Muscles UL Flashcards by Irene Fetherston

Compartment, Action, Innervation

Pectoralis Minor

Compartment
Anterior Axioappendicular

Action
Protracts and depresses scapula

Innervation
Medial pectoral nerve (C8–T1)

Proximal Attachment
Ribs 3-5
Distal Attachment
Coracoid Process

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Compartment, Action, Innervation

Serratus Anterior

Compartment
Anterior Axioappendicular

Action
Agonist in scapula protraction; superiorly rotates scapula (so glenoid cavity moves superiorly); stabilizes scapula

Innervation
Long thoracic nerve (C5–C7)

Proximal Attachment
Ribs 1–8, anterior and superior margins
Distal Attachment
Scapula (medial border, anter. surface)

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Compartment, Action, Innervation

Subclavius

Compartment
Anterior Axioappendicular

Action
Depresses and stabilizes clavicle

Innervation
Nerve to subclavius (C5–C6)

Proximal Attachment
Rib 1
Distal Attachment
Clavicle (inferior surface)

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Compartment, Action, Innervation

Pectoralis Major

Compartment
Anterior Brachial

Action
Agonist of arm flexion; also adducts and medially rotates arm

**Innervation**
Lateral pectoral (C5–C7) and medial pectoral (C8–T1) nerves

Proximal Attachment
Clavicle, Ribs (costal cart. 2-6), Sternum
Distal Attachment
Humerus (lateral part of intertubercular groove)

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Compartment, Action, Innervation

Coracobrachialis

Compartment
Anterior Brachial

Action
Adducts and flexes arm

**Innervation**
Musculocutaneous nerve (C5–C6 nerve fibers)

Proximal Attachment
Coracoid Process
Distal Attachment
Humerus (medial shaft)

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Compartment, Action, Innervation

Biceps Brachii - Long head

Compartment
Anterior Brachial

Action
Flexes forearm, powerful supinator of forearm; Long head also flexes arm

**Innervation**
Musculocutaneous nerve (C5–C6 nerve fibers)

Proximal Attachment
Scapula (Supraglenoid Tubercle)
Distal Attachment
Radial Tuberosity, Bicipital Aponeurosis

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Compartment, Action, Innervation

Biceps Brachii - Short head

Compartment
Anterior Brachial

Action
Flexes forearm, powerful supinator of forearm

**Innervation**
Musculocutaneous nerve (C5–C6 nerve fibers)

Proximal Attachment
Coracoid Process
Distal Attachment
Radial Tuberosity, bicipital apon.

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Compartment, Action, Innervation

Brachialis

Compartment
Anterior Brachial

Action
Primary flexor of forearm

**Innervation**
Musculocutaneous nerve (C5–C6 nerve fibers)

Proximal Attachment
Humerus (distal anterior)
Distal Attachment
Ulna (tuberosity and coronoid proc.)

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Compartment, Action, Innervation

Flexor Pollicis Longus

Compartment
Anterior Deep Forearm

Action
Flexes MP joint of thumb, IP joint of thumb; weakly flexes wrist

**Innervation**
Median nerve (C6–C7 nerve fibers)

Proximal Attachment
Radius, Interosseous Membrane
Distal Attachment
Thumb (distal phalanx)

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Compartment, Action, Innervation

Flexor Digitorum Profundus

Compartment
Anterior Deep Forearm

Action
Flexes wrist; 2nd-5th MP joints, PIP joints, and DIP joints

Innervation
Lateral ½ of muscle innervated by median nerve (C6–C8 nerve fibers), medial ½ of muscle innervated by ulnar nerve (C8 nerve fibers)

Proximal Attachment
Ulna, Interosseous Membrane
Distal Attachment
Fingers 2-5 (distal phalanges)

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Compartment, Action, Innervation

Flexor Digitorum Superficialis

Compartment
Anterior Intermediate Forearm

Action
Flexes wrist; 2nd-5th MP joints and PIP joints

**Innervation**
Median nerve (C6–C7 nerve fibers)

Proximal Attachment
Medial Epicondyle, Coronoid Process
Distal Attachment
Fingers 2-5 (mid. phalanges)

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Compartment, Action, Innervation

Pronator Teres

Compartment
Anterior Superficial Forearm

Action
Pronates forearm

**Innervation**
Median nerve (C6–C7 nerve fibers)

Proximal Attachment
Medial Epicondyle, Coronoid Process
Distal Attachment
Radius (lateral surface)

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Compartment, Action, Innervation

Flexor Carpi Radialis

Compartment
Anterior Superficial Forearm

Action
Flexes wrist and abducts hand

**Innervation**
Median nerve (C6–C7 nerve fibers)

Proximal Attachment
Medial Epicondyle of humerus
Distal Attachment
Metacarpals II & III (base)

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Compartment, Action, Innervation

