Muscles of the Back Flashcards
What are the attachments, actions and innervation of rhomboid major?
Origin - spinous processes of T2-T5
Insertion - medial border of scapula (between spine and inferior angle)
Actions - retracts and rotates scapula
Innervation - dorsal scapular nerve
What are the attachments, actions and innervation of rhomboid minor?
Origin - spinous processes of C7-T1
Insertion - medial border of scapula (at level of spine)
Actions - retracts and rotates scapula
Innervation - dorsal scapular nerve
What are the attachments, actions and innervation of levator scapulae?
Origin - transverse processes of C1-C4
Insertion - medial border of scapula
Actions - elevates scapula
Innervation - dorsal scapula nerve
What are the attachments, actions and innervation of trapezius?
Origin - skull, ligamentum nuchae, spinous processes of C7-T12
Insertion - clavicle, acromion, spine of scapula
Actions
- Upper - elevate scapula and rotates during abduction of arm
- Middle - retracts scapula
- Lower - depress scapula
Innervation - accessory nerve
What are the attachments, actions and innervation of latissimus dorsi?
Origin - spinous processes of T6-T12, iliac crest, thoracolumbar fascia and inferior 3 ribs
Insertion - intertubercular sulcus of humerus
Actions - extends, adducts and medially rotates upper limb
Innervation - thoracodorsal nerve
What are the attachments of serratus posterior superior?
Origin - lower part of ligamentum nuchae, spinous processes of C7-T3
Insertion - ribs 2-5
What is the action of serratus posterior superior?
Elevates ribs 2-5
What are the attachments of serratus posterior inferior?
Origin - spinous processes of T11-L3
Insertion - ribs 9-12
What is the action of serratus posterior inferior?
Depresses ribs 9-12
What is the innervation of serratus posterior superior and inferior?
Intercostal nerves
What are the superficial intrinsic muscles of the back?
Splenius capitus and splenius cervicis
What are the attachments of splenius capitus?
Origin - ligamentum nuchae, spinous processes of C7-T3
Insertion - mastoid process and occipital bone
What are the attachments of splenius cervicis?
Origin - spinous processes of T3-T6
Insertion - transverse processes of C1-C3
What are the actions of splenius muscles?
Extend, rotate and laterally flex the head
What innervates splenius capitus?
Posterior rami of C3/C4
