Back Muscles Flashcards
Trapezius Origin
Medial 1/3 nuchal line and spinous process of C7-T12
Trapezius Insertion
Lateral 1/3 of clavicle, acromion, scapular spine
Trapezius Arterial supply
Transverse cervical A.
Trapezius Innervation
Spinal accessory nerve & C3/C4 nerves
Trapezius Function
Elevates, depresses & retracts scapula. Fixes scapula to thoracic wall. Unilaterally flexes neck ipsilaterally.
Latissimus Dorsi Origin
Spinous process of T7-T12, inferior angle of scapula.
Latissimus Dorsi insertion
Floor of intertubercular groove of humerus
Latissimus Dorsi Innveration
C6-C8 spinal nerves (thoracodorsal nerve)
Latissimus Dorsi Arterial supply
Thoracodorsal A.
Latissimus Dorsi Function
Extends, abducts and medially rotates shoulder. Brings body to arms when extended superiorly
Levator Scapulae Origin
C1-C4 transverse processes.
Levator scapulae attachment
Superior angle of scapula
Levator Scapulae Innervation
C3-C5 spinal nerves (C5 dorsal scapular nerve)
Levator Scapulae arterial supply
Dorsal Scapular A.
Levator Scapulae Function
Elevates scapula, laterally flexes neck ipsilaterally.
Rhomboid Major Origin
Spinous process of T2-T5.
Rhomboid Major insertion
Medial border of scapula below scapula spine
Rhomboid major innervation
Dorsal scapular nerve (C5)
Rhomboid major arterial supply
Dorsal Scapular A.
Rhomboid major Function
Retracts scapula & steadies scapula to thoracic wall.
Rhomboid minor Origin
Nuchal ligament & C7-T1 spinous processes
Rhomboid minor Insertion
Medial border of scapulae at scapula spine
Rhomboid Minor Innervation
Dorsal scapular nerve (C5)
Rhomboid minor Arterial supply
Dorsal scapular A.
Rhomboid Minor Functions
Elevates & steadies the scapula & ipsilaterally inclines neck.
Serratus Posterior superior Origin
Spinous processes of C7-T3
Serratus Posterior superior Insertion
Ribs 2-4
Serratus posterior superior innervation
Anterior rami of T2-T5
Serratus posterior superior Arterial supply
Inter coastal A.
Serratus posterior superior function
Proprioception
Serratus posterior inferior Origin
spinous processes of T11-L2
Serratus posterior inferior insertion
Ribs 8-12
Serratus posterior inferior innervation
Anterior rami of T9-T12
Serratus posterior inferior arterial supply
Intercostal, subcoastal and lumbar Arteries
Serratus posterior inferior Function
Proprioception
Spinotransversales muscle names
Splenius cervicis & Splenius capitis
Splenius cervicis origin
Spinous processes of T3-T6
Splenius cervicis insertion
Transverse processes of C1-C3
Splenius Capitis Origin
Spinous processes of C7-T4
Splenius capitis insertion
Mastoid process and superior nuchal line
Spinotransversales innervation
Posterior rami of spinal nerves
Spinotransversales Arterial supply
Occipital & transverse cervical artery
Spinotransversales functions
Bilaterally extends neck, ipsilaterally flexes and rotates neck
Erector spinae muscle names
Illiocostalis, Longissimus, Spinallis
Illicostalis origin
Broad tendon of iliac crest & lumbar spinous processes
Illiocostalis Insertion
Lower rib angles and cervical transverse processes
Illiocostalis innervation
Posterior rami of spinal nerves.
Illiocostalis Artery supply
Deep cervical, intercostal, subcostal and lumbar A.
Illiocostals Function
Bilaterally extends spine, ipsilaterally laterally flexes spine.
Longissimus origin
Broad tendon of illiac crest and lumbar spinous processes
Longissimus Insertion
Thoracic and cervical transverse processes (thoarcis and cervicis) and mastoid processes (capitis)
Longissimus innervation
Posterior rami of spinal nerves
Longissimus Arterial supply
Deep cervical, intercostal, subcostal and lumbar A.
Longissimus Function
Bilaterally extends spine & head, ipsilaterally laterally flexes spine & head
Spinallis Origin
Broad tendon of illiac crest.
Spinallis Insertion
Spinous processes in thoracic and cervical vertebrae
Spinallis innervation
Posterior rami of spinal nerves
Spinallis Arterial supply
Deep cervical, intercoastal, subcostal and lumbar A.
Spinallis Function
Bilaterally extends spine, ipsilaterally laterally flexes spine.
Transversospinales muscle names
Semispinalis, multifidus, Rotatores longus & Brevis
Semispinalis Origin
Transverse processes of C4-T12.
Semispinalis insertion
occipital bone, spinous processes of cervical and thoracic vertebrae
Semispinalis Arterial supply
Deep cervical, intercoastal, subcostal & lumbar A.
Semispinalis Function
Bilaterally extends head & spine, ipsilaterally flexes spine and contralaterally rotates spine
Multifidus Origin
Sacrum, ilium, transverse processes of T1-T3 & L2-L5. Articular processes of C4-C7
Multifidus insertion
Spinous processes of superior vertebrae.
Multifidus Innervation
Posterior rami of spinal nerves
Multifidus Arterial supply
Deep cervical, intercostal, subcostal and lumber A.
Multifidus Function
Bilaterally extends spine, Ipsilaterally flexes spine.
Rotatores origin
Transverse process of T1-T12
Rotatores insertion
Spinous process of superior vertebrae
Rotatores innervation
Posterior rami of spinal nerves
Rotatores arterial supply
Deep cervical, intercostal, subcostal, lumbar A.
Rotatores function
Bilaterally extends spine, contralateral rotation of spine. Proprioception.
Interspinales origin & insertion
Moves through C1-L5.
Origin = spinous processes of superior vertebrae. Insertion = spinous processes of inferior vertebrae.
Interspinales innervation
Posterior rami of spinal nerves
Interspinales Arterial supply
Deep cervical, intercostal, subcostal & lumbar A.
Interspinales Functions
Extension of spine
Intertransversarii Orign & insertion
Moves through C2-L5
Origin: transverse process of superior vertebrae.
Insertion: transverse process of inferior vertebrae.
Intertransversarii Innervation
Anterior rami of cervical spinal nerves (cervicis)
Posterior rami of thoracic and lumbar spinal nerves (thoracis & lumborum).
Intertransversarii arterial supply
Deep cervical, intercostal, subcostal & lumbar A.
Intertransversarii Function
Bilaterally stabilize spine, unilaterally laterally flexes the spine.
Levatores Costarum origin
Transverse processes of C7-T11.
Levatores costarum insertion
Subjacent ribs (breves) or rib 2 vertebrae below origin (longus)
Levatores costarum Arterial supply
Deep cervical, intercostal, subcostal & lumbar A.
Levatores costarum Function
Bilaterally elevates ribs. Ipsilaterally laterally flexes thoracic spine and contralaterally rotates it.
Suboccipital Triangle (muscles)
Rectus capitis posterior major: Medial border
Obliquus Capitis superior: Lateral border
Obliquus Capitis inferior: Inferior border
Contains the Vertebral & Suboccipital nerves.
Triangle of Auscultation
Trapezius: Medial Border
Medial border of scapulae: Lateral Border
Illiac Crest: Inferior Border
Lumbar Triangle
Latissimus Dorsi: Medial Border
External Oblique: Lateral Border
Illiac Crest: Inferior Border