nuchal inferior portion, as the splenius cervicis, is inserted into dorsaltubercles of the first three or four cervical vertebrae. Actions .—Extension and lateral movement of the vertebral splenius capitis assists in flexion, rotation and raising the head. 164 MYOLOGY Nerve -Dorsal rami of t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