Palmaris Longus

Compartment
Anterior Superficial Forearm

Action
Weak wrist flexor

**Innervation**
Median nerve (C6–C7 nerve fibers)

Proximal Attachment
Medial Epicondyle of humerus
Distal Attachment
Flexor retinaculum, palmar aponeurosis

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Compartment, Action, Innervation

Flexor Carpi Ulnaris

Compartment
Anterior Superficial Forearm

Action
Flexes wrist and adducts hand

**Innervation**
Ulnar nerve (C8–T1)

Proximal Attachment
Medial Epicondyle of humerus, Olecranon, Ulna (posterior surface)
Distal Attachment
Pisiform, Hamate, Metacarpal V (base)

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Compartment, Action, Innervation

Levator Scapulae

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Levator Scapulae

Compartment
Posterior Axioappendicular

Action
Elevates scapula; inferiorly rotates scapula (pulls glenoid cavity inferiorly)

**Innervation**
Cervical nerves (C3–C4) and dorsal scapular nerve (C5)

Proximal Attachment
Cervical vertebrae
Distal Attachment
Scapula (medial border)

Compartment, Action, Innervation

Rhomboid Major

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Rhomboid Major

Compartment
Posterior Axioappendicular

Action
Elevates and retracts (adducts) scapula; inferiorly rotates scapula

Innervation
Dorsal scapular nerve (C5)

Proximal Attachment
Thoracic vertebrae
Distal Attachment
Scapula (medial border)

Compartment, Action, Innervation

Rhomboid Minor

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Rhomboid Minor

Compartment
Posterior Axioappendicular

Action
Elevates and retracts (adducts) scapula; inferiorly rotates scapula

Innervation
Dorsal scapular nerve (C5)

Proximal Attachment
Cervical vertebrae
Distal Attachment
Scapula (medial border)

Compartment, Action, Innervation

Trapezius

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Trapezius

Compartment
Posterior Axioappendicular

Action
Superior fibers: Elevate and superiorly rotate scapula Middle fibers: Retract scapula Inferior fibers: Depress scapula

**Innervation**
Accessory nerve (CN XI)

Proximal Attachment
Occipital bone, Ligamentum Nuchae, Cervical vertebrae
Distal Attachment
Clavicle, Acromial Process, Scapular Spine

Compartment, Action, Innervation

Latissimus Dorsi

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Latissimus Dorsi

Compartment
Posterior Axioappendicular

Action
Agonist of arm extension; also adducts and medially rotates arm (“swimmer’s muscle”)

**Innervation**
Thoracodorsal nerve (C6–C8)

Proximal Attachment
Thoracic vertebrae, Ribs, Ilium
Distal Attachment
Intertubercular Groove

Compartment, Action, Innervation

Triceps Brachii - Long head

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Triceps Brachii - Long head

Compartment
Posterior Brachial

Action
Primary extensor of forearm; Long head of triceps also extends and adducts arm

**Innervation**
Radial nerve (C5–C7 nerve fibers)

Proximal Attachment
Scapula (infraglenoid tubercle)
Distal Attachment
Olecranon

Compartment, Action, Innervation

Triceps Brachii - Lateral head

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Triceps Brachii - Lateral head

Compartment
Posterior Brachial

Action
Primary extensor of forearm

**Innervation**
Radial nerve (C5–C7 nerve fibers)

Proximal Attachment
Humerus (posterior, above radial groove)
Distal Attachment
Olecranon

Compartment, Action, Innervation

Triceps Brachii - Medial head

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Triceps Brachii - Medial head

Compartment
Posterior Brachial

Action
Primary extensor of forearm

**Innervation**
Radial nerve (C5–C7 nerve fibers)

Proximal Attachment
Humerus (posterior, below radial groove)
Distal Attachment
Olecranon

Compartment, Action, Innervation

Abductor Pollicis Longus

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Abductor Pollicis Longus

Compartment
Posterior Deep Forearm

Action
Abducts thumb; extends wrist (weakly)

**Innervation**
Radial nerve (C6–C8 nerve fibers)

Proximal Attachment
Radius & Ulna (proximal dorsal surface), interosseous membrane
Distal Attachment
Metacarpal I (lateral edge)

# Compartment, Action, Innervation Extensor Pollicis Brevis

Extensor Pollicis Brevis **Compartment** Posterior Deep Forearm **Action** Extends MP joint of thumb; extends wrist (weakly) ``` **Innervation** Radial nerve (C6–C8 nerve fibers) ``` **Proximal Attachment** Radius, Interosseous Membrane **Distal Attachment** Thumb (proximal phalanx)

# Compartment, Action, Innervation Extensor Pollicis Longus

Extensor Pollicis Longus **Compartment** Posterior Deep Forearm **Action** Extends MP and IP joints of thumb, extends wrist (weakly) ``` **Innervation** Radial nerve (C6–C8 nerve fibers) ``` **Proximal Attachment** Ulna, Interosseous Membrane **Distal Attachment** Thumb (distal phalanx)

