Thoracic spine - origin, insertions and actions Flashcards
what is the origin of the erector spinae - iliocostalis thoracis?
TP of c7
top of lower 6 ribs
what is the insertion of the erector spinae - iliocostalis thoracis?
top of upper 6 ribs
what is the action of the erector spinae - iliocostalis thoracis?
extension and side flexion
what is the origin of the erector spinae - spinalis thoracis?
SP of T11, T12, L1 and L2
what is the insertion of the erector spinae - spinalis thoracis?
SP of T4 - T8
what is the action of the erector spinae - spinalis thoracis?
extension
what is the origin of the erector spinae - longissimus thoracis?
TP of lumbar
what is the insertion of the erector spinae - spinalis thoracis?
TP of thoracic
lower 9 ribs
what is the action of the erector spinae - spinalis thoracis?
extension and side flexion
what is the origin of the semispinalis?
AP of C3 - C6
TP of C7, T1 - T6
what is the insertion of the semispinalis?
nuchal line of occipital bone
what is the action of the semispinalis?
vertebral column extension and draws head backwards
what is the origin of the rotatores?
TP of thoracic spine
what is the insertion of the rotatores?
SP 1-2 levels above its origin
what is the action of the rotatores?
extension and rotation
what is the origin of the rhomboid major and minor?
minor - C7 - T1
major - T2 - T5
what is the insertion of the rhomboid major and minor?
medial border of the scapular
what is the action of the rhomboid major and minor?
retraction of the scapular
what is the origin of the trapezius?
T1 - T12
occipital bone
what is the insertion of the trapezius?
lateral third of clavicle, acromion and spine of the scapular
what is the action of the trapezius?
upper - elevates shoulders and extends the head
middle - retracts shoulders
lower - depresses shoulders
what is the origin of the serratus anterior?
1st - 9th rib
what is the insertion of the serratus anterior?
medial border of the scapular
what is the action of the serratus anterior?
protraction and upwards rotation of the scapular
what is the origin of the serratus posterior inferior?
SP of T11 - L3
what is the insertion of the serratus posterior inferior?
lower 9-12 ribs
what is the action of the serratus posterior inferior?
draws ribs down and back
what is the origin of the serratus posterior superior?
SP of C7 - T3
what is the insertion of the serratus posterior superior?
upper 2-5 ribs
what is the action of the serratus posterior superior?
elevates upper ribs
what is the origin of the pectorals minor?
ribs 3-5
what is the insertion of the pectorals minor?
coracoid process
what is the action of the pectorals minor?
elevates ribs and depresses scapular
what is the origin of the diaphragm?
XP, ribs 7-12 and anterior surface L1 - L3
what is the insertion of the diaphragm?
blends with the Anterior Longitudinal Ligament on the spine
what is the action of the diaphragm?
expands thoracic cavity and compresses abdominal cavity
what is the origin of the internal intercostals?
superior border of ribs 2-12
what is the insertion of the internal intercostals?
inferior border of ribs 2-12
what is the action of the internal intercostals?
depresses ribs and forced expiration
what is the origin of the external intercostals?
lower ribs 1-11
what is the insertion of the external intercostals?
upper borders of ribs 1-11
what is the action of the external intercostals?
elevates ribs and inhalation
