Lab Activity 11: Group II

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Lab Activity 11 Group II

• Muscles
• Martini Chapter 11

Portland Community College BI 231
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Origin and Insertion

• Origin The place where the fixed end attaches to
  a bone, cartilage, or connective tissue.
• Insertion The site where the movable end
  attaches to another structure.

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MUSCLES OF THE SHOULDER AND ARM
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Deltoid

• Origin Anterior surface, lateral clavicle,
  acromion process and spine of scapula
• Insertion Deltoid tubercle of humerus
• Action Abducts humerus aids in flexion,
  extension, and internal and external rotation

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Supraspinatus

• Origin Supraspinous fossa
• Insertion Greater tubercle of humerus
• Action Abducts humerus

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Infraspinatus

• Origin Infraspinous fossa
• Insertion Greater tubercle of humerus
• Action Rotates humerus laterally

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Teres Minor

• Origin Axillary border of scapula
• Insertion Greater tubercle of humerus
• Action Rotates humerus laterally

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Teres Major

• Origin Axillary border at inferior angle of
  scapula
• Insertion Intertubular groove of humerus
• Action Extends, adduction and medial rotates
  humerus.

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Subscapularis

• Origin Subscapular fossa
• Insertion Lesser tubercle of humerus
• Action Rotates humerus medially

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Biceps Brachii
Short Head

• Origin Long head, supraglenoid tubercleShort
  head, coracoid process scapula
• Insertion Radial tuberosity of the radius
• Action Flexes radius and humerus, and supinates
  forearm

Long Head
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Coracobrachialis

• Origin Coracoid process of scapula
• Insertion Middle third of humerus
• Action Flexes and adducts humerus

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Triceps Brachii
Long Head
Lateral Head

• Origin Long head, infraglenoid tubercle
  Lateral head, proximal portion of posterior
  humerus Medial head, distal half of posterior
  humerus
• Insertion Olecranon process of ulna
• Action Extends humerus and ulna

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Brachialis

• Origin Anterior distal two-thirds of humerus
• Insertion Coronoid process of ulna
• Action Flexes ulna

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Anconeus

• Origin Lateral epicondyle of humerus
• Insertion Olecranon process, posterior surface
  of ulna
• Action Weak extensor of ulna, stabilizes elbow
  joint in extension

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MUSCLES OF THE PALM
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Abductor Pollicis Brevis

• Origin Scaphoid and trapezium
• Insertion Proximal phalanx of thumb
• Action Abducts thumb and aids in flexion

Palm
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Flexor Pollicis Brevis

• Origin Trapezium
• Insertion Proximal phalanx of thumb
• Action Flexes thumb

Palm
Palm
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Flexor Digiti Minimi

• Origin Hook of hamate
• Insertion Proximal phalanx of fifth digit
• Action Flexes fifth digit

Palm
Palm
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Abductor Digiti Minimi

• Origin Pisiform and tendon of flexor carpi
  ulnaris
• Insertion Proximal phalanx of fifth digit
• Action Abducts fifth digit

Palm
Palm
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MUSCLES OF ANTERIOR FOREARM
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Pronator Teres

• Origin Medial epicondyle of humerus and coronoid
  process of ulna
• Insertion Middle portion of radius
• Action Pronates and flexes forearm

Anterior, Superficial Layer
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Flexor Carpi Radialis

• Origin Medial epicondyle of humerus
• Insertion Base of second metacarpal
• Action Flexes wrist and elbow and abducts wrist

Anterior, Superficial Layer
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Palmaris Longus

• Origin Medial epicondyle of the humerus
• Insertion Palmar aponeurosis
• Action Weak flexion of wrist, tenses skin of
  palm

Anterior, Superficial Layer
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Flexor Carpi Ulnaris

• Origin Medial epicondyle of humerus, olecranon
  process, posterior ulna
• Insertion Pisiform, hamate, and fifth metacarpal
  
• Action Flexes and adducts wrist

Anterior, Superficial Layer
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Flexor Digitorum Superficialis

• Origin Medial epicondyle of humerus and coronoid
  process of ulna
• Insertion Middle phalanges of fingers
• Action Flexes fingers and wrist

Anterior, Middle Layer
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Flexor Digitorum Profundus

• Origin Anterior and medial surfaces of ulna and
  interosseous membrane
• Insertion Distal phalanges of fingers
• Action Flexes fingers and wrist

Anterior, Deepest Layer
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Flexor Pollicis Longus

• Origin Middle half of radius, interosseous
  membrane, coronoid process of ulna
• Insertion Distal phalanx of thumb
• Action Flexes thumb and wrist

Anterior, Deepest Layer
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MUSCLES OF POSTEROLATERAL FOREARM
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Brachioradialis

• Origin Lateral supracondylar ridge
• Insertion Styloid process of radius
• Action Flexes forearm

Posterior, Superficial Layer
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Extensor Carpi Radialis Longus

• Origin Lateral supracondylar ridge of humerus
• Insertion Second metacarpal
• Action Extends and abducts hand

Posterior, Superficial Layer
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Extensor Carpi Radialis Brevis

• Origin Lateral epicondyle of humerus
• Insertion Third metacarpal
• Action Extends and abducts hand

Posterior, Superficial Layer
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Extensor Digitorum

• Origin Lateral epicondyle of humerus
• Insertion Into distal phalanx by 4 tendons
• Action Extends fingers and hand

Posterior, Superficial Layer
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Extensor Carpi Ulnaris

• Origin Lateral epicondyle of humerus and
  posterior border of ulna
• Insertion Fifth metacarpal
• Action Extends and adducts hand

Posterior, Superficial Layer
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Extensor Digiti Minimi

• Origin Lateral epicondyle of humerus
• Insertion Extensor expansion of little finger
• Action Extends 5th digit and hand

Posterior, Middle Layer
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Supinator

• Origin Lateral epicondyle of humerus, supinator
  crest of ulna
• Insertion Lateral surface and posterior border
  of radius
• Action Supinates forearm

Posterior, Deepest Layer
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Abductor Pollicis Longus

• Origin Posterior surface of ulna and radius, and
  interosseous membrane
• Insertion First metacarpal
• Action Abducts thumb and hand

Posterior, Deepest Layer
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Extensor Pollicis Brevis

• Origin Middle third of radius and interosseous
  membrane
• Insertion Base of proximal phalanx of thumb
• Action Extends thumb

Posterior, Deepest Layer
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Extensor Pollicis Longus

• Origin Middle third of ulna and interosseous
  membrane
• Insertion Base of distal phalanx of thumb
• Action Extends thumb

Posterior, Deepest Layer
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The End
The End