MUSCLES STRX UNIT 1

Trapezius Origin

Medial third of superior nuchal line; external occipital protuberance; ligamentum nuchae ; spinous processes of C7-T12 vertebrae

Trapezius Insertion

lateral third of the clavicle, medial side of the acromion and the upper crest of the scapular spine

Trapezius Actions

superior fibers: elevates scapula

Trapezius Innervation

Motor: spinal Accesory (XI), Proprioception: C3-C4

Trapezius Artery

Transverse Cervical a.; Dorsal Scapular a.; posterior Intercostal a.

Latissimus Dorsi origin

Vertebral spines from T6-T-12, Thoracolumbar Fascia; Posterior Third of the iliac Crest, Lower 3 or 4 Ribs, Sometimes from the inferior angle of the Scapula

Latissimus Dorsi Insertion

Floor of the intertubercular Groove on the humerus

Latissimus Dorsi Actions

Extends, adducts, and medially rotates the arm

latissimus dorsi Innervation

Thoracodorsal nerve (C6,7, 8)

latissimus dorsi Artery

Thoracodorsal a., Dorsal perforating branches of the 9th, 10th, and 11th posterior intercostal, subcostal and first three arteries

Rhomboid major Origin

Spines of Vertebrae T2-T5

Rhomboid Major Insertion

Medial Border of the Scapula inferior the spine of the scapula

Rhomboid major Actions

Retracts Scapula and rotates Scapula Inferiorly

Rhomboid Major Innervation

Dorsal Scapular nerve (C4,C5)

Rhomboid Major Artery

Dorsal Scapular a.

Rhomboid Minor Origin

Inferior end of the ligamentum Nuchae, Spines of vertebrae C7 and T1

Rhomboid Minor Insertion

Medial Border of the Scapula at the root of the spine of the scapula

Rhomboid Minor Actions

Retracts Scapula and rotates the Scapula inferiorly

Rhomboid Minor Innervation

Dorsal Scapular nerve (C4,C5)

Rhomboid Minor Artery

Dorsal Scapular a.

Levator Scapulae Origin

Posterior Tubercles of C1-C4 Vertebra

Levator Scapulae Insertion

Medial Border of Scapula- spine to the superior angle

Levator Scapulae Actions

Elevates medial part of Scapula, which causes an inferior rotation of the glenoid cavity

Levator Scapulae Innervation

Dorsal Scapular Nerve (C4, C5); anterior primary rami of C3 & C4

Levator Scapulae Artery

Dorsal Scapular a.

Serratus Posterior Superior Origin

Nuchal Ligament, Spinous Process of C7-T3 Vertebrae

Serratus Posterior Superior insertion

Superior Borders of ribs 2-5

Serratus Posterior Superior actions

elevate ribs, proprioception

Serratus Posterior Superior Innervation

Anterior Primary Rami (First four intercostal nerves)

Serratus Posterior Superior Artery

Posterior intercostal a.

Serratus Posterior inferior origin

Spinous process of T11-L2 vertebra

Serratus Posterior Inferior Insertion

inferior borders of ribs 9-12

Serratus Posterior Inferior actions

depress ribs, proprioception

Serratus Posterior Inferior Innervation

Anterior Primary rami (Last four intercostal nerves)

Serratus Posterior Inferior Artery

Posterior Intercostal a.

Splenius Origin

ligamentum nuchae and spinous process of C7-T6

Splenius insertion

Capitis: mastoid process & superior nuchal line; cervicis: Posterior Tubercles of transverse Process of C1-C3

Splenius Actions

Bilateral contraction: Extends head and neck unilateral contraction: laterally flexes the neck and head, rotates head ipsilaterally

splenius innervation

Dorsal primary rami of Spinal nerves C2-C6

Splenius Artery

Occipital a., Deep Cervical Artery

Spinalis Origin

Iliac Crest, Sacrum, Spinous processes of lower lumbar vertebrae, and sacrum supraspinous ligament, sacrospinous ligament

spinalis insertion

Spinous processes of superior vertebral levels (thoracic & Midcervical) Cranium

Spinalis Action

Part of erector spinae group; Bilateral Contraction extends back and head; unilateral contraction laterally bends trunk and neck

Spinalis Innervation

Dorsal Primary Rami of Spinal Nerves

Spinalis Artery

Cervical; Occipital, Deep Cervical, Vertebral, Thoracic:posterior intercostal a. Abdominal: Subcostal, lumbar; Sacral: Lateral Sacral a.

Longissimus Origin

iliac crest, sacrum, spinous processes of lower lumbar vertebrae and sacrum, Supraspinous ligament, sacrospinous ligament

Longissimus insertion

Transverse process of superior vertebral levels (Thoracic and cervical) and mastoid process

Longissimus Actions

Part of erector Spinae group: bilateral contraction extends back and head; unilateral contraction laterally bends trunk and neck

longissimus innervation

Dorsal primary rami of spinal nerves

Longissimus Artery

Cervical: Occipital, deep cervical, vertebral, Thoracic: Posterior intercostal a; Abdominal: Subcostal, Lumbar; Sacral: Lateral sacral a.

