-
innervation of intrinsic back muscles
posterior primary divisions of spinal nerves
-
O: Lower ligamentum nuchae and SP of upper thoracic (T1-3)
I: Mastoid process and adjacent occipital bone
splenius capitis
-
O: SP of upper thoracic (T1-3)
I: TP of upper cervial (C1-3)
splenius cervicis
-
action of aplenius capitis and cervicis
- acting alone: laterally bend and rotate the neck (turning the face to the same side)
- acting together: draws head back
-
O: iliac crest, sacrum, thoracolumbar fascia
I: angles of lower ribs
Iliocostalis lumborum
-
O: lower ribs
I: angles of upper ribs and TP of C7
Iliocostalis thoracis
-
O: upper ribs
I: TP of mid-cervicals (C4-6)
iliocostalis cervicis
-
O: sacrum, iliac crest, thoracolumbar fascia
I: lower 10 ribs and TP of lumbar and thoracic vertebrae
Longissimus thoracis
-
O: TP upper thoracic vertebrae
I: TP of vervical (up to C2 not including C1)
logissimus cervicis
-
O: TP upper thoracic, articular processes of lower cervical vertebrae
I: mastoid process
longissimus capitis
-
erector spine muscles
- aka sacrocpinalis:
- iliocostalis, longissimus, spinalis
-
action of erectors
- muscles acting bilaterally extend column,
- muscles acting on 1 side bend column laterally,
- longissimus capitis extends head and turns face to the same side
-
O: SP lower thoracic vertebrae
I: SP upper thoracic vertebrae
spinalis thoracis
-
often only scant fibers
spinalis cervicis
-
now considered part of semispinalis capitis
spinalis capitis
-
muscles in the transversospinal muscle group
rotators, multifidi, and smispinalis muscles
-
O: TP
I: SP of vertebrae one segment above orgine
short rotators
-
O: TP
I: SP of vertebrae two segments above origin
long rotator
-
O: TP
I: SP of vertebrae two to five segments above origin
multifidus
-
O: TP
I: SP of upper thoracic vertebrae (T1-4)
semispinalis thoracis
-
O: TP
I: SP of cervical vertebrae up to C2
semispinalis cervicis
-
O: TP
I: occipital bone
semispinalis capitis
-
actio nof transversospinous muscles
extend column and rotate it to the opposiite side
-
between the SP of adjacent vertebrae- bst developed in cervical region- absent in thoracic area
interspinalis
-
action interspinalis
extend the vertebral column
-
between the TP of adjacent vertebrae- best developed in cervical region- absent in most of the thoracic region
intertransversarii
-
action of intertransversarii
extend column and bend toward the same side
-
suboccipital muscles
rectus capitis posterior major/minor and obliquus capitis inferior/superior
-
origin of rectus capitis posterior major
SP of C2
-
origin of rectus capitis posterior minor
posterior tubercle of C1
-
INSERTION of rectus capitis posterior majoR
occipital bone, inferior to inferior nuchal line
-
insertion of rectus capitis posterior minor
occipicatl bone, immediately medial to rectus capitis posterior major
-
origin of obliquus capitis inferior
SP C2
-
origin of obliquus capitis superior
TP C1
-
insertion of obliquus capitis inferior
TP C1
-
insertion of obliquus capitis superior
occipital bone, near inferior nuchal line
-
action of suboccipital muscles
extend and rotate the head to the same side
-
innervation of suboccipital muscles
suboccipital n (which is the posterior primary divison of C1)
-
suboccipital triangle
obliquus capitis superior/inferior and rectus capitis posterior major
-
structures within the subossipital triangle
suboccipital nerve and vertebral artery
|
|
