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Trapezius (Superficial Extrinsic Back Muscle)
Origin?
Insertion?
Action?
Innervation?
O- medial part of superior nuchal line, external occipital protuberance, nuchal ligament, spinous processes of C7-T12
I- Lateral end of clavicle, acromion/spine of scap
A- Descending part elevates scapula, ascending depresses scapula, middle retracts scapula, ascending/descending rotate glenoid cavity superiorly
I- Spinal accessory nerve (CN XI) + C2-C4 anterior rami
Latissimus Dorsi (Superficial Extrinsic Back Muscle)
Origin?
Insertion?
Action?
Innervation?
O- Spinous processes of last 6 thoracic vertebrae, thoracolumbarfascia, iliac crest, and last 3-4 ribs
I- Floor of intertubercular sulcus of humerus [bicipital groove] (front part between greater/lesser tubercles)
A- Extends, adducts, medially rotates humerus, raises body towards arm during climbing
I- Thoracodorsal nerve (C6-C8)
Levator Scapulae (Superficial Extrinsic Back Muscle)
Origin?
Insertion?
Action?
Innervation?
O- Posterior tubercle of transverse processes of C1-C4
I- Medial border of scap above scap spine
A- elevate scap, rotates glenoid cavity inferiorly
I- Dorsal scapular (C4/C5) cervical nerve (C3/C4)
Rhomboid Major (Superficial Extrinsic Back Muscles)
Origin?
Insertion?
Action?
Innervation?
O- Spinous process T2-T5
I- medial end of scap from scap spine to inferior angle
A- Retract scap, rotate glenoid cavity inferior, fix scap to thoracic wall (same as minor)
I- Dorsal scapular nerve (C4/C5) ( same as Minor)
Rhomboid Minor (Superficial Extrinsic Back Muscles)
Origin?
Insertion?
Action?
Innervation?
O- Nuchal lig, spinous process of C7/T1
I- medial area of scap spine
A- Retracts scap, rotates glenoid cavity inferiorly, fixes scap to thoracic wall (Same as Major)
I- Dorsal scapular nerve (C4/C5) (Same a Major)
Serratus Posterior Superior (Intermediate Extrinsic Back Muscle)
Origin?
Insertion?
Action?
Innervation?
O- spinous processes of C6 to T3, including supraspinous ligaments and ligamentum nuchae
I- posterior surfaces of ribs 2 to 5, near their angles
A- Proprioceptive
I- Intercostal Nerves
Serratus Posterior Inferior (Intermediate Extrinsic Back Muscle)
Origin?
Insertion?
Action?
Innervation?
O- spinous processes and supraspinous ligaments of T11 to L3
I- posterior surfaces of ribs 9 to 12, near their angles
A- Proprioceptive
I- Intercostal Nerves
Splenius Cervicis (Intrinsic Back Muscle (Superficial)/lateral vertebral muscle)
Origin?
Insertion?
Action?
Innervation?
O- nuchal ligament and spinous process of C7-T6 ( Same as Capitis)
I- Tubercles of transverse process of C1-C4
A- Unilateral= ipsilateral lateral flexion/rotation
Biilateral= extension of head/neck. Maintain posture, help control vertebral column (Same as Capitis)
I- dorsal rami of spinal n roots of C2-C8 (Same as Capitis)
Splenius Capitis (Intrinsic Back Muscle(Superficial))
Origin?
Insertion?
Action?
Innervation?
O- nuchal ligament and spinous process of C7-T6 ( Same as Cervicis)
I- superolaterally to mastoid process and superior nuchal line
A- Unilateral= ipsilateral lateral flexion/rotation
Biilateral= extension of head/neck. Maintain posture, help control vertebral column (Same as Cervicis)
I- dorsal rami of spinal n roots of C2-C8 (Same as Cervicis)
Iliocostalis (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]
Origin?
Insertion?
Action?
Innervation?
O- broad tendon of iliac crest, posterior surface of sacrum, sacro-iliac ligs, sacral and inferior lumbar spinous processes, supraspinous lig
I- superior to angles of lower ribs and cervical processes(Only difference from Longissimus and Spinalis)
A- Anteriorly tilt pelvis, extending spine, laterally flex spine
I- dorsal rami of adjacent spinal nerve roots (C3–L5)
Longissimus (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]
Origin?
Insertion?
Action?
Innervation?
O- broad tendon of iliac crest, posterior surface of sacrum, sacro-iliac ligs, sacral and inferior lumbar spinous processes, supraspinous lig
I- superior to ribs between tubercles and angles to transverse processes in thoracic and cervical regions, to mastoid process in temporal bone (Only difference from Iliocostalis and Spinalis)
A- Anteriorly tilt pelvis, extending spine, laterally flex spine
I- dorsal rami of adjacent spinal nerve roots (C3–L5)
Spinalis (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]
Origin?
Insertion?
Action?
Innervation?
