Muscles of the Back Flashcards
What are the main actions of the Erector spinae muscle?
Extends and laterally bends vertebral column and head
What are the main actions of the Interspinales (cervical, thoracic, lumbar) muscle?
Aid in extension of vertebral column
What are the main actions of the Intertransversarii (cervical, thoracic, lumbar) muscle?
Assist in lateral flexion of vertebral column
What are the main actions of the Latissimius dorsi muscle?
Extends, adducts, and medially rotates humerus
What are the main actions of the Levator scapulae muscle?
Elevates scapula medially, inferiorly rotates glenoid fossa
What are the main actions of the Multifidus muscle?
Stabilizes spine
What are the main actions of the Obliquus capitis inferior muscle?
Rotates atlas to turn face to same side
What are the main actions of the Obliquus capitis superior muscle?
Extends and bends head laterally
What are the main actions of the Rectus capitis posterior major muscle?
Extends and rotates head to same side
What are the main actions of the Rectus capitis posterior minor muscle?
Extends head
What are the main actions of the Rhomboid major muscle?
Fixes scapula to thoracic wall and retracts and rotates it to depress glenoid cavity
What are the main actions of the Rhomboid minor muscle?
Fixes scapula to thoracic wall and retracts and rotates it to depress glenoid cavity
What are the main actions of the Rotatores muscle?
Stabilizes, extends, and rotates spine
What are the main actions of the Semispinalis muscle?
Extends head, neck, and thorax and rotates them to opposite side
What are the main actions of the Serratus posterior inferior muscle?
Depresses ribs
What are the main actions of the Serratus posterior superior muscle?
Elevates ribs
What are the main actions of the Splenius capitis muscle?
Bilaterally: extends head Unilaterally: laterally bends (flexes) and rotates face to same side
What are the main actions of the Splenius carvicis muscle?
Bilaterally: extends neck Unilaterally: laterally bends (flexes) and rotates neck toward same side
What are the main actions of the Trapezius muscle?
Elevates, retracts, and rotates scapula; lower fibers depress scapula
What arteries supply the Erector spinae muscle?
Cervical portions: occipital, deep cervical, and vertebral arteries Thoracic portions: dorsal branches of posterior intercostal, subcostal, and lumbar arteries Sacral portions: dorsal branches of lateral sacral arteries
What arteries supply the Interspinales (cervical, thoracic, lumbar) muscle?
Cervical portions: occipital, deep cervical, and vertebral arteries Thoracic portions: dorsal branches of posterior intercostal arteries Lumbar portions: dorsal branches of lumbar arteries
What arteries supply the Intertransversarii (cervical, thoracic, lumbar) muscle?
Cervical portions: occipital, deep cervical, and vertebral arteries Thoracic portions: dorsal branches of posterior intercostal, subcostal, and lumbar arteries Lumbar portions: dorsal branches of lateral lumbar arteries
What arteries supply the Latissimus dorsi muscle?
Thoracodorsal artery, dorsal perforating branches of 9th, 10th, and 11th posterior intercostal, subcostal, and first three lumbar arteries
What arteries supply the Levator scapulae muscle?
Dorsal scapular artery, transverse cervical artery, ascending cervical artery
What arteries supply the Multifidus muscle?
Cervical portions: occipital, deep cervical, and vertebral arteries Thoracic portions: dorsal branches of posterior intercostal, subcostal, and lumbar arteries Sacral portions: dorsal branches of lateral sacral arteries
What arteries supply the Obliquus capitis inferior muscle?
Vertebral artery, descending branch of occipital artery
What arteries supply the Obliquus capitis superior muscle?
Vertebral artery, descending branch of occipital artery
What arteries supply the Rectus capitis posterior major muscle?
Vertebral artery, descending branch of occipital artery
What arteries supply the Rectus capitis posterior minor muscle?
Vertebral artery, descending branch of occipital artery
What arteries supply the Rhomboid major muscle?
Dorsal scapular OR deep branch of transverse cervical artery, dorsal perforating branches of upper five or six posterior intercostal arteries
What arteries supply the Rhomboid minor muscle?
Dorsal scapular OR deep branch of transverse cervical artery, dorsal perforating branches of upper five or six posterior intercostal arteries
What arteries supply the Rotatores muscle?
Dorsal branches of segmental arteries
What arteries supply the Semispinalis muscle?
Cervical portions: occipital, deep cervical, and vertebral arteries Thoracic portions: dorsal branches of posterior intercostal arteries
What arteries supply the Serratus posterior inferior muscle?
Posterior intercostal arteries
What arteries supply the Serratus posterior superior muscle?
Posterior intercostal arteries
What arteries supply the Splenius capitis muscle?
Descending branch of occipital artery, deep cervical artery
What arteries supply the Splenius cervicis muscle?
Descending branch of occipital artery, deep cervical artery
What arteries supply the Trapezius muscle?
Transverse cervical artery, dorsal perforating branches of posterior intercostal arteries
What nerve innervates Erector spine?
Posterior rami of each region
What nerve innervates Interspinales (cervical, thoracic, lumbar)?
Posterior rami of spinal nerves
What nerve innervates Intertransversarii (cervial, thoracic, lumbar)?
Posterior rami of spinal nerves
What nerve innervates Latissimus dorsi?
Thoracodorsal nerve
What nerve innervates Levator scapulae?
Anterior rami of C3–C4 and dorsal scapular nerve
What nerve innervates Multifidus?
Posterior rami of each region
What nerve innervates Obliquus capitis inferior?
Suboccipital nerve
What nerve innervates Obliquus capitis superior?
Suboccipital nerve
What nerve innervates Rectus capitis posterior major?
Suboccipital nerve
What nerve innervates Rectus capitis posterior minor?
Suboccipital nerve
What nerve innervates Rhomboid minor?
Dorsal scapular nerve
What nerve innervates Rhomboid minor?
Dorsal scapular nerve
What nerve innervates Rotatores?
Posterior rami of spinal nerves
What nerve innervates Semispinalis?
Posterior rami of spinal nerves
What nerve innervates Serratus posterior inferior?
Anterior rami of lower thoracic nerves
What nerve innervates Serratus posterior superior?
Anterior rami of upper thoracic nerves
What nerve innervates Splenius capitis?
Posterior rami of middle cervical nerves
What nerve innervates Splenius cervicis?
Posterior rami of lower cervical nerves
What nerve innervates Trapezius?
Accessory nerve (CN XI)
