Muscles of the back Flashcards
Describe the attachments of trapezius
medially
- base of skull
- medial 1/3 superior nuchal line
- nuchal ligament
laterally
- lateral clavicle
- acromion
- spine of scapula
Describe the actions of trapezius
rotation of scapula to allow for greater abduction of upper limb
retraction of scapula
Describe the attachments of latissimus dorsi
spinous processes T7-12, thoracolumbar fascia, iliac crest and lower 3/4 ribs
to
edge of bicipital groove of humerus
Describe the actions of latissimus dorsi
adduction, medial rotation and extension of arm
Describe the innervation to latissimus dorsi
thoracodorsal nerve C6-8
Where does rhomboid major insert
from spinal processes T2-5 to medial border of scapula
Describe the innervation to rhomboids
dorsal scapular nerve C4,5
Describe the attachments of rhomboid minor
nuchal ligament, C7-T1 to medial end of spine of scapula
Describe the attachments of levator scapulae
posterior tubercles transverse process C1-4 to medial border of scapula above spine
Describe the innervation to levator scapula
C3, C4 and dorsal scapular nerve C4,5
Describe the attachments of serratus posterior superior
nuchal ligament, spinous processes C7-T3
to
superior border ribs 2-4
describe the action of serratus posterior superior
elevate ribs 2-5
Describe the innervation to serratus posterior superior
ant rami T2-5
Describe the attachments of serratus posterior inferior
spinous processes T11-L2
to
inferior borders ribs 8-12 near angle
Describe the action of serratus posterior inferior
depress ribs 9-12
Describe the innervation to serratus posterior inferior
Anterior rami T9-12
Describe the innervation to intrinsic muscles of the back - general
posterior rami of spinal nerves
Which muscles are superficial intrinsic back muscles
splenius capitis and cervicis
Describe the attachments of splenius capitis and cervicis
nuchal ligament and spinous processes C7-T3/4
to
capitis - mastoid process
cervicis - tubercles of T processes C1-3/4
Describe the action of splenius’s
Extend and rotate the head
What muscle group makes up the intermediate intrinsic back muscles
erector spinae
What 3 muscles make up erector spinae
iliocostalis
longissimus
spinalis
Describe the attachments of iliocostalis
angle of ribs and cervical transverse processes
to
iliac crest
Describe the attachments of spinalis
upper thoracic spinous processes and cranium
What muscles are the deep intrinsic back muscles
semispinalis
multifidus
rotatores
levator costarum
interspinale
intertransversi
Describe the actions of multifidus
extension, lateral flexion and rotation of spine
Where is rotartores most developed
thoracic region
Describe the insertion of interspinale
to spinous process of above vertebrae
Describe the action of inetrspinale
extension of C spine
stabilises C spine
maintains posture
Describe the innervation of multifidus, rotatores and interspinale
medial branches of posterior division of spinal nerves
Describe the attachments of levator costarum
transverse process C7-T11
to
rib below
Describe the action of levator costarum
elevates ribs during inspiration
rotates and laterally flexes the vertebrae
Describe the insertion of intertransversarii
anterior tubercle of t process of adjacent vertebrae
Describe the action of intertransversarii
lateral flexion
stabilise adjacent vertebrae during large spinal movements
Describe the innervation to intertransversarii
lumbar posterior primary divisions