O- broad tendon of iliac crest, posterior surface of sacrum, sacro-iliac ligs, sacral and inferior lumbar spinous processes, supraspinous lig
I- superior to spinous processes in thorac to cranium (Only difference from Iliocostalis and Longissimus)
A- Anteriorly tilt pelvis, extending spine, laterally flex spine
I- dorsal rami of adjacent spinal nerve roots (C3–L5)
Semispinalis(Capitis, Cervicis, and Thoracis) (Intrinsic Back Deep Muscle) [Suboccipital TRIANGLE Structure] [Roof]
Origin?
Insertion?
Action?
Innervation?
O- transverse processes of C4-T12
I- superomedially to occipital bone, spinous process of thoracic/cervical vertebrae,
A- Extension and contralateral rotation of head, cervical, and thoracic regions
I- C1-T6 (dorsal rami)
Multifidus (Intrinsic Back Muscle(Deep))
Origin?
Insertion?
Action?
Innervation?
O- posterior sacrum, posterior superior iliac spine, erector spinae aponeurosis, sacro-iliiac ligs, mammillary processes of lumbar vertebrae, tranverse processes of T1-T3, articular process C4-C7
I- entire length of spinous processes
A- stabalize during walking
I- posterior rami of C3-C7
Rectus Capitis Posterior Major (Intrinsic Back Deep Muscle) [Subocciptal TRIANGLE muscles Superomedial Boundary]
Origin?
Insertion?
Action?
Innervation?
O- Spinous process C2
I- Lateral part of inferior nuchal line of occipital bone
A- Extend neck, lateral flex, rotate neck
I- suboccipital nerve (posterior rami of C1) (Same as Minor and Obliquus capitis inferior/superior)
Rectus Capitis Posterior Minor (Intrinsic Back Deep Muscle) [Suboccipital Muscles]
Origin?
Insertion?
Action?
Innervation?
O- posterior tubercle of posterior arch of C1
I- Inferior nuchal line
A- Extend neck
I- suboccipital nerve (posterior rami of C1) (Same as Major and Obliquus capitis inferior/superior)
Obliquus Capitis Inferior (Intrinsic Back Deep Muscle) [Suboccipital TRIANGLE Muscles Inferolateral Boundary]
Origin?
Insertion?
Action?
Innervation?
O- Spinous process C2
I- Transverse process C1
A- Extend/Rotate neck
I- Suboccipital nerve (posterior rami of C1) (Same as Superior and Rectus capitis major/minor)
Obliquus Capitis Superior (Intrinsic Back Deep Muscle) [Suboccipital Muscles Superolateral Boundary]
Origin?
Insertion?
Action?
Innervation?
O- Transverse process C2
I- Occipital bone between both nuchal lines
A- Extend neck, lateral flex
I- Suboccipital nerve (Posterior rami of C1) (Same as Inferior and Rectus Capitis posterior major/minor)
Sternocleidomastoid
Origin?
Insertion?
Action?
Innervation?
O- Manubrium, clavicular head, posterior surface of medial first part of clavicle
I- Mastoid process and superior nuchal line of occiptal bone
A- Unilateral= lateral flexion, contralateral rotation
Bilateral= flexes neck down to sternum, and also flexes/protudes chin while extending neck slightly (lying down)
I- Spinal accessory nerve (CN XI)
Deltoid
Origin?
Insertion?
Action?
Innervation?
O- lateral third of clavcle, acromion and spine of scap
I- deltoid tuberosity of humerous
A- anterior: flex/medially rotate arm middle/acromial: abducts, posterior: extends/laterally rotates arm
I- Axillary n. (C5, C6)
Supraspinatus
Origin?
Insertion?
Action?
Innervation?
O- Supraspinous fossa of scap
I- Superior facet of greater tubercle of humerus
A- Helps deltoid abduct arm, helps rotator cuff
I- Suprascapular n. (C5, C6)
Infraspinatus
Origin?
Insertion?
Action?
Innervation?
O- Infraspinous fossa of scap
I- Middle facet of greater tubercle of humerus
A- Lateral rotates arm, helps rotator cuff
I- Suprascapular n. (C5, C6)
Teres Minor
Origin?
Insertion?
Action?
Innervation?
O- Middle part of lateral border of scap
I- Inferior facet of greater tubercle of humerus
A- Lateral rotates arm, helps rotator cuff
I- Axillary n. (C5, C6)
Teres Major
Origin?
Insertion?
Action?
Innervation?
O- Posterior surface of inferior angle of scap
I- Medical lip of intertubercular sulcus of humerus
A- adducts, medially rotates arm
I- Lower subscapular n. (C5-C7)
Subscapularis
Origin?
Insertion?
Action?
Innervation?
O- Subscapular fossa
I- Lesser tubercle of humerus
A- Medially rotates arm
I- Upper and lower subscapular n. (C5-C7)
Serratus anterior (Deep to Subscap)
Origin?
Insertion?
Action?
Innervation?
O- External surface of lateral parts of 1-8 ribs
I- Anterior surface of medial border of scap
A- Protracts and rotates scap
I- Long thoracic n.