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Back & Suboccipital Region
insertions, origins, actions, innervations, and blood supply of muscles of the back and suboccipital region
69
Anatomy
Post-Graduate
06/18/2010

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Term
trapezius insertion
Definition

spine of scapula

acromion

lateral third of clavicle

Term
trapezius actions
Definition
elevates retracts and superiorly rotates scapula
Term
trapezius innervation
Definition
spinal accessory n (CN XI) (motor)
c3-c4 ventral rami (sensory)
Term
trapezius origin
Definition
medial third of superior nuchal line
external occipital protuberance
ligamentum nuchae
T1-T12 spinous processes
Term
trapezius blood supply
Definition
transverse cervical a
Term
latissimus dorsi origin
Definition
t7-l5 spinous processes
thoracocolumbar fascia
dorsal sacrum
iliac crest
Term
latissimus dorsi insertion
Definition
fllor of the intertubercular groove of humerus
Term
latissimus dorsi actions
Definition
extends, adducts and medially rotates huerus
(depresses, retracts, and inferiorly rotates scapula)
Term
latissimus dorsi innervation
Definition
thoracodorsal n.
Term
latissimus dorsi blood supply
Definition
thoracodorsal a.
Term
Rhomboid major m. origin
Definition
T2-T5 spinous processes
Term
Rhomboid major m. insertion
Definition
medial border of scapula
Term
Rhomboid major m.actions
Definition
retracts, elevates, and inferiorly rotates scapula
Term
Rhomboid major m. innervation
Definition
dorsal scapular n
Term
Rhomboid major m. blood supply
Definition
dorsal scapular a
Term
Rhomboid minor m. origin
Definition
c7-t1 spinous processes
Term
Rhomboid minor m. insertion
Definition
medial border of scapula superior to rhomboid major
Term
Levator scapulae origin
Definition
c1-c4 transverse processes
Term
Levator scapulae insertion
Definition
superior angle of the scapula
Term
Levator scapulae actions
Definition
protracts, elevates, and inferiorly rotates scapula
Term
Levator scapulae innervation
Definition
dorsal scapular n
ventral rami of c3-c4
Term
Levator scapulae blood supply
Definition
dorsal scauplar a
Term
Serratus posterior superior origin
Definition
c7-t3 spinous processes
Term
Serratus posterior superior insertion
Definition
superior borders of ribs 2-5
Term
Serratus posterior superior actions
Definition
elevates (weakly) ribs 2-5
(accessory musble of respiration)
Term
Serratus posterior superior innervation
Definition
segmentally by thoracic ventral primary rami
Term
Serratus posterior superior blood supply
Definition
brances of posterior intercostal aa
Term
Serratus posterior inferior origin
Definition
t11-l3 spinous processes
Term
Serratus posterior inferior insertion
Definition
inferior borders of ribs 9-12
Term
Serratus posterior inferior actions
Definition
depress (wealky) ribs 9-12
Term
Serratus posterior inferior innervation
Definition
segmentally by thoracic vental primary rami
Term
Serratus posterior inferior blood supply
Definition
brances of posterior intercostal aa
Term
Splenius capitis & cervicis origin
Definition
ligamentum nuchae and t1-t4 spinous processes
Term
Splenius capitis & cervicis insertion
Definition
mastoid process and superior nuchal line (capitus)
c1-c4 transverse processes (cervicus)
Term
Splenius capitis & cervicis actions
Definition
unilateral: lateral flecion and ipsilateral rotation fo head/neck
bilateral: externsion ofhead/neck
Term
Erector spinae muscle group origin
Definition
common tendon or origin from posterior illiac crest, dorsal sacrum and lumbar spinous processes;
Term
Erector spinae muscle group
Definition
iliocostalis m
longissimus m
spinalis m
Term
Iliocostalis m insertion
Definition
angles of ribs, cervical transvese processes
Term
longissimus m insertion
Definition
thoracic transverse processes and adjacent ribs, cervical rtranseverse processes, mastoid process
Term
spinalis insertion
Definition
upper thoracic spinous processes ligmentum nuchar occipital bone b/w nuchal line
Term
Erector spinae muscle group actions
Definition
unilateral: lateral flexion and ipsilateral rotation of trunk and head/neck
bilateral: extension of trunk and head/neck
Term
Transversospinalis group
Definition
semispinalis m
multifidus m
rotatores m
Term
Transversospinalis group origin
Definition
dorsal sacrum and posterior iliar crest
lumbar mamillary processes
cervical and thoracic transverse processes
Term
Transversospinalis group insertioon
Definition
spinous processes and occipital bone
Term
Semispinalis m
Definition
4-6 segments, best defines in cervical region
Term
multifidus m
Definition
2-4 segments, best defines in lumbar region
Term
rotatores m
Definition
1-3 segments, best defined in thoracic region
Term
Transversospinalis group actions
Definition
unilateral: lateral flexion and contralateral rotation of trunk, head and neck
bilateral: extension of trunk, head and neck
Term
Levatores costarum origin
Definition
transverse processes of thoracic vertebrae
Term
Levatores costarum insertion
Definition
superior borders of ribs
Term
Levatores costarum actions
Definition
elevates ribs, assist lateral flexion
Term
intersegmental muscles
Definition
tiny muscles spanning spinous processes (interspinales mm) and transverse processes (intertransverarii mm) of adjacent vert.

largely absent in thoraz

primary funtion: proprioception
Term
thoracocolumbar fascia
Definition
investin fascia of intrinsic muscles in loer thor and lumb reg.
Term
suboccipital muscles: funtion, innervation
Definition
possture and proprioception

suboccipital n
Term
rectus capitis posterior major origin
Definition
spinous process of axis
Term
rectus capitis posterior major insertion
Definition
medial inferior nuchal line
Term
rectus capitis posterior major actions
Definition
extension of head (bilateral)
Term
rectus capitis posterior minor origin
Definition
posterior tubercle of atlas
Term
rectus capitis posterior minor insertion
Definition
inferior nuchal line medial to rectus capitis posterior major
Term
rectus capitis posterior minor actions
Definition
extension of head (bi)
Term
Obliquus capitis superior origin
Definition
spinous process of axis
Term
Obliquus capitis superior inseriton
Definition
occipital bonce betweennichal lines
Term
Obliquus capitis superior actions
Definition
extension of head (bi)
lateral bending of head (uni)
Term
Obliquus capitis inferior origin
Definition
spinous process of axis
Term
Obliquus capitis inferior insertion
Definition
spinous process of atlas
Term
Obliquus capitis inferior actions
Definition
ipsilateral rotation fo head (uni)
Term
borders of the suboccipital triangel
Definition
rectus capitis posterior major
obliquus capitis superior
obliqupus capitis inferior
Term
intrinsic muscles of the back and overlying skin recieve blood primarily from:
Definition
segmental arteries
deep cervical a
verticral a
Term
superficial muscles of the back are supplied by branches of what two arteries?
Definition
subclavian and axillary aa
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