Extrinsic Back Muscle POINA's Flashcards
Purposeful Activity of Latissimus Dorsi
-Propelling a manual wheelchair forward
-Using arms to help stand up from sitting
Origin of Latissimus Dorsi
Spinal Processes T 7-12
Thoracolumbar fascia
Iliac Crest
Ribs 9-12 or 10-12
7% of people have attachment to inferior angle of scapula
Insertion of Latissimus Dorsi
Floor of intertubercular sulcus of humerus
Action of Latissimus Dorsi
-Shoulder extension
-Shoulder internal rotation
-Shoulder adduction
Nerve innervation of Latissimus Dorsi
Thoracodorsal nerve
C6, C7, and C8
Purposeful Activity of Upper Trapezius
-Reaching for something overhead
Origin of Upper Trapezius
-Spinous processes of C7-T12
-External occipital protuberance
-Occiput’s Superior Nuchal Line
-Ligamentum nuchae
Insertion of Upper Trapezius
-Lateral 1/3 of clavicle
-Acromion of scapula
-Distal spine of scapula
Nerve Innervation of Upper Trapezius
-Spinal Accessory Nerve for motor (CN XI)
-Ventral rami for pain and proprioception (C3 and C4)
Action of Upper Trapezius
Bilaterally
-Head/neck extension
Unilaterally:
-Head/neck Ipsilateral lateral flexion
-Head/neck contralateral rotation
-Scapular Elevation
-Scapular Upward Rotation
Purposeful Activity of Middle Trapezius
Rowing a kayak
Origin of Middle Trapezius
-Spinous processes of C7-T12
-External occipital protuberance
-Occiput’s Superior Nuchal Line
-ligamentum nuchae
Insertion of Middle Trapezius
-Lateral 1/3 of clavicle
-Acromion of scapula
-Middle spine of scapula
Nerve Innervation of Middle Trapezius
-Spinal Accessory Nerve for motor (CN XI)
-Ventral rami for pain and proprioception (C3 and C4)
Action of Middle Trapezius
-Scapular Adduction/Retraction
-Scapular stabilization
Purposeful Activity of Lower Trapezius
Reaching Overhead
Origin of Lower Trapezius
-Spinous processes of C7-T12
-External occipital protuberance
-Occiput’s Superior Nuchal Line
-ligamentum nuchae
Insertion of Lower Trapezius
-Lateral 1/3 of clavicle
-Acromion of scapula
-Medial spine of scapula
Nerve Innervation of Lower Trapezius
-Spinal Accessory Nerve for motor (CN XI)
-Ventral rami for pain and proprioception (C3 and C4)
Action of Lower Trapezius
-Scapular Depression
-Scapular Upward Rotation
Purposeful Activity of Levator Scapulae
-Carrying a briefcase/Farmers Carry
-Shrugging shoulders for communication
Origin of Levator Scapulae
Posterior tubercles of transverse processes of C1-C4
Insertion of Levator Scapulae
-Medial border of scapula between superior angle and inferior angle (root) of scapular spine (basically top medial of scapula)
Nerve Innervation of Levator Scapulae
-Cervical Nerves C3 and C4
-Dorsal Scapular Nerve C4 and C5
Action of Levator Scapulae
-Scapular Elevation
-Scapular Downward Rotation
Purposeful Activity of Rhomboid Major and Minor
Reaching into a back pocket
Origin of Rhomboid Major
Spinal Processes T2-T5
Insertion of Rhomboid Major
Medial border of scapula between scapular spine and inferior angle
Nerve Innervation of Rhomboid Major
Dorsal Scapular Nerve C4 and C5
Action of Rhomboid Major
-Scapular Adduction/Retraction
-Scapular Downward Rotation
-Fixes scapula to thoracic wall
Origin of Rhomboid Minor
-Ligamentum Nuchae
-Spinal Processes C7-T1
Insertion of Rhomboid Minor
Medial border of scapular spine
Nerve Innervation of Rhomboid Minor
Dorsal Scapular Nerve C4 and C5
Action of Rhomboid Minor
-Scapular adduction/retraction
-Scapular downward rotation
-Fixes scapula to thoracic wall
Origin of Serratus Posterior Superior
SP C7-T3
Just know where it is!
Nerve Innervation of Serratus Posterior Superior
Ventral rami
Action of Serratus Posterior Superior
Forced breathing. Rib ELEVATION with inhalation
Origin of Serratus Posterior Inferior
SP T12-L3
Just know where it is!
Nerve Innervation of Serratus Posterior Inferior
Ventral Rami
Action of Serratus Posterior Inferior
Forced breathing, rib DEPRESSION with exhalation
