Back OINA(B) Flashcards
trapezius orgin
Superior nuchal line, external occipital protuberance, C1-C6 via ligamnetum nuchae, C7-T12 spinous process
trapezius insertion
spine of scapula, lateral third of clavicle, and acrominion process
trapezius action
superior fibers: elevate scapula and clavicle, middle fibers: retract and adduct scapula, inferior fibers: depress scapula and clavicle
trapezius nerve
spinal accessory nerve
trapezius blood supply
transverse cervical artery
latissimus dorsi orgin
Spinous process of T7-T12, L1-L5, sacrum, and posterior iliac crest via thoracolumbar fascia
latissimus dorsi insertion
floor of the bicipital groove of the humerus
latissimus dorsi action
extends, medially rotates, and adducts arm
latissimus dorsi innervation
thoracodorsal nerve
latissimus dorsi blood supply
thoracodorsal artery
levator scapulae orgin
C1-C4 transverse processes
levator scapulae insertion
superior border of scapula
levator scapulae action
elevates scapula, depresses lateral angle, helps pull scapula medially and superiorly, bend/flex the neck laterally and rotate to same side as acting muscle
levator scapulae nerve
dorsal scapular nerve
rhomboid major orgin
T2-T5 spinous processes
rhomboid major insertion
medial border of scapula
rhomboid major action
retracts the scapula, slightly elevates the scapula, and posteriorly rotates the scapula towards humerus
rhomboid major innervation
dorsal scapular nerve
rhomboid major blood supply
dorsal scapular artery
rhomboid minor orgin
C7-T1 spinous processes
rhomboid minor insertion
medial border of scapula
rhomboid minor action
retracts/adducts scapula, elevates, and roates scapula to direct the glenoid cavity inferiorly
rhomboid minor nerve
dorsal scapular nerve
serratus posterior superior orgin
Ligamentum nuchae, spinous processes of seventh cervical and first few thoracic vertebrae.
serratus posterior superior insertion
Superior borders of ribs 2-5, medial to their angles.
serratus posterior superior action
Assists in elevating/raising ribs in inspiration (slightly increasing the
diameter of thorax)
serratus posterior superior nerve
Ventral rami of first few thoracic nerves (T1-T4 intercostal nerves)
serratus posterior inferior orgin
Spinous processes of T11-T12 and L1-L3
serratus posterior inferior insertion
Inferior borders of ribs 9-12 near their angles.
serratus posterior inferior action
Pulls ribs slightly inferiorly, resisting the pull of the diaphragm
(preventing them from being pulled superiorly by the diaphragm);
depression of the ribs during forced expiration
serratus posterior inferior nerve
Ventral rami of last few thoracic nerves
Iliocostalis orgin
angles of ribs: 1-12
Iliocostalis cervicis insertion
Transverse processes of C4-C6
iliocostalis thoracics insertion
Angles of ribs 1-6 and transverse process of C7
iliocostalis lumborum insertion
Angles of ribs 7-12.
Iliocostalis cervicis action
Extension, lateral flexion of vertebral column
iliocostalis thoracic action
Extension, lateral flexion of vertebral column, rotates ribs
for forceful inspiration
iliocostalis lumborum action
Extension, lateral flexion of vertebral column, rotates ribs
for forceful inspiration.
Iliocostalis nerve
dorsal rami of spinal nerves
longissimus cervicis orgin
Transverse processes of T1-T5
longissimus thoracis orgin
Medial and lateral sacral crests, spinous processes of T11-
L5.
longissimuss capitis insertion
Posterior part of mastoid process of temporal bone
logissimus cervicis insertion
Transverse processes of C2-C6
longissimus thoracis insertion
Transverse processes of all thoracic vertebrae, and medial
aspects of most ribs (3-12).
longissimus capitis action
Extends and laterally flexes neck/head.
longissimus cervicis action
Extension, lateral flexion of vertebral column
longissimus thoracis action
Extension, lateral flexion of vertebral column, rotates ribs
for forceful inspiration
longissimus nerve
dorsal rami of spinal nerves
spinalis thoracis orgin
Spinous processes of T11-L2.
spinalis thoracis insertion
spinous process of T1-T8
spinalis action
Extends, laterally flexes and stabilizes vertebral column
spinalis nerve
dorsal rami of spinal nerves
rotatores orgin and insertion
- Span 1 or 2 vertebral segments
rotatores action
stabilize, extend (bilaterally) and rotate (contralaterally)
vertebral column
rotatores nerve
dorsal rami of spinal nerves
interspinales orgin and insertion
Paired on either side of the interspinous ligament,
unite spinous processes of adjacent vertebrae
interspinales action
Act to stabilize and
extend the vertebral column
interspinales nerve
dorsal rami of spinal nerves
intertransversarii orgin/insertion
- Unite transverse processes of adjacent vertebrae.
intertransversarii action
Unilaterally can produce slight lateral flexion of the vertebrae,
bilaterally help stabilize vertebral column
intertransversarii nerve
mostly innervated by ventral rami of cervical spine nerves but some are supplied by dorsal rami
semispinalis capitis orgin
Transverse processes of C4-C7 and T1-T7
semispinalis capitis insertion
Between superior and inferior nuchal lines of occipital bone
semispinalis capitis action
Extends neck/head and rotates head to opposite side
semispinalis nerve
dorsal rami of spinal nerves
semispinalis cervicis and thoracis action
extends and stabilizes vertebral column
multifdus orgin and insertion
Span 2 to 4 (“about 3”) vertebral segments
multifidus action
e stabilize, extend (bilaterally) and rotate (contralaterally) the
vertebral column
multifidus nerve
dorsal rami of spinal nerves
splenius capitis orgin
Inferior part of ligamentum nuchae, spinous processes of C7 and
T1-T4.
splenius capitis insertion
Mastoid process of the temporal bone and lateral part of the
superior nuchal line
splenius capitis action
Acting together (right and left) extend the neck/head, one side
acting alone will laterally flex and rotate head and neck ipsilateral (to
the same side as acting muscle)
splenius capitis nerve
Dorsal rami of spinal nerves
splenius cervicis orgin
Spinous processes of T3-T6
splenius cervicis insertion
Transverse processes of C1-C3
splenius cervicis action
Acting together (right and left) extend the neck, one side acting
alone will laterally flex and rotate neck; the head will follow
(ipsilateral)
splenius cervicis nerve
Dorsal rami of spinal nerves
