Summary muscles of the back

Muscles Of The Back

Name. Position. Origin. Insertion. Action. Nerve Supply.
Lies Lower part
obliquely on ligamentum
Draws lower
Rhomboid back from nuchae,
Root of spine angle of Fifth
last cervical seventh Second
of scapula. scapula back cervical.
minor vertebra to cervical and
and up.
root of first dorsal
scapula. spines.
Vertebral
Four or five
Immediately border Draws lower
Rhomboid upper dorsal
below scapula border of Fifth
spines, supra Layer
rhomboid between scapula back cervical.
major - spinous
minor. spine and and up.
ligament.
lower angle.
(1) Mastoid
process,
Lower half Posterior
ridge of
Back of neck ligamentum (1) Draws primary
Splenius : (1) occiput. (2)
and upper nuchae, last head back. (2) branch
Capitis. (2) Transverse Third
part of dorsal cervical and Keeps neck cervical
Collis. processes
region. six upper erect. and
three upper
dorsal spines dorsal.
cervical
vertebrae.
Last cervical,
Second,
two upper
third, fourth, Posterior
Serratus dorsal
Upper part of and fifth ribs Raises ribs in primary
posterior spines, lower Layer
back. beyond inspiration. branch
superior. part
dorsal.
ligamentum
angles.
nuchae.
junction of Two last Posterior
Serratus Four lower Draws ribs
dorsal and dorsal, two primary Third
posterior ribs beyond down in
lumbar upper lumbar branch Layer
inferior. angles. expiration.
regions. spines. dorsal.
Crest of
ilium,
Divides at
Erector From the posterior Posterior
last rib into
spinae ; lower part of iliac spines, Keeps spine primary Third
outer and
divides into sacrum to the sacral, erect. branch layer
middle
seven parts. cranium. lumbar, & sacral.
column.
three dorsal
spines.
a. Ilio-costalis Lower six or Outer Six or seven Keeps spine Posterior Fourth