Iliocostalis origin

Iliac crest, Sacrum, Spinous processes of lower lumbar vertebrae, sacrum, supraspinous ligament, sacrospinous ligament

Iliocostalis insertion

angles of the lower ribs, cervical transverse process

Iliocostalis actions

Part of the erector spinae group: Bilateral contraction extends back and head; unilateral contraction laterally bends trunk and neck

iliocostalis innervation

Dorsal primary rami of spinal nerves

Iliocostalis artery

Cervical: Occipital, deep cervical, vertebral, Thoracic: posterior intercostal a.; Abdominal: subcostal, lumbar; Sacral: Lateral; sacral: lateral sacral a.

Semispinalis Origin

transverse processes of C4- T12

Semispinalis Insertion

capitis: back of skull between nuchal lines; cervicis & thoracis: spines 4-6 vertebrae above origin

Semispinalis Actions

bilateral contraction extends the trunk, head and neck; unilateral contraction rotates the trunk and head to the opposite side

Semispinalis Nerves

dorsal primary rami of spinal nerves

Semispinalis Arteries

supplied segmentally:cervical : occipital, deep cervical a. and vertebral a., thoracic : posterior intercostal aa., subcostal a.,lumbar : lumbar aa.

Multifidis Origin

sacrum, ilium, transverse processes of T1-T12 and articular processes of C4-7

Multifidis insertion

spinous processes 2-4 vertebral levels superior to their origin

Multifidis Actions

bilateral contraction extends the trunk; unilateral contraction rotates the trunk to the opposite side, stabilizes spine

Multifidis Nerves

dorsal primary rami of spinal nerves

Multifidis arteries

supplied segmentally:cervical : occipital, deep cervical a. and vertebral a, thoracic : posterior intercostal aa., subcostal a., lumbar aa.lumbar : lateral sacral a.

Rotatores Origin

transverse processes

Rotatores Insertion

longus : spinous processes 2 vertebrae above origin; brevis : spinous processes 1 vertebrae above origin

Rotatores Actions

bilateral contraction: stablize and extend spine; unilaeral contraction: rotate the vertebral column contralaterally

Rotatores Nerves

dorsal primary rami of spinal nerves

Rotatores Arteries

supplied segmentally: cervical : deep cervical a., thoracic : posterior intercostal aa., subcostal a.,lumbar : lumbar aa.

Interspinales Origin

superiorborder of spinous process

Interspinales insertion

inferior border of spinous process above

Interspinales Actions

extend trunk and neck

Interspinales Nerves

dorsal primary rami of spinal nerves

Interspinales arteries

supplied segmentally:cervical : occipital, deep cervical a. and vertebral a, thoracic: posterior intercostal aa., subcostal a.,lumbar : lumbar aa.

Intertransversarii Origin

transverse processes of cervical and lumbar vertebrae

Intertransversarii Insertion

transverse processes of adjacent vertebrae

Intertransversarii Actions

bilateral contraction: stabilize the vertebral column; unilateral contraction: laterally flextrunk and neck

Intertransversarii Nerves

cervical parts - ventral and dorsal primary rami; thoracic parts: dorsal primary rami of spinal nerves;lumbar parts: ventral and dorsal primary rami

Intertransversarii Arteries

supplied segmentally:cervical: deep cervical a. thoracic: posterior intercostal a.; lumbar: lateral lumbar aa.

levatores costarum Origin

transverse processes C7- T11

Levatores Costarum insertion

subadjacent ribs between tubercle and angle of ribs

Levatores Costarum actions

elevates the ribs, assists with respiration

Levatores Costarum Nerves

dorsal primary rami of spinal nerves

Levatores Costarum Arteries

posterior intercostal a.

Obliquus capitis inferior Origin

spinous process of the axis

Obliquus Capitus inferior Insertion

transverse process of atlas

Obliquus Capitus Inferior Actions

rotates the head to the same side

Obliquus Capitus Inferior Nerve

suboccipital nerve (dorsal primary ramus of C1)

Obliquus Capitus Inferior Arteries

vertebral a., occipital a.

Obliquus Capitus Superior Origin

transverse process of atlas

Obliquus Capitis superior insertion

occipital bone above inferior nuchal line

Obliquus Capitis Superior Actions

extends and bends head laterally

Obliquus Capitis Superior Nerve

suboccipital nerve (dorsal primary ramus of C1)

Obliquus Capitis Superior Artery

vertebral a., occipital a.

Rectus Capitis Posterior Major Origin

spinous process of axis

Rectus Capitis Posterior Major Insertion

inferior nuchal line

Rectus Capitis Posterior Major Actions

extends the head, rotates the head to same side

Rectus Capitis Posterior Major Nerve

suboccipital nerve (dorsal primary ramus of C1)

Rectus Capitis Posterior Major Artery

vertebral a., occipital a.