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Muscles 111

Muscles, insertion, innervation, etc

Pectoralis Major Origin-Medial half of clavicle, sternum, and upper 6-7 costal cart Insertion-Later lip of intertubercular groove, humerus Action-Adduct, medially rotate and flex the arm nerves:Later and medial pectoral nerve from brachial plexus
deltopectoral groove holds the cephalic vein (a superficial vein with no accompanying artery)
Pectoralis minor Origin: 3rd, 4th, 5th ribs close to junction of costal cart Insertion: coracoid process of scapula Action: depress shoulder, protraction of scapula nerves:lateral and medial pectoral nerve from brachial plexus
subclavius origin: first rib insertion:subclavian groove on inferior side of clavicle action:stabilize clavicle and protect axillary vessels
serratus anterior origin:lateral, external surface of ribs 1-8 Insertion:medical border of scapula action:hold and rotate scapula against thoracic wall. protracts nerves:long thoracic nerve from brachial plexus
long Thoracic nerve innervates serratus anterior muscle on superficial side (injury results in winged scapula)
Trapezius Origin: Medial 1/3 of superior nuchal line, eop, nuchal ligament, spinal processes of C7-T12 Insertion: lateral 1/3 of clavicle, acromion and spine of scapula Main actions:elevates, depresses, and retracts scapula Nerve:cranial nerve XI (spinal accesso
Latissimus dorsi Origin: Spinous process of T6-T12, thoracolumbar fascia, iliac crest, and inf 3-4 ribs Insertion: Floor of intertubercular sulcus of humerus Action: extends, adducts, and medially rotates humerus Nerve: Thoracodorsal
Levator Scapulae Origin:Transverse processes of C1-C4 Insertion:Medial border of scapular superior to root of spine action:elevates scapula and slightly rotates nerve:dorsal scapular and C3/C4 cervical
Rhomboid major/minor Origin: Ma=spinous process of T2-T5 Mi=nuchal ligament/spinous process of C7/T1 Insertion: Ma=medical border of scapula Mi=medical end of scapular spine action: retract scapula and rotate (and fix to wall) Nerve: dorsal scapular
serratus posterior superior origin: nuchal ligament/spinous process of C7-T3 Insertion: superior borders of ribs 2-4 Action: elevates ribs nerve: 2-5th intercostal nerves
serratus posterior inferior origin:spinous processes of T11-L2 Insertion:inferior border of ribs 8-12 action:depress ribs nerve:9th-12th intercostal nerves
Splenius Origin:Nuchal ligament and spinous processes of upper thoracic vert insertion:occipital bone and trans processes of upper cervical vert action:Flexes and rotates head and neck/extends head and neck nerve:posterior primary rami of cervical spinal nerves
erector spinae (illiocostalis, longissimus, spinalis) Origin:arises by broad tendon from iliac crest insertion: I=rib and cervical trans proc L=ribs and trans proc in thor/cerv and cranium S=spin proc of upper thor Action:extend vertebral column and head/laterally flex nerve:posterior rami of spinal nerve
semispinalis Origin:transverse process of C4-T10 Insertion:spinous processes of vertebrae 4-6 and cranium action:extends and rotates head and vert column Nerve:post rami of spinal nerve
Multifidus Origin:sacrum, illium, trans processes insertion:spinous processes of vert 2-4 action: contralateral rotation nerve: posterior rami of spinal nerve
rotatores: origin:transverse processes insertion: spinour process of vert action:stabilizes vert nerve:posterior rami of spinal nerves
Created by: porter44



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