Upload
nitin-sharma
View
219
Download
0
Embed Size (px)
Citation preview
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 1/25
DEEP BACK MUSCLES
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 2/25
Deep Back Muscles
Epaxial muscles.
Hypaxial muscles.
Pharyngeal arch muscles.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 3/25
Cutaneous Nerves of the Back
Along either side of the midline of theback:
Innervated by dorsal (posterior) rami ofthoracic spinal nerves.
More laterally:
Innervated by lateral cutaneous branches of
the intercostal nerves.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 4/25
Thoracolumbar Fascia
Triangular-shaped sheet of toughconnective tissue.
Partial site of origin of latissimus dorsi andabdominal oblique muscles.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 5/25
Thoracolumbar Fascia Laminae
Posterior lamina to lumbar spinousprocesses.
Middle lamina to lumbar transverseprocesses.
Anterior lamina (deepest) to lumbartransverse processes.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 6/25
Arrangement of Back Muscles
Three groups:
Superficial:
Extrinsic.
Intermediate:
Extrinsic.
Deep:
Intrinsic.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 7/25
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 8/25
Superficial Extrinsic Muscles
Connect limb to axial skeleton.
Innervated by ventral rami or CN XI.
Include:Trapezius.
Latissimus dorsi.
Levator scapulae.Rhomboideus major.
Rhomboideus minor.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 9/25
Intermediate Extrinsic Muscles
Respiratory muscles.
Innervated by ventral (anterior) rami.
Serratus posterior group:Serratus posterior superior.
Serratus posterior inferior.
Refer to Syllabus: Table II, p. 71.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 10/25
INTRINSIC (DEEP) BACK
MUSCLES
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 11/25
Intrinsic Back Muscles
True intrinsic muscles of the back areinnervated by dorsal (posterior) rami.
Three groups:
Superficial
Intermediate
Deep
Refer to Table III, p 73 of Syllabus.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 12/25
Spinotransversalis System
Consists of the Splenius group:
Long muscles.
Originate from ligamentum nuchae andspinous processes.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 13/25
Spinotransversalis System
Run laterally upward to transverseprocesses and skull.
Run laterally and upward to insertion.
Two parts:
Splenius capitis.
Splenius cervicis.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 14/25
Superficial Intrinsic Muscles
Splenius capitis:
O: spinous processes of C7 and T1-4.
I: superior nuchal line and mastoid.
Splenius cervicis:
O: spinous processes of T3-6.
I: C1-C4 transverse processes withlevator scapulae.
Spinotransversalis System
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 15/25
Intermediate Intrinsic
Sacrospinalis system:
Erector spinae.
Run longitudinally upward:
Transverse processes to rib.
Rib to rib.
Rib to cervical transverse processes.
Spinous processes to spinous processes.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 16/25
Intermediate Layer of Intrinsic Deep Back Muscles
Components:
Iliocostalis.
Longissimus.
Spinalis.
Refer to Syllabus:
Table III.
P 73.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 17/25
Intermediate Intrinsic
Iliocostalis:
Origin = ilium and sacrum.
Insertion = most of the ribs.
Lateral part of the erector spinae group.
Extends back; keeps erect posture.
Components:
Lumborum.
Thoracis.
Cervicis.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 18/25
Intermediate Intrinsic
Longissimus:
Origin = transversus processes andsacrum.
Insertion = most of ribs.
Middle portion of erector spinae group.
Components:
Thoracis.
Cervicis.
Capitis.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 19/25
Intermediate Intrinsic
Spinalis:Origin = spinous processes of T11-L2.
Insertion = spinous processes of thoracic
and lower cervical vertebrae.Components:
Thoracis.
Cervicis:
Usually absent.
Capitis:Part of semispinalis capitis.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 20/25
Deep Intrinsic Muscles
Transversospinalis system:From transverse processes to transverseprocesses.
Concealed by erector spinae.Muscles arise laterally and insert medially.
Components:Semispinalis.
Multifidus.
Rotatores.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 21/25
Semispinalis
Traverse a couple of vertebral levels.
Components:
Thoracis.
Cervicis.
Origin = T1-4.
Insertion = C3-5.
Largely covered by semispinalis capitis.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 22/25
Semispinalis
Components:
Capitis:
Origin = T1-6 and C4-7.
Insertion = between superior and inferiornuchal lines.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 23/25
Multifidus
Thick muscle mass.
Arises from sacrum and surroundingstructures and from transverse processesup to C4.
Including mammillary processes of lumbarvertebrae.
Traverses 3 segments.
Inserts on spinous processes C2-L5.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 24/25
Rotatores
Pass from root of transverse process toroot of superior spinous process.
Long:
Span two segments.
Short:
Span one segment.
8/2/2019 KUMC 09 Deep Back Muscles Student
http://slidepdf.com/reader/full/kumc-09-deep-back-muscles-student 25/25
Intrinsic Segmental Muscles
Interspinales.
Intertransversarii.