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Ant/Post Thorax (Thorax)
(O)= origin, (I)= insertion, (N)= innervation, (A)= action
18
Anatomy
Undergraduate 4
09/28/2010

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Term
Trapezius
Definition
(O)- Occipital bone, ligamentum nuchae spines of C7-T12
(I)-Lateral 1/3 of clavicle (upper) acromion (middle) spine of scapula (lower fibers)
(N)-Spinal accessory nerve (cranial nerve XI)
(A)-(upper fibers) Elevates scapula
(middle fibers)- retract (adduct) scapula
(lower fibers)- lowers/pulls down scapula
(all fibers stabilize scapula)
Term
Levator Scapulae
Definition
(O)-Transverse process of C1-C4 vertebrae
(I)-superior vertebral border of scapula
(N)-dorsal scapular nerve
(A)-elevates scapula. when scapula is fixed it laterally flexes neck to the same side, acting together to extend the neck
Term
Rhomboids (Major + Minor)
Definition
(O)- (minor) spinous process of C7-T1
(major) T2-T5
(I)-(minor)root of spine of scapula
(major) medial borde of scapula below spine
(N)-dorsal scapular nerve
(A)-draws scapula medially, retracts scapula, rotates scapula downward
Term
Pectoralis Minor
Definition
(O)- Anterior surface of ribs 3-5
(I)-coracoid process of scapula
(N)- medial pectoral nerve
(A)-draws scapula down and forward, elevates ribs
Term
Serratus Anterior
Definition
(O)-Ribs 1-8 or 9
(I)-anterior surface of vertebral border of scapula
(N)-long thoraric nerve
(A)-holds scapula against chest wall, rotates scapula laterally, raises point of shoulder for arm abduction over 90degrees
Term
Subclavius
Definition
(O)-costal cartilage of 1st rib
(I)-inferior surface of clavicle (lateral 1/3)
(N)-nerve to subclavius
(A)-stabilizes pectoral girdle, depresses shoulder
Term
Sternocleidomastoid
Definition
(O)-sternal head- manubrium
clavicular head- medial 1/3 clavicle
(I)-mastoid process of temporal bone; lateral half of superior nuchal line
(N)- spinal accessory (cranial nerve XI)
(A)-bilaterally- flexes the neck
unilaterally- flexes head to the same side and turns face to opposite side
Term
Anterior Scalene
Definition
(O)-transverse processes of cervical vertebrae 4-6
(I)-first rib
(N)-cervical spinal nerves
(A)-flexes head- elevates first rib to aid in inspiration
Term
Anterior Scalene
Definition
(O)-transverse processes of cervical vertebrae 4-6
(I)-first rib
(N)-cervical spinal nerves
(A)-flexes head- elevates first rib to aid in inspiration
Term
Sternocleidomastoid
Definition
(O)-sternal head- manubrium
clavicular head- medial 1/3 clavicle
(I)-mastoid process of temporal bone; lateral half of superior nuchal line
(N)- spinal accessory (cranial nerve XI)
(A)-bilaterally- flexes the neck
unilaterally- flexes head to the same side and turns face to opposite side
Term
Subclavius
Definition
(O)-costal cartilage of 1st rib
(I)-inferior surface of clavicle (lateral 1/3)
(N)-nerve to subclavius
(A)-stabilizes pectoral girdle, depresses shoulder
Term
Serratus Anterior
Definition
(O)-Ribs 1-8 or 9
(I)-anterior surface of vertebral border of scapula
(N)-long thoraric nerve
(A)-holds scapula against chest wall, rotates scapula laterally, raises point of shoulder for arm abduction over 90degrees
Term
Elevators
Definition
trapezius
levator scapulae
Term
depressors
Definition
trapezius
serratus anterior
latissimus dorsi
pectoralis minor
subclavius
Term
protractors/abductors/forward lateral
Definition
serratus anterior
Term
retractors, adductors, backward medial
Definition
trapezius
rhomboids
Term
rotators [upward lateral]
Definition
trapezius
serratus anterior
Term
rotators [downward lateral]
Definition
pectoralis minor
rhomboids
levator scapulae
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