back muscles oian Flashcards
Trapezius ORIGIN
Skull - External occipital protuberance, Fascia - ligamentum nuchae, Vertebrae - spines of C7, T1-12
Trapezius INSERTION
Clavicle - lateral 1/3, acromion and spine of scapula
Trapezius ACTION
Both elevates (upper fibers) and depresses (lower fibers) shoulder; retracts scapula; also extends head
Trapezius NERVE
Accessory n. (Cranial nerve XI)
Latissimus dorsi ORIGIN
Vertebrae - spines of T6-T12 , Fascia - thoracolumbar fascia, Pelvic bone - iliac crest
Latissimus dorsi INSERTION
Humerus - Intertubercular (bicipital) groove
Latissimus dorsi ACTION
Adducts, extends, and medially rotates arm
Latissimus dorsi NERVE
Thoracodorsal n.
Levator scapulae ORIGIN
Vertebrae - transverse processes of C1-C4
Levator scapulae INSERTION
Scapula - superior angle and medial border
Levator scapulae ACTION
Elevates and adducts scapula
Levator scapulae NERVE
Dorsal scapular n.
Rhomboid minor ORIGIN
Vertebrae - spines of C7, T1
Rhomboid minor INSERTION
Scapula - Medial border
Rhomboid minor ACTION
Elevates and adducts scapula
Rhomboid minor NERVE
Dorsal scapular n.
Rhomboid major ORIGIN
Vertebrae - spines of T2-T5
Rhomboid major INSERTION
Scapula - Medial border to inferior angle
Rhomboid major ACTION
Elevates and adducts scapula
Rhomboid major NERVE
Dorsal scapular n.
Levatores costarum ORIGIN
Vertebrae - Transverse processes of C7, T1-11
Levatores costarum INSERTION
Ribs - inferior to origin
Levatores costarum ACTION
Raise ribs in inspiration
Levatores costarum NERVE
Dorsal rami of thoracic spinal nerves
Serratus posterior superior ORIGIN
Vertebrae - Spines of cervical and upper thoracic vertebrae
Serratus posterior superior INSERTION
Ribs
Serratus posterior superior ACTION
Raise ribs in inspiration
Serratus posterior superior NERVE
Intercostal nerves
Serratus posterior inferior ORIGIN
Vertebrae - Spines of upper lumbar and lower thoracic vertebrae
Serratus posterior inferior INSERTION
Ribs
Serratus posterior inferior ACTION
Lower ribs in expiration
Serratus posterior inferior NERVE
Intercostal nerves
Splenius ORIGIN
Vertebrae - Spines of T1-T4
Splenius INSERTION
Splenius Capitis to Skull - Occipital and temporal bones; Splenius Cervicis to Vertebrae - Transverse processes of C2-C3
Splenius ACTION
Extend neck and head (rotate in unilateral action)
Splenius NERVE
Dorsal rami of spinal nerves
Erector Spinae, 1) Iliocostalis, 2) Longissimus, 3) Spinalis ORIGIN
1) Iliocostalis from Ilium and ribs, 2) Longissimus from transverse processes of vertebrae, 3) Spinalis from spinous processes
Erector Spinae, 1) Iliocostalis, 2) Longissimus, 3) Spinalis INSERTION
1) Iliocostalis to ribs and trans procresses, 2) Longissimus to transverse processes of vertebrae, 3) 3) Spinalis to spinous processes
Erector Spinae, 1) Iliocostalis, 2) Longissimus, 3) Spinalis ACTION
Extend trunk and vertebral column
Erector Spinae, 1) Iliocostalis, 2) Longissimus, 3) Spinalis NERVE
Dorsal rami of spinal nerves
Transverso spinalis- 1) Semispinalis2) Multifidus, 3) Rotatores - ORIGIN
All take origin from transverse processes of vertebrae
Transverso spinalis- 1) Semispinalis2) Multifidus, 3) Rotatores - INSERTION
1) Semispinalis extend across 5 or 6 vertebrae, 2) Multifidus extend across 3 or 4 vertebrae, 3) Rotatores extend across 1 or 2 vertebrae
Transverso spinalis- 1) Semispinalis, 2) Multifidus, 3) Rotatores- ACTION
All extend trunk in bilateral action and rotate vertebral column in unilateral action
Transverso spinalis- 1) Semispinalis, 2) Multifidus, 3) Rotatores- Nerve
Dorsal rami of spinal nerves