# Compartment, Action, Innervation Extensor Indicis

Extensor Indicis **Compartment** Posterior Deep Forearm **Action** Extends MP PIP and DIP joints of finger 2; extends wrist (weakly) ``` **Innervation** Radial nerve (C6–C8 nerve fibers) ``` **Proximal Attachment** Ulna, Interosseous Membrane **Distal Attachment** Tendon of extensor digitorum

# Compartment, Action, Innervation Brachioradialis

Brachioradialis **Compartment** Posterior Superficial Forearm **Action** Flexes forearm ``` **Innervation** Radial nerve (C6–C7 nerve fibers) ``` **Proximal Attachment** Humerus (lateral supracondylar ridge) **Distal Attachment** Radius (Styloid Process)

# Compartment, Action, Innervation Extensor Carpi Radialis Longus

Extensor Carpi Radialis Longus **Compartment** Posterior Superficial Forearm **Action** Extends wrist, abducts hand ``` **Innervation** Radial nerve (C6–C7 nerve fibers) ``` **Proximal Attachment** Humerus (lateral supracondylar ridge) **Distal Attachment** Metacarpal II (base)

# Compartment, Action, Innervation Extensor Carpi Radialis Brevis

Extensor Carpi Radialis Brevis **Compartment** Posterior Superficial Forearm **Action** Extends wrist, abducts hand ``` **Innervation** Radial nerve (C6–C7 nerve fibers) ``` **Proximal Attachment** Lateral Epicondyle of humerus **Distal Attachment** Metacarpal III (base)

# Compartment, Action, Innervation Extensor Digitorum

Extensor Digitorum **Compartment** Posterior Superficial Forearm **Action** Extends wrist; extends 2nd-5th MP joints, PIP joints and DIP joints ``` **Innervation** Radial nerve (C6–C8 nerve fibers) ``` **Proximal Attachment** Lateral Epicondyle of humerus **Distal Attachment** Fingers 2-5 (D & M phalanges)

# Compartment, Action, Innervation Extensor Digiti Minimi

Extensor Digiti Minimi **Compartment** Posterior Superficial Forearm **Action** Extends MP and PIP joints of finger 5; extends wrist weakly ``` **Innervation** Radial nerve (C6–C8 nerve fibers) ``` **Proximal Attachment** Lateral Epicondyle of humerus **Distal Attachment** Finger 5 (proximal phalanx)

# Compartment, Action, Innervation Extensor Carpi Ulnaris

Extensor Carpi Ulnaris **Compartment** Posterior Superficial Forearm **Action** Extends wrist, adducts hand ``` **Innervation** Radial nerve (C6–C8 nerve fibers) ``` **Proximal Attachment** Lateral Epicondyle of humerus, Ulna (posterior border) **Distal Attachment** Metacrapal V (base)

# Compartment, Action, Innervation Deltoid

Deltoid **Compartment** Scapulohumeral **Action** Anterior fibers: Flex and medially rotate arm Middle fibers: Prime mover of arm abduction Posterior fibers: Extend and laterally rotate arm ``` **Innervation** Axillary nerve (C5–C6) ``` **Proximal Attachment** Clavicle (acromialial end), Scapula (acromial spine) **Distal Attachment** Deltoid Tuberosity

# Compartment, Action, Innervation Teres Major

Teres Major **Compartment** Scapulohumeral **Action** Extends, adducts, and medially rotates arm **Innervation** Lower subscapular nerve (C5–C6) **Proximal Attachment** Scapula (inferior lateral border, inferior angle) **Distal Attachment** Lesser Tubercle, Intertubercular Groove

# Compartment, Action, Innervation Subscapularis

Subscapularis **Compartment** Scapulohumeral **Action** Medially rotates arm **Innervation** Upper and lower subscapular nerves (C5–C6) **Proximal Attachment** Subscapular Fossa **Distal Attachment** Lesser Tubercle

# Compartment, Action, Innervation Supraspinatus

Supraspinatus **Compartment** Scapulohumeral **Action** Abducts arm ``` **Innervation** Suprascapular nerve (C5–C6) ``` **Proximal Attachment** Supraspinous fossa **Distal Attachment** Greater Tubercle

# Compartment, Action, Innervation Infraspinatus

Infraspinatus **Compartment** Scapulohumeral **Action** Adducts and laterally rotates arm ``` **Innervation** Suprascapular nerve (C5–C6) ``` **Proximal Attachment** Infraspinous fossa **Distal Attachment** Greater Tubercle

# Compartment, Action, Innervation Teres Minor

Teres Minor **Compartment** Scapulohumeral **Action** Adducts and laterally rotates arm ``` **Innervation** Axillary nerve (C5–C6) ``` **Proximal Attachment** Scapula (upper dorsal lateral border) **Distal Attachment** Greater Tubercle

Muscles UL Flashcards

(39 cards)