Lecture 15: Deep back muscles Flashcards
Thoracolumbar fascia posterior lamina attaches
To the lumbar spinous process
Deep intrinsic muscle groups
Spinotransversalis
Erector spinae complex/sacrospinalis
Transversospinalis group
Epaxial muscles
Spinalis
Longissimus
Iliocostalis
Superficial extrinsic back muscles include, what is function
Connect limb to axial skeleton Trapezius Latissimus dorsi Levator scapulae Rhom major Rhom minor
Transversospinalis system runs from, concealed by, arise
Transverse processes to transverse processes
Concealed by erector spinae
Muscles arise laterally and insert medially
Intrinsic segmental muscles
Interspinales
Intertransversarii
Multifidus origin/insertion
O-From sacrum and surround structures and from transverse processes up to C4, including mammillary processes of lumbar vertebrae
I- On spinous processes C2-L5
Traverses 3 segments
Thoracolumbar fascia anterior lamina attaches
To lumbar transverse processes
Deep intrinsic superficial muscles
Splenius capitis
Splenius cervicis
Intermediate extrinsic back muscles function, include
Respiratory muscles
Serratus posterior superior
Serratus posterior inferior
Skin on either side of midline of back innervation
Dorsal rami of thoracic spinal nerves
Serratus posterior inferior action/innervation
Pull lower ribs inferiorly and counteracts diaphragm
Ventral rami of intercostals T9-12
Transversospinalis muscles attach, include, type of muscle
Run laterally and insert medially. Run from transverse process to transverse process Semispinalis Multifidus Rotatores Deep intrinsic muscles
Spinotransversalis muscles attach, include, type of muscle
Run laterally and upward to attach to transverse processes and skull
Splenius capitis
Splenius cervicis
Superficial extrinsic muscle
Deep intrinsic deep back muscles include, system
Semispinalis
Multifidus
Rotatores
Transversospinalis system
Splenius capitis attachment
O- Spinous processes of C7 and T1-4
I- superior nuchal line and mastoid
Lateral back skin innervation
Lateral cutaneous branches of the intercostal nerves
Splenius cervicis attachment
O- Spinous processes of T3-6
I- C1-C4 transverse processes w/levator scapulae
Splenius muscle group origin, fun fact
Ligamentum nuchae and spinous processes
These are the most superficial muscles of the neck
Spinalis attachment
O- Spinous processes of T11-12
I- Spinous processes of thoracic and lower cervical vertebrae
Iliocostalis Location, function, attachments
Lateral part of erector spinae group
Extends back, keeps erect posture
O- ilium and sacrum
I- most of the ribs
Serratus posterior superior origin/insertion
O- Ligamentum nuchae; spinous processes of C7 and T1-2/3
I- Ribs 2-5
Sacrospinalis/erector spinae muscles attach, include, type of muscle
Run longitudinally upward and attach to transverse processes, ribs, and spinous processes Iliocostalis Longissimus Spinalis Intermediate intrinsic muscle
Deep intrinsic intermediate muscles include, system
Iliocostalis
Longissimus
Spinalis
Sacrospinalis group
Hypaxial muscles
Quadratus Lumborum External/internal oblique Transversus Rectus abdominus
Rotatores location, long vs short rotatores
Pass from root of transverse process to root of superior spinous process
Long rotatores- spans 2 segments
Short rotatores- spans 1 segment
Thoracolumbar fascia middle lamina attaches
To lumbar transverse processes
Multifidus description
Thick muscle mass
Best seen in region of sacrum
Semispinalis location, components
Traverse a couple of vertebral levels
Thoracic
Cervicis
Capitis
True intrinsic back muscle innervation
Dorsal rami
Longissimus location, attachments
Middle portion of erector spinae group
O- Transversus processes and sacrum
I- Most of ribs
Serratus posterior inferior origin/insertion
O- Spinous processes of T11-12 and L1
I- Ribs 10/9-12
Serratus posterior superior action/innervation
Elevate upper ribs during inspiration
Ventral rami of intercostals T1-3(4)
