MSK- Shoulder, arm, elbow

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Trapezius (superficial layer)

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chapter 15 & 16

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Trapezius (superficial layer)

Innervation: Accessory Nerve (CN XI)

Function:

  • Scapular elevation, depression, retraction

  • Rotate Glenoid cavity superiorly

<p>Innervation: <strong>Accessory Nerve (CN XI)</strong></p><p>Function:</p><ul><li><p><strong>Scapular elevation, depression, retraction</strong></p></li><li><p><strong>Rotate Glenoid cavity superiorly</strong></p><p></p></li></ul><p></p>
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Latissimus dorsi (superficial layer)

Innervation: Thoracodorsal N

Function:

  • Humerus extension, medial rotation, & adduction

<p>Innervation: <strong>Thoracodorsal N </strong></p><p>Function: </p><ul><li><p>Humerus <strong>extension, medial rotation, &amp; adduction</strong></p></li></ul><p></p>
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Rhomboids (superficial layer)

Innervation: Dorsal Scapular N

Function:

  • Scapular retraction

  • Rotate glenoid cavity inferiorly

<p>Innervation:<strong> Dorsal Scapular N</strong> </p><p>Function:</p><ul><li><p><strong>Scapular retraction</strong></p></li><li><p><strong>Rotate glenoid cavity inferiorly </strong></p></li></ul><p></p>
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Teres Major (superficial layer)

Innervation: Lower subscapular nerve (C5)

Function:

  • arm adduction & medial rotation

<p>Innervation: <strong>Lower subscapular nerve (C5)</strong></p><p>Function:</p><ul><li><p>arm <strong>adduction &amp; medial rotation</strong></p></li></ul><p></p>
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Supraspinatus (deep layer; rotator cuff)

Innervation: Suprascapular N

Function:

  • arm abduction (initiate & assist)

<p>Innervation: <strong>Suprascapular N </strong></p><p>Function:</p><ul><li><p><strong>arm abduction (initiate &amp; assist) </strong></p></li></ul><p></p>
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<p>Infraspinatus (deep layer; rotator cuff)</p>

Infraspinatus (deep layer; rotator cuff)

Innervation: Suprascapular N

Function:

  • laterally rotate arm

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Teres Minor (deep layer; rotator cuff)

Innervation: Axillary N

Function: laterally rotate arm

<p>Innervation: <strong>Axillary N</strong></p><p>Function:<strong> laterally rotate arm </strong></p><p></p>
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Subscapularis (Deep layer; rotator cuff)

Innervation: U/L Subscapularis Ns

Function: arm medial rotation

<p>Innervation: <strong>U/L Subscapularis Ns</strong></p><p>Function: <strong>arm medial rotation </strong></p>
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Pectorals: Pectoralis Major

Innervation: Lat./Med. Pectoral N

Function: Arm flexion + Adduction

<p>Innervation: <strong>Lat./Med. Pectoral N</strong></p><p>Function: <strong>Arm flexion + Adduction </strong></p>
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Pectorals: Pectoralis Minor

Innervation: Medial Pectoral N

Function: Scapular protraction + Stabilization

<p>Innervation: <strong>Medial Pectoral N</strong></p><p>Function: <strong>Scapular protraction + Stabilization </strong></p>
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<p>Pectorals: Serratus Anterior</p>

Pectorals: Serratus Anterior

Innervation: Long Thoracic N

Function: Protract + Stabilize scapula

(same as pec. minor)

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<p>Deltoid </p>

Deltoid

Innervation: Axillary N

Function: Arm Flexion, Extension, Abduction

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Biceps Brachii (arm flexors)

Innervation: Musculocutaneous N

Function: supination (tendon), minor flexion (aponeurosis)

short head: attaches to coracoid process

long head: attaches to humerus

<p>Innervation: <strong>Musculocutaneous N </strong></p><p>Function: <strong>supination (tendon), minor flexion (aponeurosis)</strong></p><p>short head: attaches to coracoid process </p><p>long head: attaches to humerus </p><p></p>
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Coracobrachialis (arm flexor)

Innervation: Musculocutaneous N

Function: arm flexion

note: deep to biceps brachii; attaches to coracoid process

<p>Innervation: <strong>Musculocutaneous N</strong></p><p>Function: <strong>arm flexion   </strong></p><p>note: deep to biceps brachii; attaches to coracoid process</p>
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Brachialis (arm flexor)

Innervation: Musculocutaneous N

Function: flex forearm (bottom arm part)

<p>Innervation: <strong>Musculocutaneous N</strong></p><p>Function: <strong>flex forearm (bottom arm part)</strong></p>
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Triceps (Arm extensors)

Innervation: Radial N

Function: arm extension (long head), forearm extension (both heads)

