Deep back muscles Flashcards
Splenius cervicis attachment
spinous process of T3-6 to transverse process of C1-3
Splenius cervicis innervation
dorsal rami of mid cervical nerves
Splenius capitis attachment
spinous process of C7-T4 and lower ligamentum nuchae TO lateral 3rd superior nuchal line on occiput and mastoid process on temporal bone
Splenius capitis innervation
dorsal rami of lower cervical nerves
Splenius cervicis and splenius capitis action
extensors of head and neck when contracted bilat, rotators of head and neck with unilateral contraction
Spinotransveralis group
splenius cervicis and splenius capitis
Erector spinae muscles
iliocostalis, longissimus, and spinalis
individual fibers spanning 6-10 vertebral levels all from common tendon
Iliocostalis lumborum attachment
common tendon to the angle of lower 7 ribs
Iliocostalis thoracis attachment
angle of lower 6 ribs to angle of upper 6 ribs and transverse process of C7
Iliocostalis cervicis attachment
angle of ribs 3-6 to transverse processes of C4-6
Longissimus capitis attachment
transverse processes of C4-T5 and articular processes of lower 4 cervical vertebrae to mastoid process
Longissimus cervicis attachment
transverse processes of T1-5 to transverse processes of C2-6
Longissimus thoracis attachment
common tendon and transverse processes of all lumbar vertebrae to transverse processes of all throacic vertebrae and ribs 2-12
Spinalis thoracis attachment
spinous processes of T10-L3 to spinous processes of T1-8
Spinalis cervicis and spinalis capitis attachment
lower ligamentum nuchae and spinous process of C7 to spinous process of C2
Erector spinae muscles innervation
dorsal rami of each region
Erector spinae muscles action
extend back and neck when contracting bilat
laterally flex back when contracted unilaterally
Transversospinalis group
semispinalis, multifidus, and rotatores
Semispinalis thoracis attachment
transverse process of T6-T10 to spinous process of C5-T4
Semispinalis cervicis attachment
transverse process of T1-8 to spinous process of C2-5
Semispinalis capitis attachment
transverse process of T6-C7, and articular processes of C4-6 TO occipital bone between inferior and superior nuchal lines
Semispinalis action
extension of the neck and rotation of head
Multifidus (span 2-4 levels) attachment
sacrum, PSIS, mammillary processes of the lumbar vertebrae, transverse processes of the thoracic vertebrea, and articular processes of lower 4 cervical vertebrae TO base of the spinous processes of all vertebra L5-C2 (most prominent in the lumbar region)
Multifidus action
stabilization of vertebral column
Rotatores longi attachment
transverse processes to the spinous process of segment two levels higher (most pronounced in the thoracic region but present over entire spine)
Rotatores brevis attachment
transverse processes to the spinous process of one level higher
Rotatores action
stabilizes, extends, and rotates spine
Transversospinalis group innervation
dorsal rami of the spinal nerves
suboccipital muscles
obliquus capitis and rectus capitis posterior
Obliquus capitis inferior attachent
spinous process of C2 to transverse process of C1
Obliquus capitis inferior action
unilateral contraction rotates head to same side
Obliquus capitis superior attachment
transverse process of C1 to occipital bone above inferior nuchal line
Rectus capitis posterior major attachment
spinous process of C2 to occipital bone below inferior nuchal line
Obliquus capitis superior and Rectus capitis posterior major action
bilateral contraction extends head, unilateral to bend head to same side
Rectus capitis posterior minor attachment
posterior tubercle of C1 to occipital bone below inferior nuchal line superolaterally
Rectus capitis posterior minor action
bilateral to contribute to head extension
