Muscle Of The Back Flashcards
Trapezius O I A N
O: Skull- external occipital protuberance Fascia-ligamentum nuchae Vertebrae-spines of C7/T1-12 I: Clavicle-lateral 1/3 Scapula-acromion and spine A: Both elevates (upper fibers) and depresses (lower fibers) shoulder/ retracts scapula and extends head N: accessory n cranial 11
Latisimus dorsi O I A N
O:
Vertebrae- spines of T6-12
Fascia- thoracolumbar fascia
Pelvic bone- iliac crest
I: humerous- intertubercular groove (bicipital)
A: Adduct, extends, and medially rotates arm
N: thoracodorsal nerve
Lavator scapulae O I A N
O: vertebrae- transverse process of C1-4
I: scapula- superior angle and medial border
A: elevated and Adduct scapula
N: dorsal scapular nerve
Rhomboid minor O I A N
O: vertebrae- spines of C7/T1
I: scapula-medial border
A: elevates and Adduct scapula
N: dorsal scapular nerve
Rhomboid major O I A N
O: vertebrae- spines of T2-5
I: scapula- medial border to inferior angle
A: elevates and Adduct scapula
N: dorsal scapular nerve
Thoracolumbar fascia
Definition and function
Covers the deep muscles of the back
Attaches medially to spines of vertebrae and inferiorly to the ilium
Cross fibers support body weight when you lift the opposite leg
Triangle of auscultation
Boundaries and clinical relavence
Medial: scapula
Lateral: rhomboid major
Superior: trapezius
Inferior: latisimus dorsi
Overlies the 6th intercostal space, the floor has no large muscles and is a good place for listening with a stethoscope
Levatores costarum O I A N
O: vertebrae- transverse processes of C7, T1-11
I: Ribs- inferior to origin
A: raise ribs in inspiration
N: dorsal rami of thoracic spinal nerves
Serratus posterior superior O I A N
O: vertebrae- spines and cervical and upper thoracic vertebrae
I: ribs
A: raise ribs in inspiration
N: intercostal nerves
Serratus posterior O I A N
O: vertebrae- spines of upper lumbar
I: ribs
A: lower ribs in expiration
N: intercostal nerves
Splenus O I A N
O: vertebrae- spines of T1-4
I: selenius capitis of skull- occipital and temporal bones
Splenius cervicis of vertebrae- transverse processes of C2-3
A: extend neck and head (rotate in unilateral action)
N: dorsal rami of spinal nerves
Erector Spinae 1. Iliocostalis*** 2. Lonngissimus 3. Spinalis O I A N
O: 1. Iliocostalis from ilium and ribs. I: 1. Iliocostas to ribs and transverse processes A: extend trunk and vertebral column N: dorsal rami of spinal nerves
Erector Spinae 1. Iliocostalis 2. Lonngissimus*** 3. Spinalis O I A N
O: longissimus from transverse process of vertebrae
I: longissimus to transverse process
A: extend vertebral column and trunk
N: dorsal rami of spinal nerves
Erector Spinae 1. Iliocostalis 2. Lonngissimus 3. Spinalis*** O I A N
O: spinalis from spinous process
I: spinalis to spinous process
A: extend trunk and vertebral column
N: dorsal rami of spinal nerves
Trasnversospinalis 1. Semispinalis 2. Multifidus 3. Rotatores O I A N
O: all take origin from transverse process of vertebrae
I: all insert upon spines of vertebrae superiorly to origin, but differ in how many vertebrae they extend across
1. Semispinalis extend across 5-6 vertebrae
2. Multifidus extend across 3-4 vertebrae
3. Rotatores extend across 1-2 vertebrae
A: all extend trunk in bilateral action and rotate vertebral column in unilateral action
N: dorsal rami of spinal nerves