<p>Innervation: <strong>Radial N </strong></p><p>Function: <strong>arm extension (long head), forearm extension (both heads)</strong></p>
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<p>Bones of the elbow</p>

Bones of the elbow

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<p>Forearm Flexors (Superficial layer): Pronator Teres</p>

Forearm Flexors (Superficial layer): Pronator Teres

Innervation: Median N

Function: Pronation

<p>Innervation: <strong>Median N</strong></p><p>Function: <strong>Pronation </strong></p>
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<p>Forearm Flexors (Superficial layer): Flexor carpi radialis</p>

Forearm Flexors (Superficial layer): Flexor carpi radialis

Innervation: Median N

Function: Abduct (radial deviation) + Flex wrist

<p>Innervation: <strong>Median N</strong></p><p>Function: <strong>Abduct (radial deviation) + Flex wrist </strong></p>
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<p>Forearm Flexors (Superficial layer): Palmaris Longus</p>

Forearm Flexors (Superficial layer): Palmaris Longus

Innervation: Median N

Function: Tense Palmar Skin

<p>Innervation: <strong>Median N</strong></p><p>Function: <strong>Tense Palmar Skin </strong></p>
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<p>Forearm Flexors (Superficial layer): Flexor Carpi Ulnaris</p>

Forearm Flexors (Superficial layer): Flexor Carpi Ulnaris

Innervation: Ulnar N

Function: Adduct (ulnar deviation) & Flex Wrist

<p>Innervation: <strong>Ulnar N</strong></p><p>Function: <strong>Adduct (ulnar deviation) &amp; Flex Wrist</strong></p>
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<p>Forearm Flexors (Superficial layer): Brachioradialis </p>

Forearm Flexors (Superficial layer): Brachioradialis

Innervation: Radial N

Function: Flex elbow

<p>Innervation: <strong>Radial N </strong></p><p>Function: Flex elbow </p>
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<p>Forearm Flexors (middle layer): Flexor Digitorium Superficialis </p>

Forearm Flexors (middle layer): Flexor Digitorium Superficialis

Innervation: Median N

Function: PIP Flexion

<p>Innervation: <strong>Median N </strong></p><p>Function: <strong>PIP Flexion </strong></p>
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<p>Forearm Flexors (deep layer): Flexor Digitorium Profundus </p>

Forearm Flexors (deep layer): Flexor Digitorium Profundus

Innervation: Ulnar N

Function: DIP Flexion

<p>Innervation: <strong>Ulnar N</strong></p><p>Function: <strong>DIP Flexion </strong></p>
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<p>Forearm Flexors (deep layer): Pronator Quadratus </p>

Forearm Flexors (deep layer): Pronator Quadratus

Innervation: Median N

Function: forearm pronation

<p>Innervation: <strong>Median N </strong></p><p>Function: <strong>forearm pronation </strong></p>
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Forearm Extensors: Supinator

Innervation: Radial N

Function: supination

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Forearm Extensors: Extensor Carpi Radialis

Innervation: Radial N

Function: Abduct + Extend Wrist

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Forearm Extensors: Extensor Digitorium & Extensor Digiti Minimi

Innervation: Radial N

Function: Extend digits @MCP Joint

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<p>Forearm Extensors: Extensor Carpi Ulnaris </p>

Forearm Extensors: Extensor Carpi Ulnaris

Innervation: Radial N

Function: Adduct + Extend Wrist

<p>Innervation: <strong>Radial N </strong></p><p>Function: <strong>Adduct + Extend Wrist </strong></p>
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<p>Outcropping Muscles: Abductor Pollicis Longus </p>

Outcropping Muscles: Abductor Pollicis Longus

Innervation: Radial N

Function: Abduct thumb @ CMC

<p>Innervation: <strong>Radial N</strong></p><p>Function: <strong>Abduct thumb @ CMC</strong></p>
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<p>Outcropping Muscles: Extensor Pollicis Longus </p>

Outcropping Muscles: Extensor Pollicis Longus

Innervation: Radial N

Function: Extend @MCP, CMC, IP joints

<p>Innervation: <strong>Radial N</strong></p><p>Function: <strong>Extend @MCP, CMC, IP joints</strong></p>
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<p>Outcropping Muscles: Extensor Pollicis Brevis </p>

Outcropping Muscles: Extensor Pollicis Brevis

Innervation: Radial N

Function: Extend @ MCP + CMC joints

<p>Innervation: <strong>Radial N</strong></p><p>Function: <strong>Extend @ MCP + CMC joints</strong></p>
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<p>Outcropping Muscles: Extensor Indicis</p>

Outcropping Muscles: Extensor Indicis

Innervation: Radial N

Function: Extend 2nd Digit

<p>Innervation: <strong>Radial N</strong></p><p>Function: <strong>Extend 2nd Digit</strong></p>
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