unit 2: back and posterior shoulder

what is the origin of the trapezius m.?

superior nuchal line, occipital protuberance, liamentum nuchae, spinous processes C7-T12

what is the insertion of the trapezius m.?

lateral 1/3 of clavicle, acromion, spine of scapula

what is the innervation of the trapezius m.?

CN XI

What is the action of the trapezius m. by section?

upper: elevate scapula, middle adduct scapula, lower depresses scapula

what is the origin of latissimus dorsi?

spinous process of T8-L5, sacrum, iliac crest, ribs 10-12

what is the insertion of latissimus dorsi?

floor of intertubercular sulcus

what is the action of latissimus dorsi m.?

humeral adduction, extension, internal rotation

what is the innervation of latissimus dorsi m.?

thoracodorsal n. (C6-C8)

what is the origin of levator scapulae m.?

posterior tubercles of transverse processes of C1-C4

what is the insertion of levator scapulae m.?

superior medial border of scapula

what is the action of levator scapulae m.?

elevate scapula

what is the innervation of levator scapula m.?

dorsal scapular n.

what is the origin of rhomboid major?

spinous process of T2-5

what is the origin for rhomboid minor?

spinous process C7-T1

What is the insertion of both rhomboid major/minor m.?

medial border of scapula

what is the action of rhomboid major/minor?

scapular retraction, elevation

what is the innervation of rhomboid major/minor m.?

dorsal scapular n.

what is the origin of both sections of serratus posterior?

superior: nuchal ligament, spinous process of C7-T3, inferior: spinous process of T11-L2

what is the insertion of serratus posterior?

superior: superior borders of ribs 2-4, inferior: inferior borders of ribs 8-12

what is the innervation of serratus posterior?

intercostal n.

what is the origin of the splenius capitis?

lower ½ of ligamentum nuchae, spinous process of C7-T4

What is the insertion of splenius capitis?

mastoid process, lateral 1/3 superior nuchal line

what is the action for both bilateral and unilateral fibers of splenius capitis?

B: capitis extension, U: ipsilateral rotation, lateral flexion

what innervates the splenius capitis m.?

dorsal rami of middle cervical nn.

what innervates the splenius cervicis m.?

dorsal rami of middle cervical nn.

What is the origin of splenius cervicis?

spinous process of T3-T6

what is the insertion of splenius cervicis?

transverse process of C1-C3

what is the action of both the unilateral and bilateral fibers of splenius cervicis?

B: capitis extension, U: ipsilateral rotation, lateral flexion

What is the origin of iliocostalis m.?

common broad tendon

what is the insertion of iliocostalis m.?

superior to lower rib angles, cervical transverse processes

what is the action of iliocostalis (bilateral + unilateral)?

B: extension U: lateral flexion

What is the origin of spinalis?

common broad tendon

what is the insertion of spinalis?

spinous process of thoracic/cervical regions, posterior cranium

what is the action of spinalis (bilateral + unilateral)?

B: extension U: lateral flexion

what is innervated by dorsal rami nn.?(6)

spinalis, iliocostalis, longissimus, semispinalis, multifidus, rotatores

what is the origin of longissimus m.?

common broad tendon

what is the insertion of longissimus?

superior to ribs, between tubercles/angles, transverse process in thoracic/cervical regions, mastoid process

what is the action of longissimus (bilateral/unilateral/capitis)?

B: extension, U: lateral flexion, C: ipsilateral capitis rotation

what is the origin of semispinalis?

transverse process of C4-T12

What is the origin of semispinalis (capitis/cervicis/thoracis)?

Capitis: occipital bone, Cervicis/Thoracis: spinous processes of superior vertebrae

what is the action of semispinalis (unilateral/bilateral)?

B: extension, U: contralateral rotation

what is the origin of deltoid m.?

lateral 1/3 of clavicle, acromion, spine of scapula

what is the insertion of deltoid m.?

deltoid tuberosity

what is the action of deltoid m.?

anterior: humeral flexion/IR, middle: humeral abduction, Posterior: humeral extension/ER

what is the innervation of deltoid m.?

axillary n. (C5-6)

What is the origin of supraspinatus m.?

supraspinous fossa

what is the insertion of supraspinatus m.?

superior facet of greater tubercle

what is the action of supraspinatus?

shoulder abduction initiation

What is innervated by the suprascapular n.?

supraspinatus, infraspinatus

What is the origin of infraspinatus?

infraspinous process

what is the insertion of infraspinatus?

middle facet of greater tubercle

what is the action of infraspinatus?

shoulder external rotation

what is the origin of teres minor?

middle lateral border of scapula

what is the insertion of teres minor?

inferior facet of greater tubercle

what is the action of teres minor?

shoulder external rotation

what innervates teres minor?

axillary n.

what is the origin of subscapularis m.?

subscapular fossa

what is the insertion of subscapularis?

lesser tubercle

what is the innervation of subscapularis?

upper/lower subscapular nn.

What is the origin of teres major?

inferior lateral border of scapula

what is the insertion of teres major?

medial lip of intertubecular sulcus

what is the action of teres major?

shoulder adduction, IR, weak extension

what is the innervation of teres major?

lower subscapular n.

what are the 4 muscles that make up the rotator cuff?

teres minor, supscapularis, infraspinatus, supraspinatus