PAS 407- Muscles of the Back UPDATED ACTUAL Questions and CORRECT
Answers
muscles that insert on the ribs and appendicular skeleton
generate movements in upper appendages with no direct
What are extrinsic back muscles?
effect on movements of axial skeleton
innervated by ventral rami of spinal nerves
muscles that insert on the axial skeleton
What are intrinsic muscles? direct effects on movements of the vertebral column
innervated by dorsal rami of spinal nerves
1) trapezius
2) latissimus dorsi
What are the superficial extrinsic muscles? 3) levator scapulae
4) rhomboid major
5) rhomboid minor
1) serratus posterior superior
What are the deep extrinsic muscles?
2) serratus posterior inferior
act on shoulder girdle
What is the general function of the superficial extrinsic
muscles?
move scapula and humerus relative to vertebral column
superiorly: superior nuchal line, external occipital protu-
berance, nuchal ligament
inferiorly: spinous processes C7-T12
Origin of trapezius
,Insertion of trapezius
, lateral 1/3 of clavicle, acromion, and spine of scapula
elevates, retracts, depresses, and rotates scapula
Action of trapezius
accessory nerve
(exception to rule for innervation of extrinsic back mus-
cles)
Innervation of trapezius
transverse cervical and dorsal scapular arteries
Vascular supply of trapezius
pectoral girdle to skull and vertebral column
Answers
muscles that insert on the ribs and appendicular skeleton
generate movements in upper appendages with no direct
What are extrinsic back muscles?
effect on movements of axial skeleton
innervated by ventral rami of spinal nerves
muscles that insert on the axial skeleton
What are intrinsic muscles? direct effects on movements of the vertebral column
innervated by dorsal rami of spinal nerves
1) trapezius
2) latissimus dorsi
What are the superficial extrinsic muscles? 3) levator scapulae
4) rhomboid major
5) rhomboid minor
1) serratus posterior superior
What are the deep extrinsic muscles?
2) serratus posterior inferior
act on shoulder girdle
What is the general function of the superficial extrinsic
muscles?
move scapula and humerus relative to vertebral column
superiorly: superior nuchal line, external occipital protu-
berance, nuchal ligament
inferiorly: spinous processes C7-T12
Origin of trapezius
,Insertion of trapezius
, lateral 1/3 of clavicle, acromion, and spine of scapula
elevates, retracts, depresses, and rotates scapula
Action of trapezius
accessory nerve
(exception to rule for innervation of extrinsic back mus-
cles)
Innervation of trapezius
transverse cervical and dorsal scapular arteries
Vascular supply of trapezius
pectoral girdle to skull and vertebral column
